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Eliminating "Mesa" Defects in Dipped LPE Magnetic Bubble Domain Films

IP.com Disclosure Number: IPCOM000080857D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Giess, EA: AUTHOR [+3]

Abstract

The structures termed "mesas", are plateau-shaped thickness discontinuities on films grown by LPE (liquid phase epitaxy) dipping. These mesas are caused by continued film growth in droplets of fluxed melt retained on a film surface, after it has parted from the growth melt.

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Eliminating "Mesa" Defects in Dipped LPE Magnetic Bubble Domain Films

The structures termed "mesas", are plateau-shaped thickness discontinuities on films grown by LPE (liquid phase epitaxy) dipping. These mesas are caused by continued film growth in droplets of fluxed melt retained on a film surface, after it has parted from the growth melt.

In the method described herein, mesa defects are eliminated from magnetic bubble films grown by the isothermal LPE dipping technique which employs horizontal substrates undergoing axial rotation, as described in the publication of Giess, Kuptsis and White, Journal of Crystal Growth 16 36 (1972).

In the usual mode of growth, the horizontal-plane substrates part from the (horizontal) melt surface, instantaneously leaving a centrally located droplet of melt on the film surface. By tilting the LPE growth furnace and dipping apparatus about 5 degrees away from a vertical line, the substrates part from the melt surface at an angle (approx. 5 degrees). Thus, the surface tension of the melt causes the meniscus to strip melt away from the film to the lower edge of the film.

In this connection, it has been found that it is better to stop the axial rotation of the substrate, just prior to raising the substrate out of the melt to ensure smooth parting. Also, the substrate should not be removed from the melt too rapidly. By rapid (at least 500 rpm) rotation, the last drop of melt is spun off the film edge just after it parts from the mel...