JP2011065719A - Head slider and magnetic disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head slider that prevents a recording element from being damaged, and a magnetic disk device. <P>SOLUTION: In a magnetic disk device, an end face of a recording element and an end face of a collision detecting element are formed within a medium facing surface of a head slider, the end face of a collision detecting element extends to the inner peripheral side more than the end face of the recording element when the head slider is positioned at the most inner periphery of a rotation range, and/or, the end face extends to the outer peripheral side more than the end face of the recording element when the head slider is positioned at the most outer periphery of a rotation range. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a head slider and a magnetic disk device, and more particularly to a technique for detecting a collision between a head slider and a disk medium.

  In a magnetic disk device, data is read and written by a recording element and a reproducing element included in a head slider that floats on a disk medium. In recent years, the flying height of the head slider has been reduced to 10 nm or less, and collision between the head slider and the disk medium has been a problem.

  Patent Document 1 discloses a method of detecting a collision between a head slider and a disk medium by monitoring an output signal of a reproducing element composed of a magnetoresistive element.

JP 2007-250170 A

  However, in the above prior art, before the collision is detected, a minute defect existing on the surface of the disk medium may directly collide with the recording element provided on the head slider and damage the recording element. .

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a head slider and a magnetic disk device capable of suppressing damage to a recording element.

  In order to solve the above-described problems, a magnetic disk device according to the present invention has a disk medium, a first actuator that rotates the disk medium, a head slider that floats on the disk medium, and an outer side of the disk medium. A second actuator for turning the head slider between an inner periphery and an outer periphery of the disk medium around the turning axis, and the head slider includes a recording element for writing data to the disk medium; A collision detection element that detects a collision with the disk medium, and an end surface of the recording element that emits a recording magnetic field in a medium facing surface of the head slider that faces the disk medium, and an end surface of the collision detection element And when the head slider is positioned at the innermost periphery of the turning range, the inner peripheral end of the end face of the collision detection element is When the head slider is located on the outermost periphery of the turning range, the end on the outer peripheral side of the end surface of the collision detecting element is projected to the inner peripheral side from the inner peripheral end of the recording element end surface. Further, the recording element is characterized by projecting to the outer peripheral side from the outer peripheral end of the end face of the recording element.

  In one aspect of the present invention, the head slider includes a reproducing element for reading data from the disk medium, and an end surface of the reproducing element is formed in the medium facing surface, and the head slider is at the end of the turning range. When located on the inner periphery, the inner peripheral end of the end face of the collision detection element is on the inner peripheral side of the inner peripheral end of the end face of the recording element and the inner peripheral end of the end face of the reproducing element. And / or when the head slider is located on the outermost periphery of the turning range, the outer peripheral end of the end face of the collision detecting element is the outer end of the end face of the recording element and the end of the reproducing element. Projects to the outer peripheral side rather than the outer peripheral end of the end face.

  In the aspect of the invention, the head slider includes a reproducing element that reads data from the disk medium, and a second collision detection element that detects a collision with the disk medium, In addition, an end face of the reproducing element and an end face of the second collision detection element are formed, and the end face of the second collision detection element is formed when the head slider is positioned at the innermost periphery of the turning range. The end on the inner peripheral side of the end face of the collision detection element 2 projects to the inner peripheral side from the end on the inner peripheral side of the end face of the reproducing element, and / or the head slider is located on the outermost periphery of the turning range. Sometimes, the end on the outer peripheral side of the end face of the second collision detection element protrudes more outward than the end on the outer peripheral side of the end face of the reproducing element.

In the above aspect, the end on the inner peripheral side in the slider width direction of the end surface of the collision detection element is on the inner peripheral side in the slider width direction compared to the end on the inner peripheral side in the slider width direction on the end surface of the recording element. overhang than L _w tan .theta _i to, and / or, the outer circumferential end of the slider width direction of the end surface of the collision detection device is a slider width as compared to the slider width direction of the outer peripheral end of the end surface of the recording element it may be overhang than the _L w _{tanθ o} on the outer peripheral side of the direction. However, _Lw is the distance along the slider longitudinal direction between the end face of the recording element and the end face of the collision detection element, and θ _i is when the head slider is located at the innermost circumference of the turning range. The angle formed by the slider longitudinal direction and the rotation direction of the disk medium, and θ _o is the angle formed by the slider longitudinal direction and the disk medium rotation direction when the head slider is located at the outermost periphery of the turning range. It is.

In the above aspect, the end face of the recording element is positioned on the outer peripheral side in the slider width direction with respect to the end face of the reproducing element, and the end on the inner peripheral side in the slider width direction of the end face of the collision detecting element is Compared to the end on the inner peripheral side in the slider width direction of the end face of the element, it projects beyond L _r tanθ _i on the inner peripheral side in the slider width direction, and / or the outer peripheral side in the slider width direction of the end face of the collision detection element The end of the recording element may protrude beyond L _w tan θ _o on the outer peripheral side in the slider width direction as compared with the outer peripheral end in the slider width direction of the end face of the recording element. However, L _w is the distance along the slider longitudinal direction between the end surface and the end surface of the collision detection device of the recording element, L _r, the slider longitudinal between the end face and the end face of the collision detection device of the read element Is the distance along the direction, θ _i is the angle formed by the longitudinal direction of the slider and the rotation direction of the disk medium when the head slider is located at the innermost circumference of the turning range, and θ _o is the angle This is the angle formed by the longitudinal direction of the slider and the rotational direction of the disk medium when the head slider is positioned on the outermost periphery of the turning range.

In the above aspect, the end face of the recording element is located on the inner peripheral side in the slider width direction with respect to the end face of the reproducing element, and the end on the inner peripheral side in the slider width direction of the end face of the collision detecting element is Compared to the end on the inner peripheral side in the slider width direction of the end face of the recording element, it projects beyond L _w tanθ _i on the inner peripheral side in the slider width direction and / or the outer periphery in the slider width direction on the end face of the collision detection element The end on the side may project beyond L _r tanθ _o on the outer peripheral side in the slider width direction as compared with the outer peripheral end in the slider width direction of the end face of the reproducing element. However, L _w is the distance along the slider longitudinal direction between the end surface and the end surface of the collision detection device of the recording element, L _r, the slider longitudinal between the end face and the end face of the collision detection device of the read element Is the distance along the direction, θ _i is the angle formed by the longitudinal direction of the slider and the rotation direction of the disk medium when the head slider is located at the innermost circumference of the turning range, and θ _o is the angle This is the angle formed by the longitudinal direction of the slider and the rotational direction of the disk medium when the head slider is positioned on the outermost periphery of the turning range.

In the above aspect, the end on the inner peripheral side in the slider width direction of the end surface of the second collision detection element is closer to the end in the slider width direction than the end on the inner peripheral side in the slider width direction of the end surface of the reproducing element. The end of the second collision detection element extends beyond the inner circumference side from L _r tanθ _i , and the outer end in the slider width direction of the end face of the second collision detection element is the outer end of the end face of the reproducing element in the slider width direction. it may overhang than L _r tan .theta _o on the outer peripheral side of the lateral direction of the slider compared to. Where L _r is the distance along the slider longitudinal direction between the end face of the reproducing element and the end face of the second collision detection element, and θ _i is the innermost circumference of the turning range of the head slider. Is the angle formed by the longitudinal direction of the slider and the rotational direction of the disk medium, and θ _o is the longitudinal direction of the slider and the rotational direction of the disk medium when the head slider is located at the outermost periphery of the turning range. It is the angle that makes.

  In the aspect of the invention, the collision detection element may include a plurality of element units capable of detecting a collision with the disk medium, and end surfaces of the plurality of element units may have a slider width within the medium facing surface. They are formed at different positions in the direction.

In one aspect of the present invention, the recording element has a main pole that extends to the medium facing surface and emits a recording magnetic field from the end face, and the end face of the main pole has an end face on the leading side rather than the trailing side. The end of the collision detection element has an inclined side close to the center in the slider width direction, and one end in the slider width direction of the end face of the collision detection element is compared with one end in the slider width direction of the end face of the main pole. One end in the slider width direction extends beyond L _w tan α, and / or the other end in the slider width direction of the end face of the collision detection element is compared with the other end in the slider width direction of the end face of the main pole Then, it projects beyond L _w tan α in the other direction of the slider width. However, _Lw is the distance along the slider longitudinal direction between the end face of the main pole and the end face of the collision detection element, and α is the inclination angle of the inclined side with respect to the slider longitudinal direction.

  In one aspect of the present invention, the head slider includes a reproducing element that reads data from the disk medium, and a part of the medium facing surface that includes the end face of the recording element and the end face of the reproducing element, A projecting adjustment element that projects toward the disk medium, and an end face of the reproducing element is formed in the medium facing surface, and an end face of the collision detecting element is an end face of the recording element and an end face of the reproducing element Located between.

  The head slider of the present invention is a head slider that floats on a rotating disk medium, a recording element that writes data to the disk medium, a reproducing element that reads data from the disk medium, and the head slider. Of the medium facing surface facing the disk medium, a collision between the disk medium and a protrusion adjusting element for projecting a part including the end surface of the recording element and the end surface of the reproducing element toward the disk medium is detected. The collision detection element includes a collision detection element having an end surface positioned between the end surface of the recording element and the end surface of the reproducing element.

The head slider of the present invention is a head slider that floats on a rotating disk medium, and has a main magnetic pole that extends to a medium facing surface that faces the disk medium of the head slider and generates a recording magnetic field from its end surface. A recording element and a collision detection element for detecting a collision with the disk medium, and the end face of the main pole has an inclined side closer to the center of the end face in the slider width direction of the end face than the trailing side. Then, one end in the slider width direction of the end face of the collision detection element protrudes beyond one end in the slider width direction to L _w tan α compared to one end in the slider width direction of the end face of the main pole, And / or the end on the other side in the slider width direction of the end face of the collision detection element is in the slider width direction compared to the other end in the slider width direction of the end face of the main pole. It is characterized by projecting beyond L _w tan α to the other of the above. However, _Lw is the distance along the slider longitudinal direction between the end face of the main pole and the end face of the collision detection element, and α is the inclination angle of the inclined side with respect to the slider longitudinal direction.

In the above aspect, the head slider includes a reproducing element that reads data from the disk medium, and the end face of the main pole is one of the end faces of the reproducing element formed on the medium facing surface in the slider width direction. One end in the slider width direction of the end face of the collision detection element is positioned on one side in the slider width direction compared to one end in the slider width direction of the end face of the main pole from L _w tanα. even overhang, and / or the other end of the slider width direction of the end surface of the collision detection device, said the end face width direction of the slider of the other side end other lateral direction of the slider compared to the regeneration element L _r You may overhang from tanα. Here, _Lr is a distance along the longitudinal direction of the slider between the end face of the reproducing element and the end face of the collision detecting element.

Further, in the above aspect, the head slider includes a reproducing element that reads data from the disk medium, and a second collision detection element that detects a collision with the disk medium, and in the medium facing surface, An end face of the reproducing element and an end face of the second collision detecting element are formed, and one end of the end face of the second collision detecting element in the slider width direction is one side of the end face of the reproducing element in the slider width direction. overhang than L _r tan [alpha to one of the lateral direction of the slider as compared to the end, and / or, wherein the ends of the other side of the slider width direction of the end face of the second collision sensing element, the slider of the end face of the read element Compared with the other end in the width direction, the other end in the slider width direction may protrude beyond L _r tanα. Here, _Lr is a distance along the longitudinal direction of the slider between the end face of the reproducing element and the end face of the collision detecting element.

  According to the present invention, since the end face of the collision detecting element for detecting the collision with the disk medium is configured to protrude as described above, before the minute defect existing on the surface of the disk medium directly collides with the recording element. In addition, it is possible to avoid the collision by grasping the presence of such minute defects.

1 is a perspective view of a magnetic disk device according to an embodiment of the present invention. It is sectional drawing of the head slider which concerns on one Embodiment of this invention. It is a figure showing the medium opposing surface of the head slider which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIG. 3A. It is a schematic diagram explaining the effect of this invention. It is a schematic diagram explaining the effect of this invention. It is a schematic diagram explaining the effect of this invention. It is a figure explaining the effect of this invention. It is a figure explaining the effect of this invention. 3 is a flowchart showing an operation example of the magnetic disk device according to the embodiment of the present invention. It is a figure showing the medium opposing surface of the head slider which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIG. 7A. It is a figure showing the medium opposing surface of the head slider which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIG. 8A. It is a figure showing the medium opposing surface of the head slider which concerns on one Embodiment of this invention.

  Embodiments of a head slider and a magnetic disk apparatus of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of the magnetic disk device 1. In the figure, the illustration of the top cover is omitted. The magnetic disk device 1 includes a disk medium 2, a head slider 3, a suspension 4 that holds the head slider 3, an arm 5 that holds the suspension 4, and a voice coil motor that drives the arm 5 and positions the head slider 3. 6 (second actuator), a spindle motor 7 (first actuator) that rotates the disk medium 2, and a base 8 that accommodates these components. The head slider 3 floats on the rotating disk medium 2 and reads / writes data magnetically by the wedge film effect of air as an air-lubricated bearing. The voice coil motor 6 is configured to be able to turn around a turning axis defined outside the disk medium 2, and the head slider 3 has a substantially radius between an inner peripheral position and an outer peripheral position on the disk medium 2. Turn in the direction. A range in which the head slider 3 turns on the disk medium 2 in this way is defined as a turning range PR. FIG. 1 shows a load / unload type magnetic disk apparatus 1 having a ramp mechanism 9 for retracting the head slider 3 when the disk medium 2 is stopped. May be a contact start / stop (CSS) type magnetic disk device.

  FIG. 2 is a cross-sectional view of the head slider 3. In the drawing, a cross-sectional structure in the vicinity of the outflow end when the head slider 3 is cut at the center in the slider width direction is schematically shown. In the drawing, TR and LD represent the outflow end side (trailing side) and the inflow end side (leading side) of the head slider 3. The head slider 3 includes a rectangular parallelepiped slider substrate portion 12 made of a sintered body (so-called Altic) of alumina and titanium carbide, and a thin film formed on the end surface on the outflow end side of the slider substrate portion 12 and having alumina as a base material. And a head portion 13. The thin film head portion 13 includes a reproducing element 14 that reads data from the disk medium 2 and a recording element 21 that writes data to the disk medium 2, and a medium facing surface 3 a that faces the disk medium 2. These end faces appear. The recording element 21 is a single magnetic pole type recording head, and includes a recording coil 16, a lower magnetic pole 17, an upper magnetic pole 18, a wraparound shield 19, and a main magnetic pole 20. The main magnetic pole 20 extends to the medium facing surface 3a and emits a recording magnetic field from its end surface. The reproducing element 14 is typically composed of a magnetoresistive effect element and is sandwiched between the lower shield 22 and the upper shield 23.

  In addition, a flying height adjustment actuator (projection adjustment element) 15 is included in the mother body of the thin film head portion 13. In the present embodiment, the flying height adjustment actuator 15 is constituted by a heater. When the base of the thin film head portion 13 expands due to the heat generated by the heater, a part of the medium facing surface 3a including the end face of the recording element 21 and the end face of the reproducing element 14 protrudes toward the disk medium 2. The distance (flying height) between the recording element 21 and the reproducing element 14 and the disk medium 2 is reduced. Here, since the heater brings both the recording element 21 and the reproducing element 14 closer to the disk medium 2, the position between the end face of the recording element 21 and the end face of the reproducing element 14 becomes the center of the protrusion, that is, A part of the medium facing surface 3a is protruded so that the position between the end face of the recording element 21 and the end face of the reproducing element 14 is closest to the disc medium 2. Such control for adjusting the flying height by energizing the heater is called TFC (Thermal Fly-height Control). However, the present invention is not limited to this, and the flying height may be adjusted by another mechanism such as a fine actuator.

  Further, a contact detection sensor 24 (collision detection element) for detecting contact with the disk medium 2 is included in the mother body of the thin film head portion 13, and an end surface thereof appears on the medium facing surface 3 a. The end surface of the contact detection sensor 24 is formed between the end surface of the recording element 21 and the end surface of the reproducing element 14, that is, at a position closer to the disk medium 2 than the recording element 21 and the reproducing element 14. As the contact detection sensor 24, for example, a sensor that detects frictional heat generated by contact between the head slider 3 and the disk medium 2 can be applied. There are giant resistance effect elements (GMR elements) and the like. Further, a resistor whose resistance is changed by frictional heat may be used. As the material of the resistor, iron (Fe), nickel (Ni), chromium (Cr), copper (Cu), tungsten (W), or a mixture thereof can be considered. Further, the contact detection sensor 24 may detect an event other than the frictional heat generated by the contact between the head slider 3 and the disk medium 2. For example, the contact detection sensor 24 may be caused by the distortion of the head slider 3 caused by the contact or the contact. It is also possible to detect minute acoustic emission.

  The magnetic disk device 1 of the present embodiment uses the output from the contact detection sensor 24 when detecting contact between the head slider 3 and the disk medium 2. By using the output from the contact detection sensor 24, the contact between the head slider 3 and the disk medium 2 can be reliably detected with high sensitivity. Further, since it is possible to detect even a relatively weak contact with high sensitivity, the influence of the contact on the reliability of the head / disk interface can be reduced.

  Here, when the reliability of the head / disk interface is taken into consideration, the most serious damage caused by the contact between the head slider 3 and the disk medium 2 is the damage to the main magnetic pole 20 that generates the recording magnetic field. Although depending on the position and dimensions of the flying height adjustment actuator 15, the main magnetic pole 20 is often near the lowest flying point of the head slider 3 due to thermal expansion during the write operation. There is a high possibility of wear due to collision with existing microprotrusions and contamination. The wear of the main magnetic pole 20 may greatly impair the magnetic characteristics of the recording element 21, and it is necessary to detect contact with the disk medium 2 before the wear of the main magnetic pole 20 occurs.

  Therefore, in the present embodiment, the contact detection sensor 24 that detects contact with the disk medium 2 faces the medium so that the contact with the disk medium 2 can be detected before wear of the end face of the main magnetic pole 20 occurs. The position and dimension of the end surface of the contact detection sensor 24 formed in the surface 3a are defined.

FIG. 3A is a diagram illustrating the medium facing surface 3a of the head slider 3 according to the first embodiment. FIG. 3B is an enlarged view of the main part of FIG. 3A and shows the positional relationship between the end face of the main magnetic pole 20 and the end face of the contact detection sensor 24. These drawings are schematic views when the head slider 3 is viewed from the medium facing surface 3a side. In these drawings, _DSL and _DSW represented by arrows represent the slider longitudinal direction and slider width direction of the head slider 3. TR and LD represent the outflow end side and the inflow end side of the head slider 3, and ID and OD represent the inner peripheral side and the outer peripheral side of the disk medium 2. Since the head slider 3 is swung in the substantially radial direction on the disk medium 2 by the voice coil motor 6, the angle formed by the slider longitudinal direction and the rotation direction of the disk medium 2 (so-called skew angle θ) is the disk It changes depending on the radial position of the medium 2. 3A and 3B show the case where the skew angle θ is zero. Further, the end face of the main magnetic pole 20 that generates the recording magnetic field has a width of the side 20b on the inflow side rather than the width of the side 20a on the outflow end side in order to prevent erroneous recording (so-called side erase) on the adjacent track. Has a narrow trapezoidal shape. That is, inclined sides 20c are provided on both sides of the end face of the main pole 20 in the slider width direction so that the inflow end side is closer to the center than the outflow end side. An angle formed by the slider longitudinal direction and the inclined side 20c is called a bevel angle α. The bevel angle α is formed to be approximately the same as the maximum value of the skew angle θ. The shape of the main magnetic pole 20 is not limited to a trapezoidal shape, and may be a triangular shape, or only a part of a side extending from the outflow end side to the inflow end side may be inclined.

The end face of the contact detection sensor 24 that appears on the medium facing surface 3a is formed between the end face of the main pole 20 and the end face of the reproducing element 14, and has a rectangular shape that extends in the slider width direction. . The end on the inner peripheral side of the end surface of the contact detection sensor 24 is more than the end on the inner peripheral side of the end surface of the main pole 20 when the head slider 3 is located on the innermost periphery of the turning range PR (see FIG. 1 above). Is formed so as to project to the inner peripheral side, and the end on the outer peripheral side of the end surface of the contact detection sensor 24 is located on the outer peripheral side of the end surface of the main magnetic pole 20 when the head slider 3 is located on the outermost outer periphery of the turning range PR. It is formed so as to project outward from the end. Specifically, the end on the inner peripheral side in the slider width direction of the end surface of the contact detection sensor 24 is closer to the inner peripheral side in the slider width direction than the end on the inner peripheral side in the slider width direction of the end surface of the main pole 20. The outer end of the end surface of the contact detection sensor 24 in the slider width direction is formed so as to protrude beyond L _w tanθ _{i, and} the end of the main pole 20 is closer to the outer end in the slider width direction than the end of the slider width direction. It is formed so as to protrude beyond L _w tan θ _o on the outer peripheral side in the direction. Further, the width W _s along the slider width direction of the end surface of the contact detection sensor 24 is set to be equal to or larger than W _w + L _w tan θ _i + L _w tan θ _o . Here, _Lw is a distance along the slider longitudinal direction between the end face of the main pole 20 (specifically, the position of the maximum width) and the end face of the contact detection sensor 24 (specifically, the center of the slider longitudinal direction). It is. θ _i is a skew angle θ (maximum value on the inner circumference side) when the head slider 3 is located on the innermost circumference of the turning range PR. θ _o is a skew angle θ (maximum value on the outer peripheral side) when the head slider 3 is positioned on the outermost outer periphery of the turning range PR. _Ww is the width along the slider width direction of the end face of the main pole 20. From another point of view, the bevel angle α of the end face of the main pole 20 is formed to be approximately the same as the maximum values θ _i and θ _o of the skew angle θ, and therefore the end face of the contact detection sensor 24 in the slider width direction. The inner circumferential end is formed so as to protrude beyond L _w tanα on the inner circumferential side in the slider width direction compared to the inner circumferential side end in the slider width direction of the end face of the main magnetic pole 20, and the contact detection sensor 24. The end on the outer peripheral side in the slider width direction of the end face of the main pole 20 is formed so as to protrude beyond L _w tanα on the outer peripheral side in the slider width direction as compared with the end on the outer peripheral side in the slider width direction of the end face of the main pole 20. Also good. In the present embodiment, the end surface of the contact detection sensor 24 is formed so as to protrude by a predetermined distance in both of the slider width directions. However, the present invention is not limited to this, and is not limited to this. It may be formed so as to protrude by a predetermined distance on one side. When the bevel angle α is different between the inner peripheral side and the outer peripheral side, the overhang distance of the contact detection sensor 24 may be determined according to each angle.

  By configuring the end surface of the contact detection sensor 24 as described above, the end surface of the contact detection sensor 24 is located on the inner peripheral side with respect to the end surface of the main magnetic pole 20 regardless of the position of the head slider 3 in the turning range PR. Since it protrudes to the outer peripheral side, it is possible to detect the defect with the contact detection sensor 24 before the surface defect of the disk medium 2 directly contacts the end face of the main magnetic pole 20. Such a configuration of the end face of the contact detection sensor 24 is particularly useful when performing servo writing in which tracks are sequentially formed by the head slider 3 from the inner circumference side to the outer circumference side of the disk medium 2 or vice versa. In the present embodiment, the contact detection sensor 24 is disposed between the lower magnetic pole 17 and the main magnetic pole 20. This is because, depending on the structure in the thin film head portion 13, the area between the lower magnetic pole 17 and the main magnetic pole 20 is often the lowest flying point of the head slider 3. Basically, it is preferable to set the location of the contact detection sensor 24 as close to the lowest flying point of the head slider 3 as possible, but it may be arranged at a different location depending on the configuration.

  4A to 4C are schematic views for explaining the effect of the present invention. These drawings are schematic views when the head slider 3 is viewed from the medium facing surface 3a side. 4A and 4B are schematic views of a reference example in which the configuration of the end surface of the contact detection sensor 24 does not satisfy the above conditions. On the other hand, FIG. 4C is a schematic diagram of an embodiment in which the configuration of the end surface of the contact detection sensor 24 satisfies the above conditions. In these drawings, the head slider 3 floats on the disk medium 2 in a state where the slider longitudinal direction is inclined with respect to the rotation direction DR of the disk medium 2 (skew angle θ> 0).

  Here, as the head slider 3 moves in the radial direction of the disk medium 2, minute defects DF such as minute protrusions and contamination existing on the surface of the disk medium 2 approach the vicinity of the end face of the main magnetic pole 20. Assume the situation.

  As shown in FIG. 4A, when the skew angle θ is relatively small, the contact detection sensor 24 detects the contact with the minute defect DF, so that the end surface of the main magnetic pole 20 and the minute defect DF are detected by TFC control or the like. Can be avoided. On the other hand, as shown in FIG. 4B, when the skew angle θ is relatively large, there is a possibility that the minute defect DF is in direct contact with the end face of the main pole 20 without being detected by the contact detection sensor 24. Come out. When the head slider 3 stays in place, the contact between the end face of the main pole 20 and the minute defect DF is repeated. As a result, the end face of the main pole 20 is worn and the magnetic characteristics of the recording element 21 may be deteriorated. .

  Therefore, when the configuration of the end face of the contact detection sensor 24 satisfies the above-described conditions, as shown in FIG. 4C, the contact of the end face of the main pole 20 before the micro defect DF is brought into contact under any skew angle θ condition. The detection sensor 24 can detect contact with the minute defect DF. Thus, contact between the end face of the main magnetic pole 20 and the minute defect DF can be avoided by TFC control. Alternatively, the contact can be avoided by moving the head slider 3 by the voice coil motor 6.

  5A and 5B are diagrams for explaining the effect of the present invention. These figures show the results of measuring the output of the GMR element when the head slider 3 and the disk medium 2 are in contact with each other. In this measurement, a conventional head slider without the contact detection sensor 24 is used, and the output of the reproducing element 14 made of a GMR element is assumed as the output of the contact detection sensor 24.

  In FIG. 5A, the head slider 3 and the disk medium 2 are brought into contact with each other in a state where the vicinity of the end face of the reproducing element 14 is excessively projected by TFC and the end face of the reproducing element 14 is set to the lowest flying point. The measurement result of the output of the reproducing element 14 is shown. It can be seen that the resistance of the GMR element changes due to the frictional heat generated by the contact between the reproducing element 14 and the disk medium 2, and a spike-like reaction occurs in the output of the reproducing element 14.

  On the other hand, in FIG. 5B, although the vicinity of the end face of the reproducing element 14 is projected by TFC, the head slider 3 and the disk medium 2 are set so that the lowest flying point is the base material portion made of Altic. The measurement result of the output of the reproducing element 14 is shown. Since the reproducing element 14 and the disk medium 2 are not in direct contact, there is no reaction of the resistance change of the GMR element due to frictional heat in the output of the reproducing element 14.

  According to these results, in order to detect that the head slider 3 is in contact with the minute defect DF of the disk medium 2 by the contact detection sensor 24, it is necessary to directly contact the end surface of the contact detection sensor 24 with the minute defect DF. I understand that. That is, as shown in FIG. 4B, when the end surface of the contact detection sensor 24 does not directly contact the minute defect DF, the contact detection sensor 24 may not be able to detect the contact, and this contact is reliably detected. Therefore, the configuration of the end surface of the contact detection sensor 24 needs to satisfy the above conditions.

  FIG. 6 is a flowchart showing an operation example of the magnetic disk device 1. In the magnetic disk device 1 on which the head slider 3 having the contact detection sensor 24 is mounted, when the contact between the head slider 3 and the disk medium 2 is detected by using the output from the contact detection sensor 24, a write error is avoided. An example of the sequence will be described. Specifically, the operation shown in FIG. 6 is realized by the MPU included in the control unit of the magnetic disk device 1 executing a program stored in the memory.

  In the sequence example shown in FIG. 6, it is assumed that a sector in which the occurrence of contact due to a minute defect has been confirmed in advance or that the possibility of contact occurrence has been confirmed is registered as a monitoring sector.

  First, the control unit starts monitoring the output of the contact detection sensor 24, and moves the head slider 3 to the target track while monitoring is continued. When the track positioning is completed, the control unit enters a track following state and prepares for a write operation (S1). Thereafter, the control unit starts writing to the target sector (S2). If the sector is not registered as a monitoring sector (S3: NO), the control unit starts the write operation as it is (S4). On the other hand, if it is registered as a monitoring sector (S3: YES), the control unit avoids a write operation to the sector to avoid a write error (S9). At this time, the control unit avoids contact between the head slider 3 and the disk medium 2 by adjusting the flying height to be increased by TFC or by moving the head slider 3 in the radial direction.

  During the write operation to the sector (S4), when the contact detection sensor 24 does not detect contact between the head slider 3 and the disk medium 2 (S5: NO), the control unit continues the write operation as usual.

  When the contact detection sensor 24 detects contact between the head slider 3 and the disk medium 2 during the write operation to the sector (S4) (S5: YES), the control unit performs the sector and surrounding sectors. (For example, the sector and adjacent sector of the track and the sector and adjacent sector of the adjacent track) are registered as monitoring sectors (S10), and the write operation to the sector is stopped (S11). In order to avoid damage to the head slider 3, the control unit adjusts the flying height to be increased by TFC at the moment when contact is detected, or moves the head slider 3 in the radial direction for a long time. Avoid contact.

  The control unit repeats the above operation until the write operation to the track is completed (S2 to S8), then moves the head slider 3 to the next track (S12), and continues the write operation. Note that the sequence given here is merely an example of the use of the contact detection sensor 24, and the output of the contact detection sensor 24 is used not only at the time of write operation but also at the time of read operation or the head slider 3 and the disk medium 2 for example. It may be used for contact detection monitoring.

  As for the operation when contact is detected by the contact detection sensor 24, for example, a threshold value is stored in advance with respect to the output of the contact detection sensor 24, and an avoidance operation is especially performed for very slight contact below the threshold value. Various ideas are conceivable, such as not implementing it. In any case, when the configuration of the end face of the contact detection sensor 24 satisfies the above conditions, the contact between the end face of the main magnetic pole 20 and the minute defect DF of the disk medium 2 and the accompanying deterioration of the magnetic characteristics of the recording element 21 are caused. It can be avoided.

  FIG. 7A is a diagram illustrating the medium facing surface 3a of the head slider 3 according to the second embodiment. FIG. 7B is an enlarged view of the main part of FIG. 7A and shows the positional relationship between the end face of the main pole 20, the end face of the reproducing element 14, and the end face of the contact detection sensor 24. In addition, about the structure which overlaps with the said embodiment, detailed description is abbreviate | omitted by attaching | subjecting the same number. In the present embodiment, the position and size of the end surface of the contact detection sensor 24 are defined so that the contact with the disk medium 2 can be detected before the end surface of the main magnetic pole 20 and the end surface of the reproducing element 14 are worn. is doing.

The end on the inner peripheral side of the end face of the contact detection sensor 24 is the end on the inner peripheral side of the end face of the main pole 20 when the head slider 3 is located on the innermost periphery of the turning range PR (see FIG. 1). The end surface of the reproducing element 14 is formed so as to protrude from the inner peripheral side to the inner peripheral side, and the head slider 3 is positioned at the outermost periphery of the turning range PR at the outer peripheral end of the end surface of the contact detection sensor 24. In some cases, the main magnetic pole 20 is formed so as to protrude outward from the outer peripheral end of the end face and from the outer peripheral end of the read element 14. Specifically, in the example shown in FIGS. 7A and 7B, the end face of the main pole 20 is located on the inner peripheral side in the slider width direction with respect to the end face of the reproducing element 14, and the end face of the contact detection sensor 24 The end on the inner peripheral side in the slider width direction is formed so as to protrude beyond L _w tanθ _i on the inner peripheral side in the slider width direction compared to the end on the inner peripheral side in the slider width direction of the end face of the main pole 20. The end of the end surface of the contact detection sensor 24 on the outer side in the slider width direction is more stretched than L _r tanθ _o on the outer side of the slider 14 in the slider width direction compared to the outer end of the end surface of the reproducing element 14 in the slider width direction. It is formed to take out. Further, the width W _s along the slider width direction of the end surface of the contact detection sensor 24 is set to be equal to or larger than W _w + W _r + d + L _w tan θ _i + L _r tan θ _o . Here, L _r is the distance along the slider longitudinal direction between the end face of the reproducing element 14 and the end face of the contact detection sensor 24, and W _r is the width along the slider width direction of the end face of the reproducing element 14. , D are offset amounts along the slider width direction between the end face of the main pole 20 and the end face of the reproducing element 14. From another viewpoint, the end on the inner peripheral side in the slider width direction of the end surface of the contact detection sensor 24 is closer to the inner peripheral side in the slider width direction than the end on the inner peripheral side in the slider width direction of the end surface of the main pole 20. the L _w tan [alpha formed to project than, the outer peripheral end of the slider width direction of the end face of the contact detection sensor 24, the slider width compared to the outer peripheral end of the slider width direction of the end face of the reproducing element 14 it may be formed to project than L _r tan [alpha on the outer peripheral side of the direction.

In contrast to the example shown in FIGS. 7A and 7B, when the end face of the main magnetic pole 20 is positioned on the outer peripheral side in the slider width direction with respect to the end face of the reproducing element 14, The end on the inner peripheral side in the slider width direction of the end face is projected to extend more than L _r tanθ _i on the inner peripheral side in the slider width direction as compared with the end on the inner peripheral side in the slider width direction of the end face of the reproducing element 14. The end of the contact detection sensor 24 on the outer side in the slider width direction is closer to the outer side in the slider width direction of the end surface of the main magnetic pole 20 than L _w tanθ _o on the outer side in the slider width direction. Also formed to overhang. Further, the width W _s along the slider width direction of the end surface of the contact detection sensor 24 is set to be equal to or greater than W _w + W _r + d + L _r tan θ _i + L _w tan θ _o . From another viewpoint, the end on the inner peripheral side in the slider width direction of the end surface of the contact detection sensor 24 is closer to the inner peripheral side in the slider width direction than the end on the inner peripheral side in the slider width direction of the end surface of the reproducing element 14. to L _r tan [alpha formed to project than, the outer peripheral end of the slider width direction of the end face of the contact detection sensor 24, the slider width as compared to the slider width direction of the outer peripheral end of the end face of the main magnetic pole 20 it may be formed to project than L _w tan [alpha on the outer peripheral side of the direction.

  In the present embodiment, the end surface of the contact detection sensor 24 is formed so as to protrude by a predetermined distance in both of the slider width directions. However, the present invention is not limited to this, and is not limited to this. It may be formed so as to protrude by a predetermined distance on one side. When the bevel angle α is different between the inner peripheral side and the outer peripheral side, the overhang distance of the contact detection sensor 24 may be determined according to each angle.

  By configuring the end face of the contact detection sensor 24 in this manner, the end face of the contact detection sensor 24 is the end face of the main magnetic pole 20 and the end face of the reproducing element 14 regardless of the position of the head slider 3 in the turning range PR. Since it projects to the inner and / or outer peripheral side from both, the defect is detected by the contact detection sensor 24 before the surface defect of the disk medium 2 directly contacts the end face of the main pole 20 or the end face of the reproducing element 14. Is possible. In the present embodiment, since one contact detection sensor 24 is provided for the end face of the main magnetic pole 20 and the end face of the reproducing element 14, the number of wirings for the contact detection sensor 24 can be suppressed. is there.

  FIG. 8A is a diagram illustrating the medium facing surface 3a of the head slider 3 according to the third embodiment. FIG. 8B is an enlarged view of the main part of FIG. 8A, and shows the positional relationship between the end face of the main magnetic pole 20, the end face of the reproducing element 14, the end face of the contact detection sensor 24, and the end face of the second contact detection sensor 30. To express. In addition, about the structure which overlaps with the said embodiment, detailed description is abbreviate | omitted by attaching | subjecting the same number. In the present embodiment, the end face of the contact detection sensor 24 is formed on the side close to the end face of the main pole 20 between the end face of the main pole 20 and the end face of the read element 14. An end face of the second contact detection sensor 30 is formed on the near side. In the present embodiment, the position and size of the end surface of the second contact detection sensor 30 are defined so that the contact with the disk medium 2 can be detected before the end surface of the reproducing element 14 is worn. The position and dimensions of the end surface of the contact detection sensor 24 are the same as those in the first embodiment.

The end on the inner peripheral side of the end face of the second contact detection sensor 30 is the inner peripheral side of the end face of the reproducing element 14 when the head slider 3 is located in the innermost periphery of the turning range PR (see FIG. 1 above). The end on the outer peripheral side of the end surface of the second contact detection sensor 30 is formed so as to protrude to the inner peripheral side from the end of the head when the head slider 3 is located on the outermost peripheral side of the turning range PR. It is formed so as to project to the outer peripheral side from the outer peripheral end of the end face. Specifically, the end on the inner peripheral side in the slider width direction of the end surface of the second contact detection sensor 30 is the inner end in the slider width direction compared to the end on the inner peripheral side in the slider width direction of the end surface of the reproducing element 14. is formed so as to protrude than L _r tan .theta _i in the circumferential side, the outer peripheral end of the second slider width direction of the end face of the contact detection sensor 30, the outer peripheral end of the slider width direction of the end face of the reproducing element 14 Compared to the slider width direction, it is formed so as to protrude beyond L _r tanθ _o on the outer circumferential side in the slider width direction. Further, the width W _s along the slider width direction of the end surface of the second contact detection sensor 30 is set to be equal to or larger than W _r + L _r tan θ _i + L _r tan θ _o . Here, L _r is the distance along the slider longitudinal direction between the end face of the reproducing element 14 and the end face of the second contact detection sensor 30. From another viewpoint, the end on the inner peripheral side in the slider width direction of the end surface of the second contact detection sensor 30 is closer to the inner end in the slider width direction of the end surface of the reproducing element 14 in the slider width direction. the inner peripheral side is formed so as to protrude than L _r tan [alpha outer peripheral end of the second slider width direction of the end face of the contact detection sensor 30, the outer peripheral end of the slider width direction of the end face of the reproducing element 14 Compared with, it may be formed so as to protrude beyond L _r tanα on the outer peripheral side in the slider width direction. In the present embodiment, the end surface of the second contact detection sensor 30 is formed so as to protrude by a predetermined distance in both of the slider width directions. However, the present invention is not limited to this, and the inner peripheral side in the slider width direction and It may be formed so as to project from the outer peripheral side by a predetermined distance. When the bevel angle α is different between the inner peripheral side and the outer peripheral side, the overhang distance of the contact detection sensor 24 may be determined according to each angle.

  By configuring the end surface of the second contact detection sensor 30 in this way, the end surface of the second contact detection sensor 30 is more than the end surface of the reproducing element 14 regardless of the position of the turning range PR of the head slider 3. Furthermore, the second contact detection sensor 30 can detect the defect before the defect on the surface of the disk medium 2 comes into direct contact with the end face of the reproducing element 14 because the defect extends to the inner peripheral side and / or the outer peripheral side. is there. Further, since the end surface of the contact detection sensor 24 and the end surface of the second contact detection sensor 30 can be disposed close to the end surface of the main magnetic pole 20 and the end surface of the reproducing element 14, respectively, The size of the second contact detection sensor 30 can be reduced to increase the sensitivity of contact detection.

  In the present embodiment, the second contact detection sensor 30 is disposed between the lower magnetic pole 17 and the upper shield 23. However, depending on the configuration, for example, the second contact detection sensor 30 may be disposed on the inflow end side of the lower shield 22, etc. You may arrange in another place. In the present embodiment, the contact detection sensor 24 and the second contact detection sensor 30 are provided. However, depending on the configuration, only the second contact detection sensor 30 is provided, and the contact in the vicinity of the reproducing element 14 is provided. Only detection may be performed. Further, when the contact detection sensor 24 and the second contact detection sensor 30 are provided side by side, in the thin film head unit 13, wirings may be provided independently of each other, or wirings that connect them in series or in parallel are provided. May be. Alternatively, the wiring may be shared in order to simplify the wiring. Furthermore, when the contact detection sensor 24 and the second contact detection sensor 30 are provided side by side, the size may be made smaller than the above condition in order to increase the contact detection sensitivity.

FIG. 9 is a diagram illustrating the medium facing surface 3a of the head slider 3 according to a modification of the third embodiment. In this modification, the contact detection sensor 24 is configured by a group of a plurality of element portions 24a to 24c. Each element part 24a-24c is comprised with a GMR element, a resistor, etc. similarly to the said embodiment. The end faces of the element portions 24a to 24c that appear on the medium facing surface 3a have rectangular shapes extending in the slider width direction, and are formed at different positions in the slider width direction so as to spread in the slider width direction. Are arranged. The end surfaces of these element portions 24a to 24c are formed so that the positions in the slider width direction of adjacent end portions coincide or overlap so that no gap is generated in the slider width direction. Further, the end surfaces of the element portions 24a to 24c are arranged in a step shape while being slightly shifted in the slider longitudinal direction. As described above, the contact detection sensor 24 configured by the group of the plurality of element units 24a to 24c is configured to satisfy the same condition as that of the above-described embodiment when viewed as the entire group. However, _{L w} and _{L r} is the starting point of the slider longitudinal center position of the element section 24a-24c. Thus, by configuring the contact detection sensor 24 as a group of a plurality of element parts 24a to 24c, the size of each element part 24a to 24c can be reduced, and the contact sensitivity can be increased. In the present modification, the second contact detection sensor 30 is also configured by a group of a plurality of element units 30a, like the contact detection sensor 24, and has the same conditions as in the above embodiment when viewed as a whole group. Configured to meet.

  As mentioned above, although this invention was demonstrated taking the preferable embodiment as an example, this invention is not limited to the said embodiment. A person skilled in the art can easily change, add, and convert each element of the above embodiment within the scope of the present invention. For example, the present invention may be applied to a disk device other than the magnetic disk device. Further, the present invention may be applied to a magnetic disk device in which the flying height is controlled by a piezo element or the like instead of the TFC. In order to make contact detection between the head slider and the disk medium more reliable, a plurality of contact detection sensors may be provided.

  DESCRIPTION OF SYMBOLS 1 Magnetic disk apparatus, 2 Disk medium, 3 Head slider, 4 Suspension, 5 Arm, 6 Voice coil motor (2nd actuator), 7 Spindle motor (1st actuator), 8 Base, 9 Lamp mechanism, 12 Slider board Part, 13 thin film head part, 14 reproducing element, 15 flying height adjustment actuator (projection adjusting element), 16 recording coil, 17 lower magnetic pole, 18 upper magnetic pole, 19 wraparound shield, 20 main magnetic pole, 20a, 20b side, 20c Inclined side, 21 Recording element, 22 Lower shield, 23 Upper shield, 24 Contact detection sensor (collision detection element), 24a to 24c Element section, 30 Second contact detection sensor (second collision detection element), 30a to 30c Element part.

Claims (14)

A disk medium;
A first actuator for rotating the disk medium;
A head slider that floats on the disk medium;
A second actuator for rotating the head slider between an inner periphery and an outer periphery of the disk medium around a rotation axis defined outside the disk medium;
With
The head slider is
A recording element for writing data to the disk medium;
A collision detection element for detecting a collision with the disk medium;
Including
In the medium facing surface of the head slider facing the disk medium, an end surface of the recording element that generates a recording magnetic field and an end surface of the collision detection element are formed,
When the head slider is positioned at the innermost periphery of the turning range, the end on the inner peripheral side of the end surface of the collision detection element protrudes to the inner peripheral side from the end on the inner peripheral side of the end surface of the recording element; and / Or when the head slider is located on the outermost periphery of the turning range, the outer peripheral end of the end face of the collision detection element protrudes to the outer peripheral side from the outer peripheral end of the end face of the recording element;
A magnetic disk device characterized by the above. The head slider includes a reproducing element that reads data from the disk medium,
An end face of the reproducing element is formed in the medium facing surface,
When the head slider is positioned at the innermost periphery of the turning range, the inner peripheral end of the end surface of the collision detection element is the inner peripheral end of the end surface of the recording element and the inner periphery of the end surface of the reproducing element. The end of the collision detection element is located on the outer periphery of the end face of the recording element when the head slider is positioned on the outermost periphery of the turning range. Projecting to the outer peripheral side from the end on the side and the end on the outer peripheral side of the end face of the reproducing element,
The magnetic disk device according to claim 1. The head slider includes a reproduction element that reads data from the disk medium, and a second collision detection element that detects a collision with the disk medium,
An end face of the reproducing element and an end face of the second collision detection element are formed in the medium facing surface,
When the head slider is located at the innermost circumference of the turning range, the end face of the second collision detection element is the end face on the inner circumference side of the end face of the second collision detection element. The end on the outer peripheral side of the end surface of the second collision detection element is projected to the reproduction side when the head slider projects to the inner peripheral side from the inner peripheral end and / or the head slider is located on the outermost periphery of the turning range. Projects to the outer peripheral side from the outer peripheral end of the element end face.
The magnetic disk device according to claim 1. The end on the inner peripheral side in the slider width direction of the end face of the collision detecting element is closer to the inner peripheral side in the slider width direction than L _w tanθ _i compared to the inner peripheral end in the slider width direction of the end face of the recording element. The end of the collision detection element on the outer peripheral side in the slider width direction is closer to the outer peripheral side in the slider width direction than the outer end in the slider width direction of the end face of the recording element. overhang than _w tanθ _o ,
The magnetic disk device according to claim 1.
However, _Lw is the distance along the slider longitudinal direction between the end face of the recording element and the end face of the collision detection element, and θ _i is when the head slider is located at the innermost circumference of the turning range. The angle formed by the slider longitudinal direction and the rotation direction of the disk medium, and θ _o is the angle formed by the slider longitudinal direction and the disk medium rotation direction when the head slider is located at the outermost periphery of the turning range. It is. The end face of the recording element is located on the outer peripheral side in the slider width direction from the end face of the reproducing element,
The end on the inner peripheral side in the slider width direction of the end surface of the collision detection element is closer to the inner peripheral side in the slider width direction than L _r tanθ _i compared to the inner peripheral end in the slider width direction of the end surface of the reproducing element. The end of the collision detection element on the outer peripheral side in the slider width direction is closer to the outer peripheral side in the slider width direction than the outer end in the slider width direction of the end face of the recording element. overhang than _w tanθ _o ,
The magnetic disk device according to claim 2.
However, L _w is the distance along the slider longitudinal direction between the end surface and the end surface of the collision detection device of the recording element, L _r, the slider longitudinal between the end face and the end face of the collision detection device of the read element Is the distance along the direction, θ _i is the angle formed by the longitudinal direction of the slider and the rotation direction of the disk medium when the head slider is located at the innermost circumference of the turning range, and θ _o is the angle This is the angle formed by the longitudinal direction of the slider and the rotational direction of the disk medium when the head slider is positioned on the outermost periphery of the turning range. The end face of the recording element is located on the inner peripheral side in the slider width direction from the end face of the reproducing element,
The end on the inner peripheral side in the slider width direction of the end face of the collision detecting element is closer to the inner peripheral side in the slider width direction than L _w tanθ _i compared to the inner peripheral end in the slider width direction of the end face of the recording element. The end of the collision detection element on the outer circumferential side in the slider width direction is closer to the outer circumferential side in the slider width direction than the outer end in the slider width direction of the end face of the reproducing element. overhang than _r tanθ _o ,
The magnetic disk device according to claim 2.
However, L _w is the distance along the slider longitudinal direction between the end surface and the end surface of the collision detection device of the recording element, L _r, the slider longitudinal between the end face and the end face of the collision detection device of the read element Is the distance along the direction, θ _i is the angle formed by the longitudinal direction of the slider and the rotation direction of the disk medium when the head slider is located at the innermost circumference of the turning range, and θ _o is the angle This is the angle formed by the longitudinal direction of the slider and the rotational direction of the disk medium when the head slider is positioned on the outermost periphery of the turning range. The inner peripheral end of the slider width direction of the end face of the second collision sensing elements, as compared to the inner peripheral end of the slider width direction of the end face of the reproducing element on the inner peripheral side of the width direction of the slider L _r The end of the end surface of the second collision detection element extends beyond tan θ _i and / or the outer end in the slider width direction of the end face of the second collision detecting element is wider than the end of the end face of the reproducing element in the slider width direction. Overhanging L _r tanθ _o on the outer peripheral side in the direction,
The magnetic disk device according to claim 3.
Where L _r is the distance along the slider longitudinal direction between the end face of the reproducing element and the end face of the second collision detection element, and θ _i is the innermost circumference of the turning range of the head slider. Is the angle formed by the longitudinal direction of the slider and the rotational direction of the disk medium, and θ _o is the longitudinal direction of the slider and the rotational direction of the disk medium when the head slider is located at the outermost periphery of the turning range. It is the angle that makes. The collision detection element includes a plurality of element units capable of detecting a collision with the disk medium,
In the medium facing surface, end surfaces of the plurality of element portions are formed at different positions in the slider width direction.
The magnetic disk device according to claim 1. The recording element has a main pole that extends to the medium facing surface and emits a recording magnetic field from an end surface thereof.
The end face of the main magnetic pole has an inclined side whose leading side is closer to the center part of the end face in the slider width direction than the trailing side,
One end in the slider width direction of the end face of the collision detection element protrudes from one end in the slider width direction of the end face of the main pole to one side in the slider width direction from L _w tanα, and / or Alternatively, the end on the other side in the slider width direction of the end face of the collision detection element protrudes beyond L _w tanα to the other end in the slider width direction compared to the end on the other side in the slider width direction of the end face of the main pole. ,
A head slider characterized by that.
However, _Lw is the distance along the slider longitudinal direction between the end face of the main pole and the end face of the collision detection element, and α is the inclination angle of the inclined side with respect to the slider longitudinal direction. The head slider is
A reproducing element for reading data from the disk medium;
A protrusion adjusting element that causes a part of the medium facing surface including an end face of the recording element and an end face of the reproducing element to protrude toward the disk medium;
Including
An end face of the reproducing element is formed in the medium facing surface,
The end face of the collision detection element is located between the end face of the recording element and the end face of the reproducing element.
The magnetic disk device according to claim 1. A head slider that floats on a rotating disk medium,
A recording element for writing data to the disk medium;
A reproducing element for reading data from the disk medium;
Of the medium facing surface of the head slider that faces the disk medium, a protrusion adjustment element that causes a part including the end face of the recording element and the end face of the reproducing element to protrude toward the disk medium;
A collision detection element for detecting a collision with the disk medium, the collision detection element having an end surface located between the end surface of the recording element and the end surface of the reproducing element;
including,
A head slider characterized by that. A head slider that floats on a rotating disk medium,
A recording element having a main magnetic pole extending to a medium facing surface facing the disk medium of the head slider and generating a recording magnetic field from its end surface;
A collision detection element for detecting a collision with the disk medium;
Including
The end face of the main pole has an inclined side closer to the center part in the slider width direction of the end face than the trailing side on the leading side,
One end in the slider width direction of the end face of the collision detection element protrudes from one end in the slider width direction of the end face of the main pole to one side in the slider width direction from L _w tanα, and / or Alternatively, the end on the other side in the slider width direction of the end face of the collision detection element protrudes beyond L _w tanα to the other end in the slider width direction compared to the end on the other side in the slider width direction of the end face of the main pole. ,
A head slider characterized by that.
However, _Lw is the distance along the slider longitudinal direction between the end face of the main pole and the end face of the collision detection element, and α is the inclination angle of the inclined side with respect to the slider longitudinal direction. The head slider includes a reproducing element that reads data from the disk medium,
The end face of the main magnetic pole is located on one side in the slider width direction from the end face of the reproducing element formed on the medium facing surface,
One end in the slider width direction of the end face of the collision detection element protrudes from one end in the slider width direction of the end face of the main pole to one side in the slider width direction from L _w tanα, and / or Alternatively, the end on the other side in the slider width direction of the end face of the collision detection element protrudes from the other end in the slider width direction of the end face of the reproducing element to the other in the slider width direction beyond L _r tanα. ,
The head slider according to claim 12.
Here, _Lr is a distance along the longitudinal direction of the slider between the end face of the reproducing element and the end face of the collision detecting element. The head slider includes a reproduction element that reads data from the disk medium, and a second collision detection element that detects a collision with the disk medium,
An end face of the reproducing element and an end face of the second collision detection element are formed in the medium facing surface,
One end in the slider width direction of the end face of the second collision detection element protrudes from one end in the slider width direction of the end face of the reproducing element to L _r tanα in one side in the slider width direction. And / or the other end in the slider width direction of the end face of the second collision detection element is L on the other end in the slider width direction compared to the other end in the slider width direction of the end face of the reproducing element. overhang than _r tanα,
The head slider according to claim 12.
Here, _Lr is a distance along the longitudinal direction of the slider between the end face of the reproducing element and the end face of the collision detecting element.