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A Method of Making Thin Films Having Low Dispersion

IP.com Disclosure Number: IPCOM000096705D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Freedman, JF: AUTHOR [+2]

Abstract

This is a method of evaporating single crystal thin films having almost no anisotropy dispersion without introducing skew.

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A Method of Making Thin Films Having Low Dispersion

This is a method of evaporating single crystal thin films having almost no anisotropy dispersion without introducing skew.

In the (111) plane of a cubic crystal, the first order crystalline anisotropy is a constant, 1/4 K(1), regardless of direction in the plane. The second order anisotropy has the form E = (K(2)/108) sin 60.

For magnetic materials, such as permalloy, this is very much smaller than the uniaxial anisotropy. So, in a uniaxial, single crystal magnetic film with (111) orientation, crystalline effects are negligible. Crystalline effects being negligible, there is almost no anisotropy dispersion and no skew is introduced.

One method of growing single crystal films of nickel or permalloy with (111) orientation is to evaporate a layer of silver onto a fresh cleavage face of mica at about 270 degrees C. Then, the nickel or permalloy is evaporated onto the silver at the same temperature.

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