公开(公告)号：DE2707692A1

公开(公告)日：1977-09-01

申请号：DE2707692

申请日：1977-02-23

Applicant: IBM

Inventor： AINSLIE NORMAN GEORGE ,  HEMPSTEAD ROBERT DOUGLAS ,  TAN SWIE-IN ,  VALSTYN ERICH PHILIPP

IPC: C22C38/00 ,  C23C14/40 ,  G11B5/147 ,  G11B5/31 ,  H01F10/14 ,  H01F41/14 ,  H01F41/18 ,  C23C15/00

Abstract: Iron-silicon is sputtered onto a substrate to be used for a magnetic recording head from a target containing 4% to 7% of silicon with a substrate bias between -2.5 and -60 volts, anode-cathode spacing of about 1/2 to about 2 inches, a deposition rate of greater than 150A/min, a substrate temperature above 250 DEG C, an argon pressure above 10 microns, and a single film thickness greater than 0.4 micron, a laminated film thickness greater than 0.05 micron, and R.F. input power above 8 watts/in2.

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.