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公开(公告)号：CA1338255C
公开(公告)日：1996-04-23
申请号：CA570086
申请日：1988-06-22
Applicant: SONY CORP
Inventor： HAYASHI KAZUHIKO , HAYAKAWA MASATOSHI , KATORI KENJI , ASO KOICHI
Abstract: Disclosed is a soft magnetic thin film having a basic composition of FeCoNi or FeCoDy which is specified for use as a single layer film for increasing the saturation magnetic flux density and the coercive force. The soft magnetic properties are achieved by laminating the above defined soft magnetic thin film as the first soft magnetic thin film layer with a second magnetic thin film layer. In this case, crystal structures of the first and the second soft magnetic thin films should appropreately be selected and combined.
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公开(公告)号：DE3780317T2
公开(公告)日：1993-03-04
申请号：DE3780317
申请日：1987-01-23
Applicant: SONY CORP
Inventor： HAYAKAWA MASATOSHI , NAGAKI TAKEHIRO , ASO KOICHI , YAMANOI HIROSHI
IPC: G11B11/105 , G11B11/10
Abstract: A device for producing a high frequency modulating magnetic field is disclosed. The device is especially useful to achieve real-time overwriting in magneto-optical recording. The device produces magnetic field modulated according to a signal to be recorded on a magneto-optical recording medium (61) in which the signal is recorded in the form of magnetization direction on the magneto-optical recording medium (61) under irradiation of a laser beam to raise the temperature of the medium (61). The device comprises a main magnetic pole (2) formed of a low-loss soft magnetic material and having one end facing to the magneto-optical recording medium (63) and a sheathed conductor (5) wound around the main magnetic pole (2) and consisting of a parallel connection of a plurality of insulated elementary wires (5).
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公开(公告)号：DE69024137D1
公开(公告)日：1996-01-25
申请号：DE69024137
申请日：1990-08-30
Applicant: SONY CORP
Inventor： HAYASHI KAZUHIKO , HAYAKAWA MASATOSHI , ASO KOICHI
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公开(公告)号：DE68925045D1
公开(公告)日：1996-01-25
申请号：DE68925045
申请日：1989-02-20
Applicant: SONY CORP
Inventor： HAYASHI KAZUHIKO , OKABE AKIHIKO , HAYAKAWA MASATOSHI , ASO KOICHI
Abstract: A magnetic thin film having a composition represented by the following formula: (CoaPtbBcMd)100-xOx wherein a, b, c, d and x represent atomic percents of respective elements and satisfy relationships expressed as a = 100 - b - c - d 0
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公开(公告)号：DE69013281T2
公开(公告)日：1995-05-24
申请号：DE69013281
申请日：1990-08-28
Applicant: SONY CORP
Inventor： HAYASHI KAZUHIKO , OKABE AKIHIKO , HAYAKAWA MASATOSHI , ASO KOICHI
Abstract: A magnetic recording medium having a magnetic thin film of a composition expressed as (Coa Ptb Mc Md ) 100-x Ox (where a, b, c, d are atomic percent; and x is weight percent). In this composition, a + b + c + d = 100, 0 is at least one element selected from P, Si and Ge; and M is at least one element selected from B, Ga, Al, In, Sn and Sb. Such magnetic thin film is capable of retaining a large coercive force regardless of its thickness and can be formed without the necessity of raising the base temperature during deposition of a magnetic layer.
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Patent Agency Ranking6.发明专利
公开(公告)号：CA1280207C
公开(公告)日：1991-02-12
申请号：CA527570
申请日：1987-01-21
Applicant: SONY CORP
Inventor： HAYAKAWA MASATOSHI , NAGAKI TAKEHIRO , ASO KOICHI , YAMANOI HIROSHI
IPC: G11B11/105 , G11B13/04
Abstract: A device for producing a high frequency modulating magnetic field is disclosed. The device is especially useful to achieve real-time overwriting in magneto-optical recording. The device produces magnetic field modulated according to a signal to be recorded on a magneto-optical recording medium in which the signal is recorded in the form of magnetization direction on the magneto-optical recording medium under irradiation of a laser beam to raise the temperature of the medium. The device comprises a main magnetic pole formed of a low-loss soft magnetic material and having one end facing to the magneto-optical recording medium and a sheathed conductor wound around the main magnetic pole and consisting of a parallel connection of a plurality of insulated elementary wires.
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公开(公告)号：CA1278770C
公开(公告)日：1991-01-08
申请号：CA486890
申请日：1985-07-16
Applicant: SONY CORP
Inventor： HAYAKAWA MASATOSHI , ASO KOICHI , OCHIAI YOSHITAKA , MATSUDA HIDEKI , HAYASHI KAZUHIKO , ISHIKAWA WATARU , IWASAKI YOU
Abstract: A magnetic alloy thin film consisting essentially of a first Fe-Al-Si or Fe-Ni alloy thin film of high permeability and a second Fe-Si alloy thin film directly formed on the first thin film and having high saturation magnetic flux density. The ratio in thickness of the first and second films is preferably in the range of from 1:0.1 to 2.
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公开(公告)号：CA1175685A
公开(公告)日：1984-10-09
申请号：CA388301
申请日：1981-10-20
Applicant: SONY CORP
Inventor： MAKINO YOSHIMI , OCHIAI YOSHITAKA , UEDAIRA SATORU , HOTAI KAZUHIDE , ASO KOICHI , HAYAKAWA MASATOSHI
Abstract: A process for manufacturing an amorphous alloy involves thermally treating or annealing the amorphous alloy material at a temperature lower than the crystallization temperature thereof through rotation of the alloy material relative to a magnetic field at a velocity so as to meet the relation as follows: R?O = 0. 5n where R is a number of rotation, ?O is an average time required to reach the amorphous alloy material to a thermal equilibrium state of induced magnetic anisotropy; and n is a natural number The amorphous alloy thus prepared possesses a high permeability and a high saturated magnetic flux so that it is suitable as a soft magnetic core material such as magnetic heads.
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公开(公告)号：DE69024137T2
公开(公告)日：1996-08-29
申请号：DE69024137
申请日：1990-08-30
Applicant: SONY CORP
Inventor： HAYASHI KAZUHIKO , HAYAKAWA MASATOSHI , ASO KOICHI
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公开(公告)号：DE3880048D1
公开(公告)日：1993-05-13
申请号：DE3880048
申请日：1988-08-25
Applicant: SONY CORP
Inventor： OCHIAI YOCHITAKA , ASO KOICHI , HASHIMOTO SYUNICHI
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