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Hard magnetic properties of Sm-Co-Cu-Fe single phase 2-17 bulk samples

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2 Author(s)
H. Nagel ; Brown Boveri Research Center, Baden, Switzerland ; A. Menth

Sm(Co0.08Cu0.13)zalloys were prepared with 7.2 \leq z < 8 . Homogenization heat-treatment yielded single phase 2-17 material for z > 7.2 . For z = 7.8 some of the Co was substituted by Fe. The alloys remained single phase for up to 15 % Co substituted. With further increasing Fe content a Co-Fe phase appears accompanied by a strong decrease of the hard magnetic properties. The compounds were hard magnetic in bulk form with ideal rectangular hysteresis loops. The coercivity could be increased by a factor > 2 with a low temperature heat-treatment. BRvalues > 11 kG together withIHcvalues of about 4 kOe were achieved on single crystal samples. The coercivity mechanism in these materials is pinning of Bloch walls.

Published in:

IEEE Transactions on Magnetics  (Volume:12 ,  Issue: 6 )