Disclosed is a temperature sensitive amorphous magnetic alloy which shows a Curie point of not higher than 200 DEG C. and whose composition is represented by the formula: (M1-a Nia)100-z Xz wherein M=Co or Fe; X=at least one of P, B, C and Si; 0.2/=a/=0.8 when M is Co, or 0.4/=a/=0.9 when M is Fe; and 15/=z/=30.
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