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Diminishing Transient Growth Effects in LPE Bubble Domain Films

IP.com Disclosure Number: IPCOM000082397D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Davies, JE: AUTHOR [+3]

Abstract

Magnetic garnet films are conveniently grown from a supersaturated flux melt onto nonmagnetic garnet substrates by liquid phase epitaxy (LPE) dipping methods which are well known. The instant that a substrate is immersed in the melt there exists a short transient period, the duration of which decreases with increasing substrate rotation rate, before steady-state growth conditions are attained.

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Diminishing Transient Growth Effects in LPE Bubble Domain Films

Magnetic garnet films are conveniently grown from a supersaturated flux melt onto nonmagnetic garnet substrates by liquid phase epitaxy (LPE) dipping methods which are well known. The instant that a substrate is immersed in the melt there exists a short transient period, the duration of which decreases with increasing substrate rotation rate, before steady-state growth conditions are attained.

During this transient, growth is rapid, being limited only by the kinetics of the surface integration process. After this the growth rate decays to its steady-state value as the concentration boundary layer approaches its equilibrium thickness, the magnitude of which is stabilized by the substrate rotation in a horizontal plane. Typically the transient period lasts for approximately two seconds or less, during which time approximately 0.1 micron of film is grown.

Since film composition depends on the growth rate, it is expected that the composition of the transient layer will differ from that of the steady-state grown film. Although the transient effect is essentially insignificant for films supporting 5 micron bubble domains, it becomes increasingly important as the film thickness is decreased for small bubble applications.

In order to minimize the effects of the transient layer, it is proposed to diminish the volume of material representing the transient by slowing down the initial growth rate by at least an ...