The unidirectional exchange anisotropy field H/sub ex/ was investigated in NiFe/FeMn films. It was found that the H/sub ex/ is proportional to t/sub NiFe//sup -1.2/ for 30 /spl Aring//spl les/t/sub NiFe//spl les/400 /spl Aring/ where t/sub NiFe/ is the NiFe film thickness. For t/sub NiFe/=30 /spl Aring/, H/sub ex/ was measured to be 800 Oe in some samples. NiFe/FeMn structures on alumina underlayers were also studied; their presence reduces the strength of the anisotropy significantly.
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Kim et al. (1995) studied this question.
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