Size Influence on Magnetic Properties of Nickel Hollow Spheres

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Abstract:

Nickel hollow spheres (NHSs) with different diameter have been synthesized by the autocatalytic reduction method. The morphology, size distribution and magnetic properties of NHSs were characterized. The results indicate that when the nickel hollow spheres become smaller, mechanism of magnetization reversal varies from motion of domain wall to spin coherent rotation. After the heat treatment process, the grain size of samples becomes bigger and coercivity is enhanced because domain wall is pinned by local magnetic anisotropy induced spontaneously.

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Advanced Materials Research (Volumes 652-654)

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321-326

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January 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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