Large Spin Hall Magnetoresistance in Antiferromagnetic α−Fe2O3/Pt Heterostructures

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2020
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Fischer, Johanna
Althammer, Matthias
Vlietstra, Nynke
Huebl, Hans
Gross, Rudolf
Geprägs, Stephan
Opel, Matthias
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Physical Review Applied. American Physical Society (APS). 2020, 13(1), 014019. eISSN 2331-7019. Available under: doi: 10.1103/PhysRevApplied.13.014019
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We investigate the spin Hall magnetoresistance (SMR) at room temperature in thin film heterostructures of antiferromagnetic, insulating, (0001)-oriented alpha-Fe2O3 (hematite) and Pt. We measure their longitudinal and transverse resistivities while rotating an applied magnetic field of up to 17T in three orthogonal planes. For out-of-plane magnetotransport measurements, we find indications for a multidomain antiferromagnetic configuration whenever the field is aligned along the film normal. For in-plane field rotations, we clearly observe a sinusoidal resistivity oscillation characteristic for the SMR due to a coherent rotation of the Neel vector. The maximum SMR amplitude of 0.25% is, surprisingly, twice as high as for prototypical ferrimagnetic Y3Fe5O12/Pt heterostructures. The SMR effect saturates at much smaller magnetic fields than in comparable antiferromagnets, making the alpha-Fe2O3/Pt system particularly interesting for room-temperature antiferromagnetic spintronic applications.

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ISO 690FISCHER, Johanna, Matthias ALTHAMMER, Nynke VLIETSTRA, Hans HUEBL, Sebastian T. B. GOENNENWEIN, Rudolf GROSS, Stephan GEPRÄGS, Matthias OPEL, 2020. Large Spin Hall Magnetoresistance in Antiferromagnetic α−Fe2O3/Pt Heterostructures. In: Physical Review Applied. American Physical Society (APS). 2020, 13(1), 014019. eISSN 2331-7019. Available under: doi: 10.1103/PhysRevApplied.13.014019
BibTex
@article{Fischer2020Large-51840,
  year={2020},
  doi={10.1103/PhysRevApplied.13.014019},
  title={Large Spin Hall Magnetoresistance in Antiferromagnetic α−Fe<sub>2</sub>O<sub>3</sub>/Pt Heterostructures},
  number={1},
  volume={13},
  journal={Physical Review Applied},
  author={Fischer, Johanna and Althammer, Matthias and Vlietstra, Nynke and Huebl, Hans and Goennenwein, Sebastian T. B. and Gross, Rudolf and Geprägs, Stephan and Opel, Matthias},
  note={Article Number: 014019}
}
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