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Evolution of the spin hall magnetoresistance in Cr2O3/Pt bilayers close to the Néel temperature

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2018

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Schlitz, Richard
Kosub, Tobias
Thomas, Andy
Fabretti, Savio
Nielsch, Kornelius

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https://doi.org/10.1063/1.5019934
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http://arxiv.org/abs/1712.08563

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Applied Physics Letters. American Institute of Physics (AIP). 2018, 112(13), 132401. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.5019934

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We study the evolution of magnetoresistance with temperature in thin film bilayers consisting of platinum and the antiferromagnet Cr2O3 with its easy axis out of the plane. We vary the temperature from 20°C to 60°C, close to the Néel temperature of Cr2O3 of approximately 37°C. The magnetoresistive response is recorded during rotations of the external magnetic field in three mutually orthogonal planes. A large magnetoresistance having a symmetry consistent with a positive spin Hall magnetoresistance is observed in the paramagnetic phase of the Cr2O3, which however vanishes when cooling to below the N'eel temperature. Comparing to analogous experiments in a Gd3Ga5O12/Pt heterostructure, we conclude that a paramagnetic field induced magnetization in the insulator is not sufficient to explain the observed magnetoresistance. We speculate that the type of magnetic moments at the interface qualitatively impacts the spin angular momentum transfer, with the 3d moments of Cr sinking angular momentum much more efficiently as compared to the more localized 4f moments of Gd.

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530 Physik

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ISO 690SCHLITZ, Richard, Tobias KOSUB, Andy THOMAS, Savio FABRETTI, Kornelius NIELSCH, Denis MAKAROV, Sebastian T. B. GOENNENWEIN, 2018. Evolution of the spin hall magnetoresistance in Cr2O3/Pt bilayers close to the Néel temperature. In: Applied Physics Letters. American Institute of Physics (AIP). 2018, 112(13), 132401. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.5019934
BibTex
@article{Schlitz2018Evolu-51778,
  year={2018},
  doi={10.1063/1.5019934},
  title={Evolution of the spin hall magnetoresistance in Cr<sub>2</sub>O<sub>3</sub>/Pt bilayers close to the Néel temperature},
  number={13},
  volume={112},
  issn={0003-6951},
  journal={Applied Physics Letters},
  author={Schlitz, Richard and Kosub, Tobias and Thomas, Andy and Fabretti, Savio and Nielsch, Kornelius and Makarov, Denis and Goennenwein, Sebastian T. B.},
  note={Article Number: 132401}
}
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