Low-permeability high-strength target material for the formation

Details Low-permeability high-strength target material for the formation Low-permeability high-strength target material for the formation

1992-06-02

1994-08-16

Walsh, Donald P.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

148301, 420 83, 428694RE, B22F 900

Patent

active

053383311

ABSTRACT:
A high-strength target material for forming a thin magnetooptical recording film having a structure comprising: (a) 20-75% of a complex phase in which at least one crystallized iron-group metal is dispersed finely and uniformly in a dendritic, acicular or block form in a proportion of 5-40%, of the total composition, in a matrix of an intermetallic compound of at least one first rare earth metal and at least one iron-group metal; (b) 15-40% of a rare earth metal phase of at least one second rare earth metal; and (c) the remainder being an intermetallic compound phase of a reaction phase of the complex phase and the rare earth metal phase, all percentages being by area, wherein the first and second rare earth metals are the same or different. The target material has such a low permeability that thin magnetooptical recording films can be formed by a magnetron sputtering process with a high utilization.

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