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Anomalous temperature dependence of coercivity and reversal mechanism in bulk-hardened rare earth-cobalt magnets

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4 Author(s)
Gabay, A.M. ; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 ; Tang, W. ; Zhang, Y. ; Hadjipanayis, G.C.

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The “anomalous” nonmonotonic temperature dependence of coercivity, reported in Sm–Zr–Co–Cu magnets, has also been observed in bulk-hardened Y–Zr–Co–Fe–Cu alloys with a similar microstructure. The phenomenon appears to be universal for all R–Co magnets (R=rare earth) having a microstructure consisting of R2Co17 cells surrounded by the RCo5 phase. The effect of R and Cu on the temperature dependence of coercivity cannot be simply explained by traditional domain-wall pinning model based on the difference in a domain wall energy. Possibility that the coercivity is controlled by nucleation of reversed domains in magnetically isolated R2Co17 cells is discussed. © 2001 American Institute of Physics.

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Applied Physics Letters  (Volume:78 ,  Issue: 11 )