公开(公告)号：CH600476A5

公开(公告)日：1978-06-15

申请号：CH543876

申请日：1976-04-30

Applicant: IBM

Inventor： RIGBEY LEONARD JOHN ,  WALLIS CHRISTOPHER NORMAN

IPC: G11B21/02 ,  G11B5/55 ,  G11B21/24 ,  G11B17/06

公开(公告)号：AU1510776A

公开(公告)日：1978-01-05

申请号：AU1510776

申请日：1976-06-21

Applicant: IBM

Inventor： RIGBEY LEONARD JOHN ,  WALLIS CHRISTOPHER NORMAN

IPC: G11B21/02 ,  G11B5/55 ,  G11B21/24 ,  G11B21/10

公开(公告)号：GB1190939A

公开(公告)日：1970-05-06

申请号：GB5351666

申请日：1966-11-30

Applicant: IBM

Inventor： VALSTYN ERICH PHILIPP ,  WALLIS CHRISTOPHER NORMAN

IPC: G01R31/01 ,  H01F10/06

Abstract: 1,190,939. Magnetic data storage apparatus. INTERNATIONAL BUSINESS MACHINES CORP. 28 June, 1967 [30 Nov., 1966], No. 53516/66. Heading H3B. In a data store uniaxial anisotropic magnetic thin film material is supported on a non- magnetic conductive layer, e.g. of copper, coated on a magnetic, preferably ferromagnetic, substrate. The printed digit/sense lines of the store are connected at one end to the copper layer, which acts as a return conductor, and it is stated that the use of a thin layer reduces the noise induced in the sense line due to eddy currents flowing in the layer after a write operation. The ferromagnetic layer may also be thin and may in turn be carried by a conductive substrate of copper or molybdenum. The substrate in each case acts as a heat sink. It is stated that noise reduction increases with an increase in permeability and a decrease in conductivity of the material beneath the conductive layer, and that there is an optimum thickness for the copper layer of the order of 17 microns.