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Magnetic Garnet Layering

IP.com Disclosure Number: IPCOM000080876D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Cronemeyer, DC: AUTHOR

Abstract

Magnetic garnet layering is achieved in garnet films by variations in rotation rate during liquid phase epitaxy (LPE) growth.

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Magnetic Garnet Layering

Magnetic garnet layering is achieved in garnet films by variations in rotation rate during liquid phase epitaxy (LPE) growth.

If Eu:Ga:YIG LPE films are grown from-an appropriate melt, the uniaxial anisotropy field H(u) depends strongly upon the rotation rate (IBM Technical Disclosure Bulletin Vol. 16, No. 9, February 1974, Pages 3082 and 3083). The magnetic moment 4 pi M(s) also depends upon the rotation rate, as shown in Fig. 1. Hence, the ratio q = H(u)/4 pi M(s) also depends upon the rotation rate. Since q > 1 is desirable for stable bubble domains in a film, the film q can be controlled by adjustment of the rotation rate. Thus, in a layered structure as shown in Fig. 2, where q(2) > q(1), region 2 adjacent to a substrate would support bubbles whereas region 1 thereon would not. Hard bubbles would be suppressed, since the capping layer allows the "twisted" wall to unwind.

A structure can be fabricated as shown in Fig. 3, wherein a normal film is bounded by top and bottom layers which would not support bubbles. A condition might be attained by slow rotation where the magnetization lies in the plane. Further multilayer films can be fabricated as shown in Fig. 4, where the bias conditions for layers 2 and 4 may (a) differ appreciably or (b) be essentially the same.

With (a) an assembly of small bubbles in 2 could coexist with an assembly of larger bubbles in 4 (or vice versa). With (b) the same diameter bubbles would coexist in regions 2...