公开(公告)号：DE2644688A1

公开(公告)日：1977-05-12

申请号：DE2644688

申请日：1976-10-02

Applicant: IBM

Inventor： KO WEN-CHUANG ,  SAWATZKY ERICH

IPC: G01R19/08 ,  G01Q30/02 ,  G01R31/302 ,  G01T1/29 ,  G21K5/04 ,  H01J37/04 ,  H01J37/244 ,  H01J37/317 ,  H01L21/265 ,  G01T1/16 ,  H01J3/08

公开(公告)号：DE2254900A1

公开(公告)日：1973-05-30

申请号：DE2254900

申请日：1972-11-09

Applicant: IBM

Inventor： SAWATZKY ERICH ,  STREET GEORGE BRYAN

IPC: C22C22/00 ,  C22C28/00 ,  H01F1/00 ,  H01F1/03 ,  H01F1/04 ,  H01F10/12 ,  H01F10/18 ,  C22C31/02

公开(公告)号：DE2248839A1

公开(公告)日：1973-05-30

申请号：DE2248839

申请日：1972-10-05

Applicant: IBM

Inventor： SUITS JAMES CARR ,  LEE KENNETH ,  SAWATZKY ERICH

IPC: C22C22/00 ,  C22C28/00 ,  C22C30/00 ,  G03G5/16 ,  H01F1/04 ,  H01F1/047 ,  H01F10/10 ,  H01F10/18 ,  C22C31/02

Abstract: 1396136 Ferromagnetic material; Vapour depositing or sputtering magnetic films INTERNATIONAL BUSINESS MACHINES CORP 2 Nov 1972 [26 Nov 1971] 50453/72 Headings C7A and C7F A ferromagnetic material consists of a mutual solid solution with atomic proportions indicated by the Formula:- or by the Formula:- The material is useful in data storage media as a thin film (e.g. on a non-magnetic substrate) which may be prepared by RF or D.C. sputtering or by vacuum deposition. The substrate, which may be of Al, glass or ceramic, in the form of a disc, strip or drum, may be kept at 25-420‹C during deposition, and the preferred deposition rate is 2-10Š per second.

公开(公告)号：DE1940640A1

公开(公告)日：1970-04-23

申请号：DE1940640

申请日：1969-08-09

Applicant: IBM

Inventor： KAY ERIC ,  SAWATZKY ERICH

IPC: C23C14/08 ,  H01F10/24 ,  H01F41/18 ,  B01J17/00

公开(公告)号：CZ290656B6

公开(公告)日：2002-09-11

申请号：CZ211595

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MORIS MUSA ,  FOSTER JOHN STUART ,  LAM DONALD K F ,  SAWATZKY ERICH

IPC: G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/58 ,  G11B5/60 ,  G11B20/10

Abstract: In the present invention there is disclosed a contact magnetic recording disk file utilizing a magnetoresistive MR sensor (60) for reading data recorded on the disk (16). The disk file may be of the liquid-bearing type of contact recording with the MR sensor (60) supported on the trailing end of a carrier (20), which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor (60) by the disk (16), with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor (60) may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier (20) in contact with the disk (16) surface may be selected to have a length less than the period of the disk (16) waviness so that it more closely follows the disk (16) surface topography.

公开(公告)号：CZ9502115A3

公开(公告)日：2002-05-15

申请号：CZ211595

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MORIS MUSA ,  FOSTER JOHN STUART ,  LAM DONALD K F ,  SAWATZKY ERICH

IPC: G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/58 ,  G11B5/60 ,  G11B20/10

Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.

公开(公告)号：SG45210A1

公开(公告)日：1998-01-16

申请号：SG1996001310

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MORIS MUSA ,  FOSTER JOHN STUART ,  LAM DONALD K F ,  SAWATZKY ERICH

IPC: G11B5/00 ,  G11B5/02 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/58 ,  G11B5/60 ,  G11B20/10

Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.

公开(公告)号：PL172763B1

公开(公告)日：1997-11-28

申请号：PL31017693

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MORIS MUSA ,  FOSTER JOHN STUART ,  LAM DONALD K F ,  SAWATZKY ERICH

IPC: G11B5/00 ,  G11B5/02 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/58 ,  G11B5/60 ,  G11B20/10

Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.

公开(公告)号：BG61541B1

公开(公告)日：1997-11-28

申请号：BG9987595

申请日：1995-08-18

Applicant: IBM

Inventor： DOVEK MORIS MUSA ,  FOSTER JOHN STUART ,  LAM DONALD K F ,  SAWATZKY ERICH

IPC: G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/58 ,  G11B5/60 ,  G11B20/10

Abstract: The device has a hard magnetic carrier and a magnetic resistance (MR) sensor for reading data recorded on the disk is used. The disk device can be of the type operating with a contact recording with liquid resting, the MR sensor being fitted to the resting end of a carrier running over the liquid resting layer. The operation of the device is improved by including facilities for the minimization of the modulation effect of the basic signal for reading. The modulation is caused by the alternating cooling of the thermosensitive and raising MR sensor in comparison with the disk, depending on the temperature, the temperature change being directly connected to the change of distance between the head and the disk, as a result of the disk ondulations. A filter for removing the modulation can be included in the circuit of the disk device for processing the already read signal, and the MR sensor can be made in such a way that it operates under specified parameters in order to minimize the effect of the basic modulation. The sector of the carrier which is in contact with the disk surface can be selected to have a length smaller than the period of the disk ondulations so that it may follow more closely the topography of the disk surface.

公开(公告)号：HU9502416D0

公开(公告)日：1995-10-30

申请号：HU9502416

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MORIS MUSA ,  FOSTER JOHN STUART ,  LAM DONALD K F ,  SAWATZKY ERICH

IPC: G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/58 ,  G11B5/60 ,  G11B20/10

Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.