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Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface

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2025

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Leiviskä, Miina
Firouzmandi, Reza
Ahn, Kyo-Hoon
Kubaščik, Peter
Soban, Zbynek
Bommanaboyena, Satya Prakash
Kriegner, Dominik
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https://doi.org/10.1103/hksk-qxl5
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European Union (EU): 101081515
Deutsche Forschungsgemeinschaft (DFG): 445976410
Deutsche Forschungsgemeinschaft (DFG): 490730630
Deutsche Forschungsgemeinschaft (DFG): 425217212
Deutsche Forschungsgemeinschaft (DFG): 247310070
Deutsche Forschungsgemeinschaft (DFG): 390858490
European Union (EU): 101095925

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Physical Review Materials. American Physical Society (APS). 2025, 9(8), 084403. eISSN 2475-9953. Verfügbar unter: doi: 10.1103/hksk-qxl5

Zusammenfassung

The resistance of a heavy metal can be modulated by an adjacent magnetic material through the combined effects of the spin Hall effect, inverse spin Hall effect, and dissipation of the spin accumulation at the interface. This phenomenon is known as the spin Hall magnetoresistance. The dissipation of the spin accumulation can occur via various mechanisms, with spin-transfer torque being the most extensively studied. In this work, we report the observation of spin Hall magnetoresistance at the interface between platinum and an insulating altermagnetic candidate, Ba2⁢CoGe2⁢O7. Our findings reveal that this heterostructure exhibits a relatively large spin Hall magnetoresistance signal, which is anisotropic with respect to the crystal orientation of the current channel. We explore and rule out several potential explanations for this anisotropy and propose that our results may be understood in the context of the anisotropies of the spin current channels across the Pt/altermagnetic Ba2⁢CoGe2⁢O7 interface.

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ISO 690LEIVISKÄ, Miina, Reza FIROUZMANDI, Kyo-Hoon AHN, Peter KUBAŠČIK, Zbynek SOBAN, Satya Prakash BOMMANABOYENA, Christoph MÜLLER, Dominik KRIEGNER, Sebastian SAILLER, Denise REUSTLEN, Michaela LAMMEL, Sebastian T. B. GOENNENWEIN, Helena REICHLOVA, 2025. Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface. In: Physical Review Materials. American Physical Society (APS). 2025, 9(8), 084403. eISSN 2475-9953. Verfügbar unter: doi: 10.1103/hksk-qxl5
BibTex
@article{Leiviska2025-08-07magne-74941,
  title={Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface},
  year={2025},
  doi={10.1103/hksk-qxl5},
  number={8},
  volume={9},
  journal={Physical Review Materials},
  author={Leiviskä, Miina and Firouzmandi, Reza and Ahn, Kyo-Hoon and Kubaščik, Peter and Soban, Zbynek and Bommanaboyena, Satya Prakash and Müller, Christoph and Kriegner, Dominik and Sailler, Sebastian and Reustlen, Denise and Lammel, Michaela and Goennenwein, Sebastian T. B. and Reichlova, Helena},
  note={Article Number: 084403}
}
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