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Visualizing rotation and reversal of the Néel vector through antiferromagnetic trichroism

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  • Kenta Kimura

    (University of Tokyo)

  • Yutaro Otake

    (University of Tokyo)

  • Tsuyoshi Kimura

    (University of Tokyo)

Abstract

Conventional magnetic memories rely on bistable magnetic states, such as the up and down magnetization states in ferromagnets. Increasing the number of stable magnetic states in each cell, preferably composed of antiferromagnets without stray fields, promises to achieve higher-capacity memories. Thus far, such multi-stable antiferromagnetic states have been extensively studied in conducting systems. Here, we report on a striking optical response in the magnetoelectric collinear antiferromagnet Bi2CuO4, which is an insulating version of the representative spintronic material, CuMnAs, with four stable Néel vector orientations. We find that, due to a magnetoelectric effect in a visible range, which is enhanced by a peculiar local environment of Cu ions, absorption coefficient takes three discrete values depending on an angle between the propagation vector of light and the Néel vector—a phenomenon that we term antiferromagnetic trichroism. Furthermore, using this antiferromagnetic trichroism, we successfully visualize field-driven reversal and rotation of the Néel vector.

Suggested Citation

  • Kenta Kimura & Yutaro Otake & Tsuyoshi Kimura, 2022. "Visualizing rotation and reversal of the Néel vector through antiferromagnetic trichroism," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28215-w
    DOI: 10.1038/s41467-022-28215-w
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    References listed on IDEAS

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    1. J. Godinho & H. Reichlová & D. Kriegner & V. Novák & K. Olejník & Z. Kašpar & Z. Šobáň & P. Wadley & R. P. Campion & R. M. Otxoa & P. E. Roy & J. Železný & T. Jungwirth & J. Wunderlich, 2018. "Electrically induced and detected Néel vector reversal in a collinear antiferromagnet," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    2. D. Kriegner & K. Výborný & K. Olejník & H. Reichlová & V. Novák & X. Marti & J. Gazquez & V. Saidl & P. Němec & V. V. Volobuev & G. Springholz & V. Holý & T. Jungwirth, 2016. "Multiple-stable anisotropic magnetoresistance memory in antiferromagnetic MnTe," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
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