公开(公告)号：US3437577A

公开(公告)日：1969-04-08

申请号：US3437577D

申请日：1967-06-26

Applicant: IBM

Inventor： KAY ERIC ,  SAWATZKY ERICH

IPC: C23C14/00 ,  H01F41/18 ,  C23C15/00 ,  B44D1/44 ,  C23D13/00

CPC classification number: H01F41/186 ,  C23C14/0036

公开(公告)号：US3607698A

公开(公告)日：1971-09-21

申请号：US3607698D

申请日：1968-10-11

Applicant: IBM

Inventor： KAY ERIC ,  SAWATZKY ERICH

IPC: C23C14/08 ,  H01F10/24 ,  H01F41/18 ,  C23C15/00

CPC classification number: C23C14/08 ,  H01F10/24 ,  H01F41/186

Abstract: A method of making improved garnet thin films in a sputtering apparatus. The film is sputtered from a source containing yttrium or rare earth garnet in bulk form onto a garnet substance. Epitaxial films with square hysteresis loops are obtained only when the garnet substrate is in the (111) orientation.

公开(公告)号：JPH06259739A

公开(公告)日：1994-09-16

申请号：JP1612494

申请日：1994-02-10

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 ,  G11B19/04

Abstract: PURPOSE: To improve the file performance by supporting a magnetoresistive sensor on the rear end of a carrier put on a liquid bearing at the time of bring ing a magnetic recording transducer into contact with a magnetic recording disk during the read or write operation to make a disk file or a disk drive. CONSTITUTION: A transducer carrier 20 consists of a liquid bearing 50 provided on a disk 16 and a magnetic read/induction write head 42 provided on a rear end 44. A magnetic read sensor 60 and an induction write head 62 are formed as thin film layers on the rear end of the carrier 20, and an end part 61 of the sensor 60 is placed between shields 62 and 63 arranged apart from each other. An induction write head 70 constituting the head 42 consists of a coil 73 and a recording gap 75 and is oriented to the surface of the disk 16. The part 61 of the sensor 60 is brought into contact with a liquid bearing 50 provided on the disk 16, and head design is made free so as to be suitable for write because it is unnecessary for the head 70 to read data recorded on the magnetic layer of the disk 16.

公开(公告)号：JP2788600B2

公开(公告)日：1998-08-20

申请号：JP1612494

申请日：1994-02-10

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 ,  G11B19/04

公开(公告)号：DE1765644A1

公开(公告)日：1971-08-12

申请号：DE1765644

申请日：1968-06-25

Applicant: IBM

Inventor： KAY ERIC ,  SAWATZKY ERICH

IPC: C23C14/00 ,  H01F41/18 ,  C23C15/00

Abstract: 1,156,768. Sputtered films of rare earth iron garnets. INTERNATIONAL BUSINESS MACHINES CORP. May 28, 1968 [June 26, 1967], No. 25422/68. Heading C7F. A film of a rare earth iron garnet is produced by sputtering a garnet source on to a substrate maintained below 50‹ C in an atmosphere having a partial pressure of oxygen of at least 10%, and then crystallizing the deposited film. The rare earth iron garnets have the formula M 3 Fe 3 O 12 where M is one of the rare earths and to ensure that the deposited garnet has the same formula the source cathode must be kept at a temperature below the vaporization temperature of the garnet. The substrate should have a thermal expansion coefficient between 80 x 10 -7 /‹ C to 130 x 10 -7 /‹ C and suitable substrates are single crystal quartz, magnesium oxide or the same garnet as that being deposited. The sputtered film is crystallized by heating to 700‹ -1100‹ C in an oxygen atmosphere or in a vacuum. The sputtering is carried out with a 50 watt R. F. oscillator and RF power amplifier at a frequency of 13À56 megacycles/sec. A magnetic field perpendicular to the target is superposed by a set of Helmboltz coils outside the vacuum chamber.

公开(公告)号：DE69330256T2

公开(公告)日：2001-10-11

申请号：DE69330256

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MUSA ,  FOSTER STUART ,  LAM K ,  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：CA2102087C

公开(公告)日：1998-11-24

申请号：CA2102087

申请日：1993-10-29

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：DE69330256D1

公开(公告)日：2001-06-28

申请号：DE69330256

申请日：1993-11-24

Applicant: IBM

Inventor： DOVEK MUSA ,  FOSTER STUART ,  LAM K ,  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：AT201524T

公开(公告)日：2001-06-15

申请号：AT94901867

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：HU216673B

公开(公告)日：1999-08-30

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: G11B5/00 ,  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.