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    Signatures of Altermagnetism in BiFeO3

    Sajid Husain1,2,*,†, Maya Ramesh3,*, Qian Song1,4, Sergei Prokhorenko5, Shashank Kumar Ojha4,6, Surya Narayan Panda4,6, Xinyan Li4,6, Yousra Nahas5, Yogesh Kumar1 et al.

    Pushpendra Gupta1, Tenzin Chang2, Alan Ji-in Jung2, Rogério de Sousa7,8, James G. Analytis2, Lane W. Martin4,6,9,10, Zhi Yao11, Yimo Han4,6, Sang-Wook Cheong12, Laurent Bellaiche5,13, Manuel Bibes14, Darrell G. Schlom3,15,16, and Ramamoorthy Ramesh1,2,4,6,9,17,‡

    • *These authors contributed equally to this work.
    • †Contact author: shusain@berkeley.edu
    • ‡Contact author: rramesh@berkeley.edu

    Phys. Rev. Lett. 137, 036702 – Published 13 July, 2026

    DOI: https://doi.org/10.1103/1wyj-nrgk

    Abstract

    Magnons provide a route to ultrafast transport and nondestructive readout of spin-based information transfer. Here, we report magnon transport and its emergent anisotropic nature in BiFeO3 layers confined between ultrathin layers of the antiferromagnet LaFeO3. Because of the confined state, BiFeO3 serves as an efficient magnon transmission channel as well as a magnetoelectric knob by which to control the stack by means of an electric field. We discuss the mechanism of the anisotropic spin transport based on the interaction between the antiferromagnetic order and the electric field. This allows us to manipulate and amplify the spin transport in such a confined geometry. Furthermore, lower crystal symmetry and suppression of the spin cycloid in ultrathin BiFeO3 stabilizes an antiferromagnetic state exhibiting a nontrivial sign inversion of the spin current, which is a characteristic of an altermagnet. This Letter provides an understanding of the anisotropic spin transport in complex antiferromagnetic heterostructures where ferroelectricity and altermagnetism coexist, paving the way for a new route to realize electric-field control of a novel state of magnetism.

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