WO2004097822A1 - 記録再生ヘッド及び記録再生装置 - Google Patents
記録再生ヘッド及び記録再生装置 Download PDFInfo
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- WO2004097822A1 WO2004097822A1 PCT/JP2004/006045 JP2004006045W WO2004097822A1 WO 2004097822 A1 WO2004097822 A1 WO 2004097822A1 JP 2004006045 W JP2004006045 W JP 2004006045W WO 2004097822 A1 WO2004097822 A1 WO 2004097822A1
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- Prior art keywords
- recording
- data
- phase change
- reproducing
- recording medium
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- 230000008859 change Effects 0.000 claims abstract description 107
- 239000000523 sample Substances 0.000 claims abstract description 91
- 239000012782 phase change material Substances 0.000 claims description 116
- 230000005684 electric field Effects 0.000 claims description 68
- 230000010355 oscillation Effects 0.000 claims description 59
- 238000001514 detection method Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000001360 synchronised effect Effects 0.000 claims description 11
- 238000000386 microscopy Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 239000010408 film Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 238000004630 atomic force microscopy Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 229910018321 SbTe Inorganic materials 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
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- 238000013144 data compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/06—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using record carriers having variable electrical capacitance; Record carriers therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/08—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by electric charge or by variation of electric resistance or capacitance
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/12—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using near-field interactions; Record carriers therefor
- G11B9/14—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using near-field interactions; Record carriers therefor using microscopic probe means, i.e. recording or reproducing by means directly associated with the tip of a microscopic electrical probe as used in Scanning Tunneling Microscopy [STM] or Atomic Force Microscopy [AFM] for inducing physical or electrical perturbations in a recording medium; Record carriers or media specially adapted for such transducing of information
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/06—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using record carriers having variable electrical capacitance; Record carriers therefor
- G11B9/07—Heads for reproducing capacitive information
- G11B9/075—Heads for reproducing capacitive information using mechanical contact with record carrier, e.g. by stylus
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/12—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using near-field interactions; Record carriers therefor
- G11B9/14—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using near-field interactions; Record carriers therefor using microscopic probe means, i.e. recording or reproducing by means directly associated with the tip of a microscopic electrical probe as used in Scanning Tunneling Microscopy [STM] or Atomic Force Microscopy [AFM] for inducing physical or electrical perturbations in a recording medium; Record carriers or media specially adapted for such transducing of information
- G11B9/1409—Heads
Definitions
- the present invention relates to a recording / reproducing head for recording data on a phase-change recording medium using a phase-change material or reproducing data recorded on the phase-change recording medium, a recording apparatus, a reproducing apparatus, and a recording / reproducing apparatus.
- a recording / reproducing head for recording data on a phase-change recording medium using a phase-change material or reproducing data recorded on the phase-change recording medium
- a recording apparatus for reproducing data recorded on the phase-change recording medium
- a reproducing apparatus for reproducing data recorded on the phase-change recording medium
- Optical recording records data by forming pits in a layer of organic dye or phase change material formed on a disc using an optical pickup using a laser as a light source. The data is reproduced using the fact that the reflectance of the data is different. Others use the magneto-optical effect to record and reproduce data. However, optical pickups are larger than HDD magnetic heads and are not suitable for high-speed reading. Since the pit size is defined by the diffraction limit of light, the recording density is limited to 50 Gbit / inch 2 .
- the longitudinal recording of magnetic recording typified by HDDs has recently been implemented with MR heads using Giant Magnetic Resistance (GMR), and by using perpendicular magnetic recording, the recording density is higher than that of optical disks.
- GMR Giant Magnetic Resistance
- the thermal density of magnetic recording information and the presence of Bloch walls in the sign-reversal area, and the recording density is limited to 1 Tbit / inch 2 even when using patterned media that takes these factors into account.
- SNDM can determine the sign of the ferroelectric domain by measuring the nonlinear permittivity of the ferroelectric recording medium.
- the recording / reproducing device applying SNDM technology applies an electric field higher than the coercive electric field to the ferroelectric recording medium from the probe, and the dielectric recording medium has a predetermined polarization direction.
- Data is recorded by forming a polarization domain.
- the polarization state is detected from the frequency fluctuation of the oscillation signal oscillating at the resonance frequency formed by the capacitance and the inductor of the dielectric recording medium immediately below the probe, and the data is reproduced.
- a recording medium using a phase change material generally has a high recording resolution.
- the recording density is defined by the laser diffraction limit, and there is a limit to the improvement of the recording density.
- an object of the present invention is to record data on a phase change recording medium using a probe memory technique or to reproduce data recorded on a phase change recording medium using an SNDM method.
- a recording / reproducing head capable of increasing the recording density and realizing high-quality recording / reproducing of data, a recording / reproducing head to which the recording / reproducing head is applied, An apparatus and a recording / reproducing apparatus are provided.
- a first recording / reproducing head is a recording / reproducing head for recording data on a phase change recording medium or reproducing data recorded on a phase change recording medium.
- the tip has a substantially spherical projection tip with a predetermined radius at the tip, a reproducing electrode for detecting data, an insulating film covering the tip of the reproducing electrode, and a data recording element provided on the insulating film to record data. And a return electrode provided around the probe and returning a high-frequency component of an electric field applied to the probe.
- a first recording / reproducing head according to the present invention has a probe for recording or reproducing data in contact with or in proximity to a phase change material.
- This probe is provided with a reproducing electrode having a substantially spherical tip at the center thereof, and the tip of the reproducing electrode is covered with an insulating film. Further, the probe is insulated from the reproducing electrode on the insulating film. It has a resistor. Around the probe thus configured, a return electrode is provided for returning a high-frequency component of an electric field applied to the probe. Further, lead wires may be provided at both ends of the diameter of the resistor in order to apply a voltage to the resistor.
- a pulse voltage corresponding to the data is applied to the resistor of the probe, and the recording is performed by changing the phase change material from crystalline to amorphous by the heat generated by the resistor.
- the heating conditions for the medium it is possible to return from an amorphous state to a crystalline state, thereby erasing recorded data.
- an electric field is applied to the phase change recording medium, and reproduction is performed by judging the difference in the dielectric constant between the crystalline and amorphous phase change materials.
- the return electrode is an electrode for returning a high-frequency electric field oscillating with a capacitance corresponding to a crystalline or amorphous dielectric constant.
- a second recording / reproducing head is a recording / reproducing head for recording data on a phase-change recording medium or reproducing data recorded on a phase-change recording medium.
- a support member having a substantially spherical projection with a predetermined radius at the tip thereof, a probe provided at the tip of the support member, and comprising a resistor which generates heat when recording data; And a return electrode provided therearound for returning a high-frequency component of an electric field applied to the probe.
- a second recording / reproducing head has a probe for recording or reproducing data in contact with or in proximity to a phase change material.
- This probe has a support member at the center, which is made of an insulating member having a substantially spherical tip, and a resistor covering the tip of the support member. It has.
- a return electrode for returning a high-frequency component of an electric field applied to the probe is provided around the probe configured as described above.
- a pulse voltage corresponding to the data is applied to the resistor of the probe, and the recording is performed by changing the phase change material from crystalline to amorphous by the heat generated by the resistor. It is desirable to apply the voltage from both ends of the diameter of the resistor.
- the resistor is disconnected from the heating circuit, a circuit configuration for applying an electric field to the phase change recording medium, and an electric field is applied to the phase change material. Then, the recorded data is reproduced by determining the difference in the dielectric constant between the crystalline and amorphous phase change materials.
- the return electrode is an electrode for returning a high-frequency electric field oscillating with a capacitance corresponding to a crystalline or amorphous dielectric constant.
- the amount of heat generated by the resistor is configured so as to change the phase change material from crystalline to amorphous. Is also good.
- the state of the phase change material initially set to crystalline is changed from crystalline to amorphous in accordance with the data. This allows data to be recorded on the phase change material.
- the recording / reproducing head records or reproduces data on a phase-change recording medium based on nonlinear dielectric microscopy. It may be.
- a recording device is a recording device for recording data on a phase change material of a phase change recording medium, comprising the first or second recording / reproducing head described above, and a resistance of the recording / reproducing head.
- Heating means for energizing the body to generate heat according to the data
- recording signal generating means for generating a recording signal corresponding to the data input to the heating means.
- a voltage corresponding to the data to be recorded is applied to the antibody of the first or second recording / reproducing head, and the heat generated thereby causes the phase change of the recording medium.
- the changing material is changed from crystalline to amorphous according to the data. As a result, data is recorded.
- a first reproducing apparatus is a reproducing apparatus for reproducing data recorded on a phase change material of a phase change recording medium, wherein the first recording / reproducing head described above and an electric field are applied to the phase change recording medium.
- Means for applying an electric field an oscillation means whose oscillation frequency changes according to the difference in crystalline or amorphous permittivity of the phase change material of the phase change recording medium, and an oscillation signal demodulated by the oscillation means.
- an electric field is applied to the phase change recording medium.
- an alternating electric field may be generated by applying an AC signal to the phase change recording medium, or an electric field may be generated by applying a DC bias voltage to the phase change recording medium.
- the oscillating frequency of the oscillating signal of the oscillating means changes according to the difference in the crystalline or amorphous permittivity of the phase change material. Data is reproduced based on the oscillation frequency of this oscillation signal.
- the oscillation frequency of the oscillation signal is determined by the resonance frequency determined by the capacitance immediately below the probe according to the difference in the crystalline or amorphous dielectric constant of the phase change material, and the inductance of the external inductor. That is, the capacitance changes according to the crystalline or amorphous dielectric constant, and the oscillation frequency is FM-modulated by the change in capacitance. This FM modulation is demodulated, and data is reproduced from the demodulated signal.
- a second reproducing apparatus is a reproducing apparatus for reproducing data recorded on a phase change material of a phase change recording medium, wherein the second recording and reproducing head and the phase change recording medium described above are used.
- An electric field applying means for applying an electric field; an oscillating means whose oscillation frequency changes in accordance with a difference in crystalline or amorphous permittivity of the phase change material of the phase change recording medium; and an oscillating signal by the oscillating means being demodulated.
- a data reproducing means for reproducing data from the signal demodulated by the demodulating means.
- an electric field is applied to the phase change recording medium.
- an alternating electric field may be generated by applying an AC signal to the phase change recording medium, or an electric field may be generated by applying a DC bias voltage to the phase change recording medium.
- the oscillation frequency of the oscillation signal of the oscillation means changes according to the crystalline or amorphous dielectric constant of the phase change material. Data is reproduced based on the oscillation frequency of this oscillation signal.
- the oscillation frequency of the oscillation signal is determined by the resonance frequency determined by the capacitance just below the probe according to the difference in the crystalline or amorphous dielectric constant of the phase change material and the inductance of the externally attached inductor. You.
- the capacitance changes in accordance with the difference in the dielectric constant between crystalline and amorphous, and the oscillation frequency is FM-modulated by the change in capacitance.
- the FM modulation is demodulated, and data is reproduced from the demodulated signal.
- the resistor of the second recording / reproducing head described above is used as a heating means at the time of data recording.
- the resistor is used as a means for detecting data. ing.
- the data reproducing means may be configured to perform synchronous detection.
- the alternating electric field corresponds to the crystalline or amorphous dielectric constant of the phase change material.
- the oscillation signal FM-modulated based on the obtained capacity is FM-demodulated, and data is reproduced from the demodulated signal by synchronous detection.
- the AC signal applied to the phase change recording medium by the electric field application means is used as a reference signal for the synchronous detection.
- the data reproducing means may be configured to perform phase detection.
- the alternating electric field corresponds to the crystalline or amorphous dielectric constant of the phase change material.
- the FM signal is FM-demodulated based on the obtained capacity, and the data is reproduced by phase detection, which compares the phase of the demodulated signal with the AC signal applied by the electric field applying means.
- a first recording / reproducing apparatus is a recording / reproducing apparatus using the above-mentioned first recording / reproducing head for recording or reproducing data on a phase change material of a phase change recording medium.
- a heating means for energizing a resistor of a probe to generate heat in accordance with data
- a recording signal generating means for generating a recording signal corresponding to data input to the heating means.
- first recording / reproducing apparatus data can be recorded / reproduced on / from the phase-change material of the phase-change recording medium using the above-mentioned first recording / reproducing head.
- a voltage corresponding to the data to be recorded is applied to the resistor of the recording / reproducing head, and the heat generated causes the phase change material of the phase change recording medium to change from crystalline to amorphous according to the data.
- the data is recorded by changing to.
- an electric field is applied to the phase change recording medium.
- an alternating electric field may be generated by applying an AC signal to the phase change recording medium, or an electric field may be generated by applying a DC bias voltage to the phase change recording medium.
- the oscillation frequency of the oscillation signal of the oscillation means changes according to the crystalline or amorphous dielectric constant of the phase change material, the data is reproduced based on the oscillation frequency.
- the oscillation frequency of the transmitted signal is determined by the resonance frequency determined by the capacitance immediately below the probe according to the crystalline or amorphous permittivity of the phase change material and the inductance of the external inductor.
- the capacitance changes in accordance with the difference in the crystalline or amorphous permittivity of the phase change material, and the oscillation frequency is FM-modulated by the change in the capacitance.
- the FM-modulated signal is demodulated, and data is reproduced from the demodulated signal.
- a second recording / reproducing apparatus is a recording / reproducing apparatus using the above-mentioned second recording / reproducing head for recording or reproducing data on a phase change material of a phase change recording medium.
- a heating means for energizing a resistor of a probe to generate heat according to data
- a recording signal generating means for generating a recording signal corresponding to data input to the heating means.
- an electric field applying means for applying an electric field to the phase change recording medium, and the oscillation frequency changes according to a difference in the crystalline or amorphous dielectric constant of the phase change material of the phase change recording medium.
- Oscillating means for recovering the oscillation signal from the oscillating means.
- a data reproducing means for reproducing data from the signal demodulated by the demodulating means, and the recording signal is applied to the resistor during recording by the recording signal generating means.
- switching means for applying an electric field to the phase change recording medium by the electric field applying means.
- data can be recorded / reproduced on the phase-change material of the phase-change recording medium using the above-mentioned second recording / reproducing head.
- a voltage corresponding to the data to be recorded is applied to the resistor of the recording / reproducing head, and the heat generated causes the phase change material of the phase change recording medium to change from crystalline to amorphous according to the data. Change.
- data is recorded.
- an electric field is applied to the phase change recording medium.
- an alternating electric field may be generated by applying an AC signal to the phase change recording medium, or an electric field may be generated by applying a DC bias voltage to the phase change recording medium.
- the oscillation frequency of the oscillation signal of the oscillation means changes according to the crystalline or amorphous dielectric constant, data is reproduced based on the change in the oscillation frequency.
- the oscillation frequency of the transmitted signal is determined by the resonance frequency determined by the capacitance immediately below the probe according to the crystalline or amorphous permittivity of the phase change material and the inductance of the external inductor.
- the capacitance changes in accordance with the difference in the crystalline or amorphous dielectric constant of the phase change material, and the oscillation frequency is FM-modulated by the change in the capacitance.
- the FM-modulated signal is demodulated, and data is reproduced from the demodulated signal.
- the second recording / reproducing head used in this embodiment uses a resistor as a heating means during recording and as a data detecting means during reproduction. Therefore, at the time of recording, a recording signal by the recording signal generating means is applied to the resistor, and at the time of reproduction, an electric field is applied to the phase change recording medium by the electric field applying means. Switching between a circuit for applying a recording signal during recording and a circuit for applying an electric field during reproduction is performed by a switching unit.
- the data reproducing means may be configured to perform synchronous detection.
- the data reproducing means may be configured to perform phase detection.
- the alternating electric field corresponds to the crystalline or amorphous dielectric constant of the phase change material.
- the FM signal is FM-demodulated based on the obtained capacity, and the data is reproduced by phase detection, which compares the phase of the demodulated signal with the AC signal applied by the electric field applying means.
- a needle-shaped probe, a cantilever-shaped probe, or the like can be used as a probe for applying an electric field.
- the electrodes having these shapes are collectively referred to as “probes” as appropriate.
- phase change material for example, a GeInSbTe-based phase change material which is a eutectic material is used, but another phase change material may be used.
- the recording / reproducing head, the recording apparatus, or the recording / reproducing apparatus of the present invention a very small probe is used to heat a very small area of the phase change material. Since the data is recorded by changing the crystalline and amorphous properties, the data recording density can be greatly increased. Therefore, it is possible to overcome the limit of the recording density, which has been a limit in the conventional optical disk system, and to realize ultra-high-density recording of data.
- the heat generating portion of the probe is extremely small, and its heat capacity is small, so that the recording response speed can be made practically sufficient.
- the recording / reproducing head, the reproducing apparatus, or the recording / reproducing apparatus of the present invention attention is paid to the fact that the crystalline or amorphous phase change material has a different linear dielectric constant or nonlinear dielectric constant. Since the data is reproduced by detecting the change in the dielectric constant of the variable material, data recorded at an ultra-high density can be reproduced clearly and with high quality. In particular, since the SNDM technology can be applied, realizing recording / reproducing performance equivalent to or better than the recording / reproducing technology using a strong dielectric as a recording medium Can be.
- FIG. 1 is a diagram showing a first embodiment of a recording / reproducing head according to the present invention.
- FIG. 2 is a diagram showing a second embodiment of the recording / reproducing head according to the present invention.
- FIG. 3 is a diagram for explaining recording and reproduction of information on a phase change material.
- FIG. 4 is a diagram showing a configuration of an embodiment of the recording apparatus according to the present invention.
- FIG. 5 is a diagram showing the configuration of an embodiment of the reproducing apparatus according to the present invention.
- FIG. 6 is a diagram showing the configuration of the first embodiment of the recording / reproducing apparatus according to the present invention.
- FIG. 7 is a diagram showing a configuration of a second embodiment of the recording / reproducing apparatus according to the present invention.
- FIG. 1 (a) is a plan view of the present embodiment
- FIG. 1 (b) is a cross-sectional view taken along line A1_A1 in FIG. 1 (a).
- the recording / reproducing head 1 has a recording / reproducing electrode 11 a, an insulating layer 13 provided at the tip of the recording / reproducing electrode 11 a, and an insulating layer 13.
- the probe 11 includes a probe 11 including a resistor 14 provided, and a return electrode 12 provided around the probe 11.
- the probe 11 comprises (i) a recording / reproducing electrode 11 a having a substantially spherical shape having a predetermined radius at its tip, that is, a portion facing the phase change material 16, and (ii) a conductive member. It has an insulating layer 13 made of an insulating member provided at the tip of the recording / reproducing electrode 11a, and (iii) a resistor 14 provided on the insulating layer 13 and having a predetermined specific resistance. ing.
- the recording / reproducing electrode 11 a is an electrode obtained by nonlinear dielectric microscopy, and the tip of the probe 11 facing the phase change material 16 of the phase change recording medium 20 has a pole having a radius of 10 nm order. It is small.
- the phase change material 16 is set to be crystalline on the entire recording surface as an initial state.
- the phase change material 16 for example, a GeInSbTe type phase change material which is a eutectic material is used.
- the return electrode 12 is an electrode to which the high-frequency electric field applied from the probe 11 to the phase change recording medium 20 returns, and is provided so as to surround the probe 11. In addition, as long as the high-frequency electric field returns to the return electrode 12 without resistance, its shape and arrangement can be arbitrarily set.
- a voltage corresponding to the recorded data is applied to the resistor 14 of the probe 11 and the heat generated thereby changes the surface of the phase change material 16 from crystalline to amorphous. It is done by changing to.
- an AC signal is applied to the phase change material 16 of the phase change recording medium 20, and the capacity C determined by the crystalline and amorphous state of the phase change material 16 is obtained. This is done by detecting s. That is, there is a difference in the nonlinear dielectric constant between the crystalline and amorphous phases of the phase change material 16, and the capacitance Cs changes in accordance with the difference in the nonlinear dielectric constant. Data is reproduced by detecting the change in the capacitance Cs.
- SNDM nonlinear dielectric constant microscope
- a means for applying a voltage corresponding to the recording data to the resistor 14 includes, for example, a heater 38, an AC signal generator 32 for generating an AC signal to be applied, and detection of the capacitance Cs.
- an oscillator 31 that oscillates at a resonance frequency determined by the capacitance C s and the inductance L of the inductor 19.
- the oscillation frequency of the oscillator 31 is FM-modulated by a change in the capacitance C s corresponding to the crystalline or amorphous dielectric constant of the phase-change material 16, and this oscillation signal is FM-demodulated to make it crystalline and amorphous.
- the quality, ie, recorded data, is detected.
- the point (part) at which voltage is applied to the resistor 14 is defined as the point (part) at which the tip of the probe 11 generates sufficient heat.
- both ends of the diameter of the resistor 14 near the tip are preferable points (parts).
- the recording / reproducing head 1 since the recording / reproducing head 1 includes the recording resistor 14 and the reproducing recording / reproducing electrode 11a, it is possible to perform recording / reproducing simultaneously. Note that, as shown in FIG.
- the change material 16 is provided on the substrate 15, and an insulating thin film 17 is formed on the surface of the phase change material 16.
- the data is recorded on the phase change material or the data recorded on the phase change material is reproduced using the SNDM technique.
- the recording density can be greatly increased, and high-quality recording and reproduction of data can be realized.
- the original SNDM is known as a means for electrically detecting the polarization state of the ferroelectric material.
- the linear dielectric constant or the nonlinear dielectric constant of the phase change material differs depending on the difference between crystalline and amorphous phase change materials, and this difference in the dielectric constant was detected by SNDM.
- a new regeneration principle is adopted. As a result, data recorded on the phase change recording medium can be clearly distinguished depending on the difference between the crystalline and amorphous properties of the phase change material, and the data can be reproduced with high quality.
- the phase change material is heated using a micro tip equivalent to or larger than that used for the cantilever of the AFM, so that only a very small area of the phase change material can be heated. it can. As a result, it is possible to realize ultra-high-density recording that cannot be realized with a conventional optical disk system.
- the heating portion of the probe according to the present embodiment is extremely small and has a small heat capacity, so that the recording response speed is high, and a practically sufficient recording response speed can be secured.
- FIG. 2A is a plan view of this embodiment
- FIG. 2B is a cross-sectional view taken along line A2-A2 in FIG. 2A.
- the recording / reproducing head 2 includes a probe 11 composed of a support member 11 b and a resistor 14 provided at the tip of the support member 11 b, and a probe 11 1 And a return electrode 12 provided around it.
- the probe 11 is provided on a support member 11 b made of an insulating member having a tip portion, that is, a portion facing the phase change material 16 having a substantially spherical shape with a predetermined radius, and a support member 11 b. And a resistor 14 having a predetermined specific resistance.
- the tip of the probe 11 facing the phase change material 16 of the phase change recording medium 20 has a radius of 10 nm order. Very small. Further, the probe 11 has a needle shape, a cantilever shape or the like.
- the return electrode 12 is an electrode from which the high-frequency electric field applied to the phase change recording medium 20 from the probe 11 returns, and is provided so as to surround the probe 11. In addition, as long as the high-frequency electric field returns to the return electrode 12 without resistance, its shape and arrangement can be arbitrarily set.
- a voltage corresponding to the recorded data is applied to the resistor 14 of the probe 11 and the heat generated thereby changes the surface of the phase change material 16 from crystalline to amorphous. It is done by changing to. Note that the entire recording surface of the phase change material 16 is set to be crystalline as an initial state.
- an AC signal is applied to the phase change material 16 of the phase change recording medium 20, and the capacity C determined by the crystalline and amorphous state of the phase change material 16 is determined. This is done by detecting s. That is, the difference in nonlinear dielectric constant between the crystalline and amorphous phase change materials 16 is large, and the capacitance Cs changes in accordance with the difference in nonlinear dielectric constant. Data is reproduced based on the change in the capacity Cs.
- a means for applying a voltage corresponding to the recording data to the resistor 14 includes, for example, a heater 38, an AC signal generator 32 for generating an AC signal to be applied, and detection of the capacitance Cs.
- an oscillator 31 that oscillates at a resonance frequency determined by the capacitance C s and the inductance L of the inductor 19.
- the oscillation frequency of the oscillator 31 is FM-modulated by a change in the capacitance C s corresponding to the crystalline or amorphous dielectric constant of the phase-change material 16, and this oscillation signal is FM-demodulated to make it crystalline and amorphous.
- the quality, ie, recorded data is detected. Note that the resistance component of the resistor 14 is added to the oscillation circuit, and the level of the oscillation signal is reduced.
- the resistor 14 of the recording / reproducing head 2 is used as a heater electrode for recording and an electrode for reproducing, it is necessary to switch the signal applied to the resistor 14 during recording and reproducing. Yes, the switching is performed by SW1 and SW2, for example. That is, the circuit is switched by setting SW 1 and SW 2 to the heater 38 side during recording, and setting SW 1 to the oscillator side and opening SW 2 during reproduction.
- the phase change material 16 of the phase change recording medium 20 is initially crystalline and unified.
- the probe 11 is positioned at a portion to be recorded, and a voltage is applied to the resistor 14.
- the resistor 14 generates heat due to the applied voltage, and changes the phase change material 16 at that portion from crystalline to amorphous.
- the heat generation of the resistor 14 can be changed in accordance with the data.
- a heating operation corresponding to the data is executed while the recording / reproducing head 2 is relatively scanned with respect to the phase change recording medium 20.
- phase change material 16 changes according to the data, and the phase change material 16 forms a crystalline and amorphous arrangement corresponding to the data.
- data is recorded on the phase change material.
- Such a recording operation is performed using the probe 11 having a tip with a radius of the order of 10 nm, so that the data recording density can be greatly improved.
- an AC signal is applied to the phase change material 16 of the phase change recording medium 20.
- An inductor 19 having an inductance L is provided between the recording / reproducing electrode 11 a and the return electrode 12, and the inductor 19 and the crystalline or amorphous material immediately below the probe 11 are provided.
- the capacitance C s corresponding to the dielectric constant forms a resonance circuit.
- the oscillation signal based on the resonance frequency is FM-modulated by the capacitance Cs corresponding to the crystalline or amorphous dielectric constant.
- the FM-modulated signal is subjected to FM demodulation to discriminate between crystalline and amorphous, and the data is reproduced. If SNDM is used, it is possible to distinguish between crystalline and amorphous with a high sN ratio, so that high-quality data reproduction is realized.
- the recording device 3 includes a recording / reproducing electrode 11 a, an insulating layer 13 provided at the tip of the recording / reproducing electrode 11 a, and a resistor provided on the insulating layer 13.
- a probe 11 comprising a body 14; a recording / reproducing head 1 provided with a return electrode 12 provided around the probe 11; and a heater 32 for applying a voltage to the resistor 14; Generate data to be recorded
- the recording signal generator 39 is provided. A signal corresponding to the data generated by the recording signal generator 39 is input to the heater 32.
- the entire recording surface of the phase change material 16 of the phase change recording medium 20 is initialized to be crystalline.
- the heater 32 heats the resistor 14 based on the signal from the recording signal generator 39 and the heat generated by the resistor 14 changes the phase change recording medium.
- the 20 phase change material 16 is made amorphous.
- the probe 11 is in contact with the phase-change recording medium 20 or is scanned facing the other with a small space, and the phase-change material 16 contains heat in the crystal due to the heat generated by the resistor 14.
- Amorphous is formed as data.
- the recording signal generator 39 generates data to be recorded, and the data is converted in a predetermined recording format, and is subjected to processing related to control information, error correction, data compression, and the like. May be included.
- the recording and reproducing head 2 may be used in place of the recording and reproducing head 1.
- SW 1 and SW 2 are connected to the heater 38 side, and a voltage corresponding to data to be recorded on the resistor 14 is applied to heat the resistor 14.
- the reproducing device 4 includes a recording / reproducing electrode 11 a, an insulating layer 13 provided at the tip of the recording / reproducing electrode 11 a, and a resistor provided on the insulating layer 13.
- the recording / reproducing head 1 includes a probe 11 composed of a probe 14 and a return electrode 12 provided around the probe 11. Further, the reproducing device 4 includes an inductor 19 provided between the recording / reproducing electrode 11 a of the probe 11 and the return electrode 12, and a phase change material 16 immediately below the inductor 19 and the probe 11.
- An oscillator 31 that oscillates at a resonance frequency determined by a capacitance C s corresponding to a crystalline or amorphous dielectric constant; an AC signal generator 32 that generates an AC signal applied to a phase change material 16; An FM demodulator 33 that demodulates an oscillating signal modulated by a capacitance Cs according to the crystalline or amorphous dielectric constant, and a signal detector 34 that reproduces data from the demodulated signal are provided. I have.
- the probe 11 contacts the phase change material 16 of the phase change recording medium 20 or faces the phase change material 16 with a small space.
- the phase change recording medium 20 has a crystalline or amorphous region formed corresponding to the radius of the tip of the probe 11. And crystalline or amorphous The quality areas correspond to the data.
- the capacitance Cs corresponding to the crystalline or amorphous dielectric constant of the phase change material 16 at the tip of the probe 11 is added to the resonance circuit with the inductor 19, so that the oscillation frequency is reduced by the capacitance C will depend on s.
- the detection voltage shown in FIG. 3 is output, and the recorded data is reproduced.
- the AC signal generator 32 generates an AC signal to be applied to the phase change material 16 of the phase change recording medium 20. This AC signal is also used as a reference signal when reproducing data from the FM demodulated signal.
- the inductor 19 is provided between the recording / reproducing electrode 11a and the return electrode 12, and is formed, for example, by a microstrip line.
- a resonance circuit is formed by the inductance L of the inductor 19 and the capacitance C s.
- phase change recording medium 20 for example, a GeI 1 SbTe-based phase change material, which is a eutectic material, is used.
- shape of the phase change recording medium 20 include a disk form and a card form. Movement of the relative position with respect to the probe 11 is performed by rotation of the medium, or one of the probe 11 and the medium is moved linearly.
- the oscillator 31 is an oscillator that oscillates at a frequency determined by the inductance L and the capacitance Cs.
- the oscillation frequency changes according to the change in the capacitance C s, and thus corresponds to the change in the capacitance C s determined by the crystalline or amorphous dielectric constant corresponding to the recorded data.
- FM modulation is performed.
- the recorded data can be read by demodulating this FM modulation.
- the FM demodulator 33 demodulates the oscillation frequency of the oscillator 31 modulated by the capacitance Cs, and obtains the data recorded corresponding to the crystalline or amorphous portion traced by the probe 11. Restore the waveform. This is done by FM demodulating the frequency that is modulated according to the recorded data.
- the signal detection section 34 reproduces recorded data based on the signal demodulated by the FM demodulator 33 and the applied AC signal from the AC signal generator 32. Same for signal playback It is possible to use a method based on period detection, a method based on phase detection, or the like. As a means for synchronous detection, for example, a mouth-in amplifier can be used.
- the reproducing apparatus 4 of the present embodiment it is possible to detect whether crystalline or amorphous corresponding to the data formed on the phase change material 16 of the phase change recording medium 20. And data with a good SN ratio is reproduced.
- the recording and reproducing head 2 may be used in place of the recording and reproducing head 1.
- SW 1 is connected to the oscillator 31 side, and SW 2 is open.
- a first embodiment of the recording / reproducing apparatus according to the present invention will be described with reference to FIG.
- the details of the operation and operation of each component of the recording / reproducing device 5 are the same as those described for the recording device 3 and the reproducing device 4, and will be appropriately referred to.
- the recording / reproducing device 5 includes a recording / reproducing electrode 11a, an insulating layer 13 provided at the tip of the recording / reproducing electrode 11a, and a resistor provided on the insulating layer 13. It has a probe 11 composed of a body 14 and a recording / reproducing head 1 having a return electrode 12 provided around the probe 11. Further, the recording / reproducing device 5 includes a heater 38 for applying a voltage to the antibody 14 to overheat as a recording system, and a recording signal generator 39 for generating a signal input to the heater 38.
- the recording / reproducing device 5 includes, as a reproducing system, an inductor 19 provided between the recording / reproducing electrode 11 a of the probe 11 and the return electrode 12, and a phase immediately below the inductor 19 and the probe 11.
- An oscillator 31 that oscillates at a resonance frequency determined by a capacitance C s according to the crystalline or amorphous dielectric constant of the phase change material 16 and an AC signal that generates an AC signal applied to the phase change material 16
- a signal corresponding to the data to be recorded is generated by the recording signal generator 39 and input to the heater 38.
- a voltage is applied from the heater 38 to the resistor 14 of the probe 11, and the resistor 14 is heated to generate heat. Due to this heat, the phase change material 16 of the phase change recording medium 20 changes from crystalline to amorphous, and data is recorded.
- the read operation is recorded corresponding to the crystalline or amorphous phase change material 16 The data is determined by distinguishing between crystalline and amorphous.
- An AC signal from an AC signal generator 32 is applied to the phase change material 16 of the phase change recording medium 20.
- a resonance circuit is formed by the inductance L of the inductor 19 and the capacitance C s corresponding to the crystalline or amorphous dielectric constant, and the oscillator 31 oscillates at the frequency of the resonance circuit.
- the oscillation signal is FM-modulated by the capacitor C s and demodulated by the FM demodulator 33.
- the demodulated signal reproduces the recorded data based on the AC signal from the AC signal generator 32 in the signal detector 34.
- the recording / reproducing apparatus 6 of this embodiment has a recording system and a reproducing system as separate functions due to the structure of the recording / reproducing head 1 used, and performs the reproducing operation while performing the recording operation. It is possible to check the recording state of the recorded data while performing the recording.
- a second embodiment of the recording / reproducing apparatus according to the present invention will be described with reference to FIG.
- the details of the operation and operation of each component of the recording / reproducing device 6 are the same as those described for the recording device 3 and the reproducing device 4, and will be appropriately referred to.
- the recording / reproducing device 6 includes a probe 11 composed of a support member lib and a resistor 14 provided at the front end of the support member lib, and a probe 11 provided around the probe 11.
- a recording / reproducing head 2 having a return electrode 12 is provided.
- the recording / reproducing device 6 includes a heater 38 for applying a voltage to the resistor 14 to overheat as a recording system, and a recording signal generator 39 for generating a signal to be input to the heater 38.
- the recording / reproducing device 6 includes, as a reproducing system, an inductor 19 provided between the resistor 14 of the probe 11 and the return electrode 12, and a phase change material 1 immediately below the inductor 19 and the probe 11.
- An oscillator 31 that oscillates at a resonance frequency determined by the capacitance C s according to the crystalline or amorphous dielectric constant of 6, and an AC signal generator 3 that generates an AC signal applied to the phase change material 16 2, an FM demodulator 33 that demodulates an oscillating signal that is modulated by a capacitance Cs according to the crystalline or amorphous dielectric constant, a signal detector 3 that reproduces data from the demodulated signal, etc. It has.
- SW1 and SW2 are connected to the heater 38 side, respectively, and a signal corresponding to data to be recorded generated by the recording signal generator 39 is input to the heater 38.
- a voltage is applied from the heater 38 to the resistor 14 of the probe 11, and the resistor 14 is heated to generate heat. Due to this heat, the phase change material 16 of the phase change recording medium 20 changes from crystalline to amorphous, and data is recorded.
- SW 1 is connected to the oscillator 31 side, and SW 2 is opened so that the resistor 14 is connected to the inductor 19 and the oscillator 31. Therefore, the AC signal generated by the AC signal generator 32 is applied to the phase change material 16 of the phase change recording medium 20.
- Reproduction of the recorded data is performed by determining whether the phase change material 16 is crystalline or amorphous.
- An AC signal from an AC signal generator 32 is applied to the phase change material 16 of the phase change recording medium 20.
- a resonance circuit is formed by the inductance L of the inductor 19 and the capacitance C s corresponding to the crystalline or amorphous dielectric constant, and the oscillator 31 oscillates at the frequency of the resonance circuit.
- the oscillation signal is FM-modulated by the capacitor C s and demodulated by the FM demodulator 33.
- the demodulated signal reproduces the recorded data based on the AC signal from the AC signal generator 32 in the signal detector 34.
- the recording / reproducing head, the recording apparatus, the reproducing apparatus, and the recording / reproducing apparatus according to the present invention employ a scanning nonlinear dielectric microscopy (SNDM) or the like as a technology capable of realizing high-density and large-capacity recording.
- the present invention can be used for a recording / reproducing head for recording and reproducing data on a recording medium, and for a recording apparatus, a reproducing apparatus, and a recording / reproducing apparatus to which the recording / reproducing head is applied.
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Description
Claims
Priority Applications (3)
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US10/555,239 US20070014047A1 (en) | 2003-05-01 | 2004-04-27 | Recording/reproduction head and recording/reproduction device |
GB0522313A GB2415827B (en) | 2003-05-01 | 2004-04-27 | Recording/reproducing head and recording/reproducing apparatus |
JP2005505909A JP4274571B2 (ja) | 2003-05-01 | 2004-04-27 | 記録再生ヘッド及び記録再生装置 |
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JP2003126319 | 2003-05-01 | ||
JP2003-126319 | 2003-05-01 |
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WO2004097822A1 true WO2004097822A1 (ja) | 2004-11-11 |
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US (1) | US20070014047A1 (ja) |
JP (1) | JP4274571B2 (ja) |
CN (1) | CN1784729A (ja) |
GB (1) | GB2415827B (ja) |
WO (1) | WO2004097822A1 (ja) |
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- 2004-04-27 US US10/555,239 patent/US20070014047A1/en not_active Abandoned
- 2004-04-27 GB GB0522313A patent/GB2415827B/en not_active Expired - Fee Related
- 2004-04-27 CN CNA2004800118506A patent/CN1784729A/zh active Pending
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Also Published As
Publication number | Publication date |
---|---|
GB0522313D0 (en) | 2005-12-07 |
GB2415827A (en) | 2006-01-04 |
CN1784729A (zh) | 2006-06-07 |
JP4274571B2 (ja) | 2009-06-10 |
GB2415827B (en) | 2006-08-30 |
US20070014047A1 (en) | 2007-01-18 |
JPWO2004097822A1 (ja) | 2006-07-13 |
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