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：DE69219224T2

公开(公告)日：1997-10-16

申请号：DE69219224

申请日：1992-06-11

Applicant: IBM

Inventor： ALBRECHT THOMAS R ,  FOSTER JOHN STUART ,  HOMOLA ANDREW MARIAN

IPC: G11B21/21 ,  G11B25/04

Abstract: Described is a transducer assembly for use in a disk file which provides substantially reduced head-disk spacing and a corresponding improvement in recording performance. The assembly includes a transducer carrier with feet which ski on a high viscosity liquid film with which the disk is coated. Also described is a disk file incorporating such a transducer assembly.

公开(公告)号：DE69021284T2

公开(公告)日：1996-04-18

申请号：DE69021284

申请日：1990-05-21

Applicant: IBM

Inventor： ARNETT PATRICK CLINTON ,  BRYANT ANDRES ,  FOSTER JOHN STUART ,  FROMMER JANE ELIZABETH ,  IWATA JON ASAO CARY

IPC: G01Q60/00 ,  G03F1/00 ,  G03F7/20 ,  H01J37/317 ,  H01L21/027 ,  H01L21/30

Abstract: A high resolution lithographic mask having a desired pattern is generated and used to replicate the pattern onto a film in a one-step process. A film of phase-changeable material in one state is provided on a conductive substrate. By scanning tunneling microscope techniques, the state and thereby the conductivity or other property of the material in selected areas (a min -c min ) of the film is changed to a second state to provide from the film a mask (19) having a desired pattern defined by crystalline areas. Amorphous material need not be removed from the mask. To replicate the pattern on another film (16), the latter is placed on another conductive substrate (17); the mask is positioned (21p-21r) with its patterned side within electron tunneling distance (19p-19r) of said other film; and the pattern is replicated in a single step by applying a voltage between the mask and other film. The voltage charge on said mask is positive and negative on said other film to cause current to flow in the crystalline areas of said mask and, by electron flow from said film to the mask, eliminate backscattering and insure high resolution. As the state changes (e.g., from crystalline to amorphous) in the pattern areas of said other film, conductivity in the crystalline areas will progressively decrease and, by causing a corresponding reduction in current flow in the crystalline areas, minimize the risk of undesired broadening of exposed areas of said other film.

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.

公开(公告)号：DE69021284D1

公开(公告)日：1995-09-07

申请号：DE69021284

申请日：1990-05-21

Applicant: IBM

Inventor： ARNETT PATRICK CLINTON ,  BRYANT ANDRES ,  FOSTER JOHN STUART ,  FROMMER JANE ELIZABETH ,  IWATA JON ASAO CARY

IPC: G01Q60/00 ,  G03F1/00 ,  G03F7/20 ,  H01J37/317 ,  H01L21/027 ,  H01L21/30

Abstract: A high resolution lithographic mask having a desired pattern is generated and used to replicate the pattern onto a film in a one-step process. A film of phase-changeable material in one state is provided on a conductive substrate. By scanning tunneling microscope techniques, the state and thereby the conductivity or other property of the material in selected areas (a min -c min ) of the film is changed to a second state to provide from the film a mask (19) having a desired pattern defined by crystalline areas. Amorphous material need not be removed from the mask. To replicate the pattern on another film (16), the latter is placed on another conductive substrate (17); the mask is positioned (21p-21r) with its patterned side within electron tunneling distance (19p-19r) of said other film; and the pattern is replicated in a single step by applying a voltage between the mask and other film. The voltage charge on said mask is positive and negative on said other film to cause current to flow in the crystalline areas of said mask and, by electron flow from said film to the mask, eliminate backscattering and insure high resolution. As the state changes (e.g., from crystalline to amorphous) in the pattern areas of said other film, conductivity in the crystalline areas will progressively decrease and, by causing a corresponding reduction in current flow in the crystalline areas, minimize the risk of undesired broadening of exposed areas of said other film.

公开(公告)号：DE68916567D1

公开(公告)日：1994-08-11

申请号：DE68916567

申请日：1989-02-15

Applicant: IBM

Inventor： FOSTER JOHN STUART ,  RUBIN KURT ALLAN ,  RUGAR DANIEL

IPC: G01Q60/00 ,  G11B9/00 ,  G11B9/14

Abstract: A method for recording, reading and erasing data bits in a data storage device is described. Using extended scanning tunnelling microscopy (STM) techniques, a tunnelling electron current by resistive heating selectively melts discrete areas of a state-transformable film; then heat is dissipated rapidly, writing data bits by changing the film in the areas from a first state to a second state wherein an electronic property, such as conductance, work function or band gap, in the areas is changed. Again, using extended STM techniques, the effect of this changed electronic property of the film on the tunnelling current is measured for reading the written data bits. Minimising the effect of blemishes on the material is effected, during operation in STM constant current mode by measuring dI/dV or dI/ds, and during operation in STM variable current (constant gap) mode by measuring (dI/dV)/I or (dI/ds)/I. Also, by using extended STM techniques, data bits can be selectively erased by resistance heating the film to a temperature higher than the crystallisation temperature for a sufficient period of time, restoring selected discrete areas to the first state and each affected electronic property substantially to its original condition.