Sony Corporation

Shigeyasu Ito

Satoru Uedaira

Yoshimi Makino

Koichi Aso

Masatoshi Hayakawa

Hidemasa Tamura

Kazuhide Hotai

A method of manufacturing a high permeability amorphous magnetic alloy is disclosed. In the method amorphous magnetic alloy ribbon prepared by quenching a melt of raw material is annealed at an elevated temperature lower than a crystallization temperature of the alloy, in a magnetic field. During the annealing, the alloy ribbon and the direction of the magnetic field are relatively rotated with each other. The method is especially useful to an amorphous magnetic alloy having high saturation magnetic induction where the magnetic Curie temperature of the alloy usually exceeds the crystallization temperature of the alloy.

Method of manufacturing an amorphous magnetic alloy

A method of manufacturing an high permeability amorphous magnetic alloy is disclosed. In the method, an amorphous alloy ribbon is annealed at an elevated temperature T(.degree.K.) satisfying the relation 0.95.times.Tc (.degree.K.).ltoreq.T(.degree.K.)&lt;Tcry(.degree.K.) where Tc is a magnetic Curie temperature and Tcry is a crystallization temperature of the alloy. Then the ribbon is quenched to a room temperature from the elevated temperature. The quenched amorphous alloy ribbon is again annealed at a temperature between 100.degree. C. and 250.degree. C. By the method, the amorphous magnetic alloy shows a high permeability over a wide frequency range and flat frequency response characteristics of permeability over a wide frequency range.

Method of manufacturing a high permeability amorphous magnetic alloy

A method of manufacturing an amorphous alloy in which a molten mixture of raw materials making up the amorphous alloy is first prepared, and then introduced between a pair of oppositely rotating rolls where the molten material is rolled and quenched into a film. The conditions under which the rolling and quenching occur are carried out under the following conditions: ##EQU1## where: Y is the roll pressure per unit width of the film in metric tons per centimeter,

Method of manufacturing an amorphous alloy

An amorphous magnetic alloy consists of 2 to 20 at % (atomic percent) of ruthenium atoms; 10 to 30 at % of atoms of at least one amorphous forming element selected from the group consisting of phosphorus, carbon, silicon, boron and germanium; and iron atoms as the predominant component of the balance.

Amorphous magnetic alloy

A method of making a substantially ordered alloy which involves providing a metal base consisting of at least one of the ingredients of the desired alloy, depositing a thin metal layer on the base, the metal layer containing the remaining constituents of the desired alloy, and heating the metal base and the deposited metal layer at a temperature below the order-disorder transformation temperature of the ordered alloy to be formed to thereby cause the ordered alloy to be produced by diffusion.

Method of making an ordered alloy

Magnetic alloy containing platinum, cobalt and nickel is disclosed which is suitable for use with magnetic recording medium, especially for use with an intermediate magnetic recording medium in thermo and magneto printing.

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Yokohama, Japan

Shigeyasu Ito