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arXiv · 2604.00325

Metallic d-wave altermagnetism in WFeB: a platform for electrically switchable perpendicular spin-splitter response

Eranga H. Gamage·Zhen Zhang·Subhadip Pradhan·Ajay Kumar·David R. Ramgern·V. Ovidiu Garlea·Yaroslav Mudryk·Saeed Kamali·Douglas Warnberg·Kirill D. Belashchenko·Vladimir Antropov·Kirill Kovnir
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Abstract

We report the synthesis and magnetic characterization of WFeB and identify it as a metallic d-wave altermagnet representative of a broader TiNiSi-type family. Neutron diffraction, M\"ossbauer spectroscopy, and magnetometry establish a collinear altermagnetic ordering confirmed by first-principles calculations. The electronic structure shows a nonrelativistic spin splitting of approximately 100 meV, but it also supports a strong spin-splitter transport response. This demonstrates that efficient spin-current generation can occur even with such modest band splitting. Symmetry analysis shows that selected film orientations permit deterministic switching of the N\'eel vector by current-induced staggered torques, enabling electrical control of a perpendicular spin-splitter response. These results establish WFeB and related TiNiSi-type antiferromagnets as a platform for electrically switchable charge-to-spin conversion driven by altermagnetic symmetry.

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Eranga H. Gamage, Zhen Zhang, Subhadip Pradhan, Ajay Kumar, David R. Ramgern, V. Ovidiu Garlea, Yaroslav Mudryk, Saeed Kamali, Douglas Warnberg, Kirill D. Belashchenko, Vladimir Antropov, Kirill Kovnir. 2026-03-31. Metallic d-wave altermagnetism in WFeB: a platform for electrically switchable perpendicular spin-splitter response. https://arxiv.org/abs/2604.00325

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