Nonlocal magnon spin transport in NiFe$_2$O$_4$ thin films

J. Shan; P. Bougiatioti; L. Liang; G. Reiss; T. Kuschel; B. J. van Wees

doi:10.1063/1.4979408

Nonlocal magnon spin transport in NiFe$_2$O$_4$ thin films

Materials Science 2017-04-14 v2

Authors: J. Shan , P. Bougiatioti , L. Liang , G. Reiss , T. Kuschel , B. J. van Wees

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Abstract

We report magnon spin transport in nickel ferrite (NiFe $_2$ O $_4$ , NFO)/ platinum (Pt) bilayer systems at room temperature. A nonlocal geometry is employed, where the magnons are excited by the spin Hall effect or by the Joule heating induced spin Seebeck effect at the Pt injector, and detected at a certain distance away by the inverse spin Hall effect at the Pt detector. The dependence of the nonlocal magnon spin signals as a function of the magnetic field is closely related to the NFO magnetization behavior. In contrast, we observe that the magnetoresistance measured locally at the Pt injector does not show a clear relation with the average NFO magnetization. We estimate the magnon spin relaxation length to be 3.1 $\pm$ 0.2 $\mu$ m in the investigated NFO samples.

Keywords

magnon spin transport nickel ferrite nonlocal geometry spin Hall effect spin Seebeck effect magnetoresistance spin relaxation length

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@article{arxiv.1701.02041,
  title  = {Nonlocal magnon spin transport in NiFe$_2$O$_4$ thin films},
  author = {J. Shan and P. Bougiatioti and L. Liang and G. Reiss and T. Kuschel and B. J. van Wees},
  journal= {arXiv preprint arXiv:1701.02041},
  year   = {2017}
}

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6 pages, 4 figures

Nonlocal magnon spin transport in NiFe$_2$O$_4$ thin films

Abstract

Keywords

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