公开(公告)号：DE69534614D1

公开(公告)日：2005-12-22

申请号：DE69534614

申请日：1995-09-19

Applicant: SONY CORP

Inventor： SUZUKI ATSUSHI ,  HAYAKAWA MASATOSHI ,  MATSUNAGA TORU ,  TAMARU TAKASHI ,  URAI AKIRA

IPC: G11B5/133 ,  G11B5/187 ,  G11B5/193 ,  G11B5/255

Abstract: A magnetic head having a pair of magnetic core halves integrally bonded to each other, each magnetic core half being formed by a single-crystal ferrite piece and a polycrystal ferrite piece bonded together to constitute a junction ferrite, with a magnetic gap being defined between abutting surfaces of the magnetic core halves. The single-crystal ferrite pieces are arranged towards the abutting surfaces of the magnetic core halves and the polycrystal ferrite pieces are arranged on the opposite side of the abutting surfaces with respect to the single-crystal ferrite pieces. Preferably, the surface of the single-crystal ferrite piece having sliding contact with the magnetic recording medium, the gap surface of the single-crystal ferrite piece and the surface of the single-crystal ferrite piece corresponding to the lateral surface of the magnetic head are the (211) plane, (111) plane and the (110) plane, respectively. The directions of the &lang&100&rang& crystal axes within the plane (100) are symmetrical to each other on both sides of the magnetic gap. The magnetic head is low in sliding noise and superior in electro-magnetic conversion characteristics. In addition, the magnetic recording medium is superior in abrasion characteristics since the partial advancing abrasion is prohibited from occurring on its surface configured to have sliding contact with the magnetic recording medium.

公开(公告)号：DE69419367T2

公开(公告)日：2000-01-27

申请号：DE69419367

申请日：1994-04-28

Applicant: SONY CORP

Inventor： KUMAGAI SEIJI ,  HONDA JUNICHI ,  ITO YOSHITOMO ,  HAYAKAWA MASATOSHI ,  MATSUNAGA TORU ,  YORIZUMI MINEO ,  IKEDA YOSHITO

IPC: G11B5/127 ,  G11B5/133 ,  G11B5/23 ,  G11B5/187

Abstract: A magnetic head having a pair of magnetic cores defining a magnetic gap in-between is disclosed. The side of each magnetic core facing a recording medium is formed of a single-crystal ferrite, with the remaining portions of each magnetic core being formed of poly-crystal ferrite. The surface of the magnetic core facing the recording medium and the abutment surface of the magnetic core are the {100} plane and the {100} plane of the single-crystal ferrite, respectively. The magnetic head has excellent abrasion resistance and electro-magnetic conversion characteristics.

公开(公告)号：NL1004587A1

公开(公告)日：1998-05-27

申请号：NL1004587

申请日：1996-11-21

Applicant: SONY CORP

Inventor： KUMAGAI SEIJI ,  HAYAKAWA MASATOSHI ,  MORITA HORISHI ,  FUJISAWA NORIKATSU ,  HONDA JUNICHI ,  NAKANO YUJI

IPC: G11B5/008 ,  G11B5/53 ,  G11B33/12 ,  G11B5/52

公开(公告)号：DE69122816T2

公开(公告)日：1997-05-15

申请号：DE69122816

申请日：1991-08-20

Applicant: SONY CORP

Inventor： SUGIYAMA YASUNARI ,  OHMORI HIROYUKI ,  HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI

IPC: G11B5/33 ,  G11B5/39 ,  G11B5/02

Abstract: A magnetic head comprises a substrate (2), a soft magnetic thin film (1), whose magnetic permeability varies according to the intensity of an external magnetic field applied thereto, formed over the surface of the substrate, means (10a-10e) for supplying a high-frequency current to the soft magnetic thin film, and means (5) for applying a bias magnetic field to the soft magnetic thin film. The magnetic permeability of the soft magnetic thin film varies according to the variation of the intensity of the external magnetic field and hence the potential difference between the opposite ends of the soft magnetic thin film with respect to the direction of flow of the high-frequency current varies accordingly. The variation of the potential difference is detected (11) for magnetic signal reading. The soft magnetic thin film is formed of a material having a large magnetic permeability, such as amorphous CO75Ta11Zr14.

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

IPC: G11B5/64 ,  G11B5/66 ,  G11B5/73 ,  G11B5/85

公开(公告)号：DE3681056D1

公开(公告)日：1991-10-02

申请号：DE3681056

申请日：1986-04-10

Applicant: SONY CORP

Inventor： HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  ISHIKAWA WATARU ,  IWASAKI YOU ,  ASO KOUICHI

IPC: H01F10/14 ,  H01F10/16

Abstract: Disclosed is a soft magnetic thin film which has superior soft magnetic characteristics and high saturation magnetic flux density. The magnetic thin film is formed by physical vapour deposition process and composed of Fe, Ga, and Si with optional inclusion of Co, Ru, or Cr.

公开(公告)号：DE3803303A1

公开(公告)日：1988-08-18

申请号：DE3803303

申请日：1988-02-04

Applicant: SONY CORP

Inventor： KUMURA TATSUO ,  SATO HEIKICHI ,  KUNITO YOSHIYUKI ,  IKEDA YOSHITO ,  IZU ETSUO ,  HAYAKAWA MASATOSHI

IPC: G11B5/235 ,  G11B5/127 ,  G11B5/187 ,  G11B5/23 ,  H01F10/14 ,  G11B5/31

公开(公告)号：DE3023604A1

公开(公告)日：1981-01-15

申请号：DE3023604

申请日：1980-06-24

Applicant: SONY CORP

Inventor： MAKINO YOSHIMI ,  HAYAKAWA MASATOSHI ,  ASO KOICHI ,  UEDAIRA SATORU ,  ITO SHIGEYASU ,  HOTAI KAZUHIDE

IPC: C22F1/00 ,  C21D1/04 ,  C22C45/04 ,  H01F1/153 ,  C21D8/12

Abstract: 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.

公开(公告)号：DE3021224A1

公开(公告)日：1980-12-18

申请号：DE3021224

申请日：1980-06-04

Applicant: SONY CORP

Inventor： UEDAIRA SATORU ,  ITO SHIGEYASU ,  ASO KOICHI ,  HAYAKAWA MASATOSHI

IPC: C22F1/00 ,  C21D6/00 ,  C22C19/07 ,  C22C45/04 ,  C22F1/10 ,  H01F1/153 ,  C21D8/02

公开(公告)号：DE69534614T2

公开(公告)日：2006-07-27

申请号：DE69534614

申请日：1995-09-19

Applicant: SONY CORP

Inventor： SUZUKI ATSUSHI ,  HAYAKAWA MASATOSHI ,  MATSUNAGA TORU ,  TAMARU TAKASHI ,  URAI AKIRA

IPC: G11B5/133 ,  G11B5/187 ,  G11B5/193 ,  G11B5/255

Abstract: A magnetic head having a pair of magnetic core halves integrally bonded to each other, each magnetic core half being formed by a single-crystal ferrite piece and a polycrystal ferrite piece bonded together to constitute a junction ferrite, with a magnetic gap being defined between abutting surfaces of the magnetic core halves. The single-crystal ferrite pieces are arranged towards the abutting surfaces of the magnetic core halves and the polycrystal ferrite pieces are arranged on the opposite side of the abutting surfaces with respect to the single-crystal ferrite pieces. Preferably, the surface of the single-crystal ferrite piece having sliding contact with the magnetic recording medium, the gap surface of the single-crystal ferrite piece and the surface of the single-crystal ferrite piece corresponding to the lateral surface of the magnetic head are the (211) plane, (111) plane and the (110) plane, respectively. The directions of the &lang&100&rang& crystal axes within the plane (100) are symmetrical to each other on both sides of the magnetic gap. The magnetic head is low in sliding noise and superior in electro-magnetic conversion characteristics. In addition, the magnetic recording medium is superior in abrasion characteristics since the partial advancing abrasion is prohibited from occurring on its surface configured to have sliding contact with the magnetic recording medium.