Kavli Affiliate: Darrell Schlom
| First 5 Authors: Isaac A. Harris, Sajid Husain, Peter Meisenheimer, Maya Ramesh, Hyeon Woo Park
| Summary:
Magnons carriers of spin information can be controlled by electric fields in
the multiferroic BiFeO$_3$ (BFO), a milestone that brings magnons closer to
application in future devices. The origin of magnon-spin currents in BFO,
however, is not fully understood due to BFO’s complicated magnetic texture. In
this letter, we present a phenomenological model to elucidate the existence of
magnon spin currents in generalized multiferroics by examining the symmetries
inherent to their magnetic and polar structures. This model is grounded in
experimental data obtained from BFO and its derivatives, which informs the
symmetry operations and resultant magnon behavior. By doing so, we address the
issue of symmetry-allowed, switchable magnon spin transport in multiferroics,
thereby establishing a critical framework for comprehending magnon transport
within complex magnetic textures.
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