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A model that gives rise to effective dry friction in micromagnetics

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2 Author(s)
Baltensperger, W. ; Theoretical Physics, ETH Hönggerberg, 8093 Zürich, Switzerland ; Helman, J.S.

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Since dissipation requires motion, the velocity‐independent friction of macroscopic systems must result from quick motions of some of its components. A model of coupled spins, some of which have irregular anisotropy directions, presents velocity independent loss. During a collective motion of the spin ensemble, an irregular spin can fall into its potential minimum, from which it is subsequently dragged out again. The effect is pronounced for a range of the ratio between the anisotropy and interatomic exchange coupling constants which is typical for rare‐earth ions.

Published in:

Journal of Applied Physics  (Volume:73 ,  Issue: 10 )