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Multicomponent Magnetic Thin Films

IP.com Disclosure Number: IPCOM000093703D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Flur, BL: AUTHOR [+2]

Abstract

A wide range of magnetic properties of the type finding application in magnetic thin-film storage devices is provided with multicomponent nickel-iron alloys that include copper, chromium, molybdenum, manganese and aluminum additions. Thin films formed from these alloys, because of their compositional complexity, are most readily prepared by bias sputtering as described by B.L. Flur, Intermag. Conf. Proceedings 2.4-1, Washington, D.C. 1965.

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Multicomponent Magnetic Thin Films

A wide range of magnetic properties of the type finding application in magnetic thin-film storage devices is provided with multicomponent nickel-iron alloys that include copper, chromium, molybdenum, manganese and aluminum additions. Thin films formed from these alloys, because of their compositional complexity, are most readily prepared by bias sputtering as described by B.L. Flur, Intermag. Conf. Proceedings 2.4-1, Washington, D.C. 1965.

To bias sputter the alloys, having the composition presented in the table, metallographically polished two-inch square plates of silver-copper alloy, with overlayers of chromium and silicon monoxide, are used as substrates. A schematic of the electrical sputtering circuit required is shown. A potential of - 2000 volts is impressed between cathode and anode with a cathode current of about 110 milliamperes. A bias potential of -150 volts is applied to the substrate for 15 seconds after the start of deposition. A bombarding medium, such as argon, is injected into the sputtering chamber. Uniaxial anisotropy is induced in these films with a DC magnetic field of 25 oersteds applied parallel to the plane of the condensing film. Under these conditions the alloys are deposited at a rate in the range between 6 Angstroms to 7 Angstroms per second.

As a result of measurements of wall motion threshold H, anisotropy field H(ko), and dispersion alpha 90, and skew beta, of the easy axis, made with a 60 cycle...