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GdFeAg, an Amorphous Bubble Domain and Magneto Optic Material

IP.com Disclosure Number: IPCOM000083598D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Heiman, N: AUTHOR [+2]

Abstract

The ternary alloy GdFeAg, an amorphous material suitable for bubble domain and magneto-optic device use, has been prepared by thermal evaporation. A preferred embodiment is Gd(0.17)Fe(0.80)Ag(0.03). The general formula is [Gd(1-x)Fe(x)](1-y)Ag(y) where x is between 0.45 to 0.70 and Ag is between 0.01 to 0.1.

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GdFeAg, an Amorphous Bubble Domain and Magneto Optic Material

The ternary alloy GdFeAg, an amorphous material suitable for bubble domain and magneto-optic device use, has been prepared by thermal evaporation. A preferred embodiment is Gd(0.17)Fe(0.80)Ag(0.03). The general formula is [Gd(1-x)Fe(x)](1-y)Ag(y) where x is between 0.45 to 0.70 and Ag is between 0.01 to 0.1.

These films are prepared by the simultaneous thermal evaporation of each of the metal constituents in a ultrahigh frequency (UHF) system with a typical base pressure of 7-10 x 10/-9/ torr. Deposition rates of 1-5 Angstroms/sec at 5 x 10/- 8/ to 5 x 10/-7/ torr are utilized. The deposition is on fused quartz substrates which have been precooled and which are maintained at 0 degrees C.

A film of Gd(0.17)Fe(0.80)Ag(0.03) is ideal for magneto-optical devices. The specific properties which make this film attractive for use in magneto-optical devices are: T(c) approx. = to 180 degrees C - low enough for thermomagnetic writing with GaAs lasers, but high enough for data integrity. H(c) (ambient) approx. = to 0.5 kOe.

(Image Omitted)

2 Theta (F) (ambient) approx = to 6.2 x 10/5/ deg/cm. Remanence = 100% from ambient to above +150 degrees C. Figure of merit (2 Theta (F)/alpha) >1 deg (@
0.6328 micron).

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