公开(公告)号：DE3176238D1

公开(公告)日：1987-07-09

申请号：DE3176238

申请日：1981-07-23

Applicant: IBM DEUTSCHLAND ,  IBM

Inventor： HINKEL HOLGER DR ,  KUNZEL ULRICH DR ,  MAX ERHARD DR ,  SCHNEIDER JOCHEN

IPC: G11B5/73 ,  G11B5/84 ,  G11B5/82

Abstract: A substrate for a magnetic recording disk employs an annular core of synthetic material having thin metal foils bonded to opposite faces, the metal foils serving to receive a magnetic recording material to form a magnetic recording structure. The inner surfaces of foils which are bonded to the core faces have applied thereto a thin, soft, deformable layer such as copper to prevent irregularities in the core faces from affecting the outer surfaces of the metal foils.

公开(公告)号：DE3068214D1

公开(公告)日：1984-07-19

申请号：DE3068214

申请日：1980-09-06

Applicant: IBM DEUTSCHLAND ,  IBM

Inventor： FROSCH ALBERT ,  HINKEL HOLGER DR ,  KRAUS GEORG ,  KUNZEL ULRICH DR ,  ROGALLA DIETRICH DR ,  SCHNEIDER JOCHEN

IPC: B32B5/28 ,  B32B5/22 ,  B32B33/00 ,  G11B5/62 ,  G11B5/73 ,  G11B5/733 ,  G11B5/82 ,  G11B5/70 ,  H01F10/28

Abstract: 1. A magnetic disk substrate comprising a laminate of thin plastic lamellae (L1, L2, ..., LK), characterized in that said lamellae are reinforced by fibers (2) aligned in parallel to each other, that said anisotropic lamellae are arranged on top of each other at angular distances that are as large as possible, ranging from 0 to 60 degrees, and that the density of the outer lamellae is lower than that of the inner lamellae.

公开(公告)号：DE2851771B1

公开(公告)日：1980-04-17

申请号：DE2851771

申请日：1978-11-30

Applicant: IBM DEUTSCHLAND

Inventor： TRIPPEL GERHARD DIPL-PHYS DR ,  BRUNSCH ARWED DIPL-PHYS DR ,  RUH WOLF-DIETER ,  SCHNEIDER JOCHEN

IPC: G01R33/18

Abstract: Direct method for measuring the magnetostriction constant lambda s of soft magnetic and isotropic magnetic materials. A thin film sample is cantilevered and clamped at one edge. Under the influence of a magnetic AC field and the magnetostriction effect of the sample material, the free end of the cantilevered sample is deflected and oscillates with twice the frequency of the AC field. The resonance amplitude ares is measured by using a laser beam impinging upon the oscillating sample and measuring the reflected beam amplitude by means of a position-sensitive photodiode. The AC output signal of the photodiode is proportional to the sample amplitude. The magnetostriction constant lambda s is directly proportional to the resonance amplitude ares multiplied by a constant factor which depends on known geometry and properties of the sample material.

公开(公告)号：DE2354506A1

公开(公告)日：1975-05-07

申请号：DE2354506

申请日：1973-10-31

Applicant: IBM DEUTSCHLAND

Inventor： SCHNEIDER JOCHEN

IPC: G11B5/55 ,  G11B5/60 ,  G11B5/82 ,  G11B5/72 ,  G11B5/58

Abstract: Magnetic disc with special ridges on which magnetic pick-up heads rest during non operation and lifts due to air layer build up during rotation of the disc, is so arranged that the carrier ridges are higher than the data traces and that the traces-ridges are situated alternatively and adjacent to each other. A pick up arm carries the supports with magnetic heads and is adjustable to reach the required ridges. The cutting tool for the ridges is so arranged that the cuttings are picked off during the cutting procedure. The raw surface is then covered with a magnetic layer.

公开(公告)号：CA1187174A

公开(公告)日：1985-05-14

申请号：CA404019

申请日：1982-05-28

Applicant: IBM

Inventor： HINKEL HOLGER ,  KUENZEL ULRICH ,  MAX ERHARD ,  SCHNEIDER JOCHEN

IPC: G11B5/73 ,  G11B5/84 ,  G11B5/14

Abstract: MAGNETIC DISK SUBSTRATE WITH A CORE OF SYNTHETIC MATERIAL A magnetic disk substrate consists of a core of synthetic material which on both sides is covered with metal foils. The preferably used steel foils have a thickness between 10.mu.m and 300.mu.m, and with their material properties determine the surface micro-hardness as well as the peak to valley height. Onto these surfaces the actual magnetic layer is applied. This magnetic disk substrate is made either through molding under the influence of heat, or through foaming of the space between the two metal foils in a suitable mold.

公开(公告)号：DE2827870A1

公开(公告)日：1980-01-10

申请号：DE2827870

申请日：1978-06-24

Applicant: IBM DEUTSCHLAND

Inventor： SCHNEIDER JOCHEN ,  TRIPPEL GERHARD DIPL PHYS DR ,  BRUNSCH ARWED DIPL PHYS DR ,  RUH WOLF-DIETER DIPL ING

IPC: G11B5/70 ,  G11B5/706 ,  G11B5/02 ,  G11B5/62

Abstract: Magnetic recording carrier as described in the parent patent has a magnetic material (I) with anisotropy perpendicular to the recording surface and a relatively high coercivity of ca. 50-400 Oe, recording/play-back taking place by vertical relative movement between the magnetic head and the carrier. Improvement is that there is a layer of soft magnetic material (II), which has a high magnetisation and a magnetisation direction in the plane of the carrier, between the substrate (III) and (I). Pref. (II) consists of Ni81Fe19 "Fermalloy" (RTM) alloy, amorphous Fe80B2o, amorphous Co74Fe6B2o or an AlFeSi alloy. In particular, Co78.8Fe6.4B14.8 is used as (II) in conjunction with Co6oGd4o as (I). Layers of (I) and (II) are pref. formed on both sides of (III). (II) increases the stray field strength needed for readout and also avoids the possibility of distortion.

公开(公告)号：AT27663T

公开(公告)日：1987-06-15

申请号：AT81105823

申请日：1981-07-23

Applicant: IBM

Inventor： HINKEL HOLGER DR ,  KUENZEL ULRICH DR ,  MAX ERHARD DR ,  SCHNEIDER JOCHEN

IPC: G11B5/73 ,  G11B5/84 ,  G11B5/82

公开(公告)号：DE2961717D1

公开(公告)日：1982-02-18

申请号：DE2961717

申请日：1979-10-31

Applicant: IBM

Inventor： TRIPPEL GERHARD DR ,  BRUNSCH ARWED DR ,  RUH WOLF-DIETER ,  SCHNEIDER JOCHEN

IPC: G01R33/18

Abstract: Direct method for measuring the magnetostriction constant lambda s of soft magnetic and isotropic magnetic materials. A thin film sample is cantilevered and clamped at one edge. Under the influence of a magnetic AC field and the magnetostriction effect of the sample material, the free end of the cantilevered sample is deflected and oscillates with twice the frequency of the AC field. The resonance amplitude ares is measured by using a laser beam impinging upon the oscillating sample and measuring the reflected beam amplitude by means of a position-sensitive photodiode. The AC output signal of the photodiode is proportional to the sample amplitude. The magnetostriction constant lambda s is directly proportional to the resonance amplitude ares multiplied by a constant factor which depends on known geometry and properties of the sample material.

公开(公告)号：DE2146008A1

公开(公告)日：1973-03-22

申请号：DE2146008

申请日：1971-09-15

Applicant: IBM DEUTSCHLAND

Inventor： SCHNEIDER JOCHEN ,  STOFFEL AXEL DR

IPC: H01F41/20 ,  C23C14/00 ,  H01F10/18 ,  C23C13/02

公开(公告)号：CA1172154A

公开(公告)日：1984-08-07

申请号：CA382162

申请日：1981-07-21

Applicant: IBM

Inventor： FROSCH ALBERT ,  HINKEL HOLGER ,  KRAUS GEORG ,  KUNZEL ULRICH ,  ROGALLA DIETRICH ,  SCHNEIDER JOCHEN

IPC: B32B5/28 ,  B32B5/22 ,  B32B33/00 ,  G11B5/62 ,  G11B5/73 ,  G11B5/733 ,  G11B5/82 ,  B32B5/26

Abstract: The invention provides a magentic disk substrate of plastic containing fibres in which the substrate is pressed in the form of a laminate from a plurality of thin lamellae of fibre reinforced plastic, which are arranged on top of each other at equal angular spacing.