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Magnetic anneal anisotropy in amorphous alloys

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2 Author(s)
Luborsky, F. ; General Electric Company, Schenectady, NY, USA ; Walter, John L.

The uniaxial magnetic anisotropy Kuinduced by a magnetic anneal has been determined, after stress relief, for a series of alloys given by (FeyNi1-y)80B20. For all of these alloys Kudepends on anneal temperature as predicted by directional order theory. The concentration dependence of Kuin these alloys is also consistent with directional order theory. The maximum Ku, corrected for its temperature dependence, occurs at the compositiony = 0.5. However, Kudoes not fall to zero aty = 1as predicted if directional order is assumed to arise only from Fe-Ni pair ordering. These results are interpreted as suggesting a role of the glass former, boron, in the directional ordering, perhaps as an "interstitial." The interaction energy derived from the results is negative as expected for interactions leading to precipitation. Its large value ofapprox -7.5 times 10^{-14}ergs corresponds to a critical temperature for precipitation of 3000 K.

Published in:

Magnetics, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

Mar 1977

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