Damping by slow relaxing rare earth impurities in Ni80Fe20

G. Woltersdorf; M. Kiessling; G. Meyer; J. -U. Thiele; C. H. Back

doi:10.1103/PhysRevLett.102.257602

Damping by slow relaxing rare earth impurities in Ni80Fe20

Materials Science 2015-05-13 v3

Authors: G. Woltersdorf , M. Kiessling , G. Meyer , J. -U. Thiele , C. H. Back

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Abstract

Doping NiFe by heavy rare earth atoms alters the magnetic relaxation properties of this material drastically. We show that this effect can be well explained by the slow relaxing impurity mechanism. This process is a consequence of the anisotropy of the on site exchange interaction between the 4f magnetic moments and the conduction band. As expected from this model the magnitude of the damping effect scales with the anisotropy of the exchange interaction and increases by an order of magnitude at low temperatures. In addition our measurements allow us to determine the relaxation time of the 4f electrons as a function of temperature.

Keywords

ni80fe20 rare earth impurities magnetic damping slow relaxing mechanism exchange interaction anisotropy magnetic relaxation 4f electrons

Cite

@article{arxiv.0802.3206,
  title  = {Damping by slow relaxing rare earth impurities in Ni80Fe20},
  author = {G. Woltersdorf and M. Kiessling and G. Meyer and J. -U. Thiele and C. H. Back},
  journal= {arXiv preprint arXiv:0802.3206},
  year   = {2015}
}

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