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Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures

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2018

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Fischer, Johanna
Gomonay, Olena
Schlitz, Richard
Ganzhorn, Kathrin
Vlietstra, Nynke
Althammer, Matthias
Huebl, Hans
Opel, Matthias
Geprägs, Stephan
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https://doi.org/10.1103/PhysRevB.97.014417
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http://arxiv.org/abs/1709.04158v2

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Physical Review B. American Physical Society (APS). 2018, 97(1), 014417. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.97.014417

Zusammenfassung

We investigate the spin Hall magnetoresistance in thin-film bilayer heterostructures of the heavy metal Pt and the antiferromagnetic insulator NiO. While rotating an external magnetic field in the easy plane of NiO, we record the longitudinal and the transverse resistivity of the Pt layer and observe an amplitude modulation consistent with the spin Hall magnetoresistance. In comparison to Pt on collinear ferrimagnets, the modulation is phase shifted by 90∘ and its amplitude strongly increases with the magnitude of the magnetic field. We explain the observed magnetic field dependence of the spin Hall magnetoresistance in a comprehensive model taking into account magnetic-field-induced modifications of the domain structure in antiferromagnets. With this generic model, we are further able to estimate the strength of the magnetoelastic coupling in antiferromagnets. Our detailed study shows that the spin Hall magnetoresistance is a versatile tool to investigate the magnetic spin structure as well as magnetoelastic effects, even in antiferromagnetic multidomain materials.

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ISO 690FISCHER, Johanna, Olena GOMONAY, Richard SCHLITZ, Kathrin GANZHORN, Nynke VLIETSTRA, Matthias ALTHAMMER, Hans HUEBL, Matthias OPEL, Sebastian T. B. GOENNENWEIN, Stephan GEPRÄGS, 2018. Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures. In: Physical Review B. American Physical Society (APS). 2018, 97(1), 014417. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.97.014417
BibTex
@article{Fischer2018magne-51892,
  year={2018},
  doi={10.1103/PhysRevB.97.014417},
  title={Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures},
  number={1},
  volume={97},
  issn={2469-9950},
  journal={Physical Review B},
  author={Fischer, Johanna and Gomonay, Olena and Schlitz, Richard and Ganzhorn, Kathrin and Vlietstra, Nynke and Althammer, Matthias and Huebl, Hans and Opel, Matthias and Goennenwein, Sebastian T. B. and Geprägs, Stephan},
  note={Article Number: 014417}
}
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    <dcterms:abstract xml:lang="eng">We investigate the spin Hall magnetoresistance in thin-film bilayer heterostructures of the heavy metal Pt and the antiferromagnetic insulator NiO. While rotating an external magnetic field in the easy plane of NiO, we record the longitudinal and the transverse resistivity of the Pt layer and observe an amplitude modulation consistent with the spin Hall magnetoresistance. In comparison to Pt on collinear ferrimagnets, the modulation is phase shifted by 90&lt;sup&gt;∘&lt;/sup&gt; and its amplitude strongly increases with the magnitude of the magnetic field. We explain the observed magnetic field dependence of the spin Hall magnetoresistance in a comprehensive model taking into account magnetic-field-induced modifications of the domain structure in antiferromagnets. With this generic model, we are further able to estimate the strength of the magnetoelastic coupling in antiferromagnets. Our detailed study shows that the spin Hall magnetoresistance is a versatile tool to investigate the magnetic spin structure as well as magnetoelastic effects, even in antiferromagnetic multidomain materials.</dcterms:abstract>
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