Article comprising magnetoresistive material
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United States of America Patent
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Aug 27, 1996
Issued Date -
N/A
app pub date -
Apr 15, 1994
filing date -
Nov 18, 1993
priority date (Note) -
Expired
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Abstract
A magnetoresistance ratio of 200% (absolute value) or more at room temperature in a field of 6T can be achieved in a layer of material of nominal composition XMnO.sub.y (X is La and at least one of Ca, Sr and Ba, y in the range 2-3.5), if, after formation of the layer, the layer is heat treated in an oxygen-rich (O.sub.2 partial pressure greater than that of air) atmosphere, typically in flowing O.sub.2. The temperature and duration of the heat treatment are in the range 300.degree.-850.degree.C. and 10 minutes-12 hours, and are selected to result in the desired ratio of 200% or more.
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