Reversible magnetization behavior in Sm2(Co, Fe, Cu, Zr)17

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Abstract
The magnetization of Sm 2 (Co, Fe, Cu, Zr) 17 is determined by the motion of domain boundary walls that are subject to pinning. Measurements have been made of the relationship between the reversible magnetization M rev and the irreversible magnetization M irr components in Sm 2 (Co, Fe, Cu, Zr) 17 . The results are consistent with a model in which rapid nucleation of domain walls occurs at the beginning of magnetization reversal followed by gradual unpinning of the domain walls. For Sm 2 (Co, Fe, Cu, Zr) 17 the parameter η, defined as η=(dM rev /dM irr ) H is similar in form to previously observed variations of η in sintered NdFeB but very different from η variations due to Stoner–Wohlfarth coherent rotation of magnetization vectors.

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