JPS59123762A - Laminated material for magnetic head - Google Patents

Abstract

PURPOSE:To obtain a laminated material for a magnetic head preventing a loss due to an eddy current by heating a laminated material of an Ni-Fe alloy having an Al layer between layers to a specified temp. to form an insulating layer of Al2O3 between the layers. CONSTITUTION:The surface of a thin Ni-Fe alloy plate is coated with an Al layer by vapor deposition or other method, and laminating and rolling are carried out to obtain a laminated material having an Al layer between layers. The laminated material is heated to 750-1,300 deg.C, preferably 1,000-1,300 deg.C to form an insulating layer of Al2O3 between the layers. The thickness of the Al layer is regulated to <=1/10 times the thickness of the Ni-Fe alloy plate, and it is preferable to heat the laminated material in an atmosphere of wet gaseous hydrogen with <=0 deg.C, preferably <=-40 deg.C dew point. The core of a magnetic head can be formed accurately by using the resulting laminated material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a laminated material for a magnetic head suitable as a helad core.

[Technical background of the invention and its problems j The core of a magnetic head has conventionally been formed of a single thin plate made of a ferromagnetic material such as a Ni-Fe alloy, or a core that is required to have better characteristics. In this case, it is known that a plurality of (2 to 6) thin plates are laminated.

In the core of this laminated structure, is it necessary to insulate the layers of the laminated material in order to prevent eddy currents? Conventionally, this insulation method has been carried out by the following method.

That is, first, a thin plate of Ni-Fe base metal was pressed into the desired shape, magnetically annealed, and then a plurality of these thin plates were bonded together using an organic adhesive and laminated with C, and interlayer insulation was achieved. It is difficult to layer well,
It was also complicated.

For this reason, it is possible to solve this problem by punching a laminated material that has been interlayer-insulated and integrated into a desired shape, or by adding an organic insulator between the Ni and e alloys. During the magnetic annealing after punching, the organic insulator deteriorates and decomposes, and the bad performance of the C insulation disappears. In order to determine whether there would be any problem of decomposition or deterioration of the insulator during heating during annealing, inorganic insulators were
The disadvantage is that it is difficult to roll when inserted between layers of alloy.

Purpose of the Invention 1 The Ministry of the Invention and others have carried out intensive research to eliminate such drawbacks, and as a result, we have found that when heat treating a Ni-Fc metal laminated material with a Δρ diagram formed between the layers, A. Q layer melts, some parts △
It was found that β203 was obtained and insulation was achieved between the layers.

The present invention was made based on such knowledge, and N
The object of the present invention is to provide a laminated material for a magnetic head that is insulated from gold alloy.

[Summary of the Invention] In other words, the laminated material for a magnetic head of the present invention has
It is characterized in that a laminated material in which an A°C layer is formed between i-Fe alloy plates is heated at 750-1300'C to form an insulating layer between the layers.

In the present invention, a laminate of N1-e alloy plates with an A2 layer formed between the layers is manufactured, for example, as follows.

The A2 layer is coated on the surface of a Ni-Fe alloy thin plate by heat deposition, PVD (physical vapor deposition), or CVD (chemical vapor deposition), and multiple layers are stacked with the AJ2 layer between the layers. rolled, or A1 layer is tightly shielded between a few N-Fe alloy thin plates and rolled at high temperature, or A2
It is obtained by cladding the layers by casting and rolling.

Note that the thickness of the A°C layer in the laminated material is set to 1/10 or less of the thickness of the Ni-Fe alloy plate. If this value is exceeded, the magnetic properties will deteriorate significantly.

Next, the laminated material thus obtained is heated to activate -C, which combines with oxygen in the material or in the atmosphere to form an insulating layer of 8β203 in the living room. Note that, before this heat treatment, the punched material into a desired shape will be magnetically annealed during this heat treatment.

The quality of heat treatment is 750-1300°C, preferably 10
00 to 1300'C, and the atmosphere during heating is preferably a wet hydrogen scum atmosphere with a dew point of 0°C or below, preferably -40°C or below. The heat treatment temperature was limited as mentioned above because the A2 layer does not melt below 750°C.
It is difficult to form ρ203, and 1300℃
If the dew point of the atmosphere is limited as described above, the n point becomes O'C'.
This is because if the value exceeds .

Example of E le Ming] Next, embodiments of the present invention will be explained.

Thin plate 2 of 81% N1-5.5% MOFe alloy with a thickness of 1 node
A β layer with a thickness of 0.05 μ was inserted between the sheets and rolled to produce a laminate with a thickness of about 0.6 mm. This is pressed into a predetermined shape using a punching press, and then the dew point is -4,
6 at 1050°C in a wet hydrogen gas atmosphere below 0'C.
Heat for 0 minutes.

An insulating layer of 8β203 was formed between the layers, and magnetic annealing was performed.

The thus obtained head core had improved magnetic permeability at high frequencies and reduced loss due to eddy currents.

[Effects of the Invention] As explained above, since the laminated material for a magnetic head of the present invention is an integrated laminated material with an insulating layer formed between the layers in advance, the head core can be formed with high precision. Head cores using laminated materials have less loss due to eddy currents.

Representative Patent Attorney Noriyuki Chika (1 other person)

Claims (1)

[Claims] <1) An insulating layer is formed between the laminated Ni-Fe alloy plates by heating the laminated material in which the A and C layers are formed at 750 to 1300°C. Features of laminated material for magnetic heads. (2) The thickness of the β layer is 1/1/1 of the thickness of the 1-Fe alloy plate.
10 or more, the laminated material for a magnetic head according to claim 1(p). (3) The laminated material for the air vent 1 according to claim 1 or 2, wherein the A and f2 layers are formed by the clan method. (4> A laminated material for a magnetic head according to claim 1 or 2, in which the AJ2 layer is formed by a PVD method or a CVD method. (5) A patent claim in which the heating temperature is 1000 to 1300°C. A magnetic spatula 1-set laminate material according to any one of the range No. 11 JIJ to No. 3.