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MA: Fachverband Magnetismus

MA 9: Altermagnets I

MA 9.5: Vortrag

Montag, 17. März 2025, 16:00–16:15, H20

Giant spatial anisotropy of magnon lifetime in altermagnets — •António Costa^1,2, João Henriques^1,3, and Joaquín Fernández-Rossier¹ — ¹International Iberian Nanotechnology Laboratory, Braga, Portugal — ²Physics Center of Minho and Porto Universities (CF-UM-UP), Braga, Portugal — ³Universidade de Santiago de Compostela, Santiago de Compostela, Spain

Altermagnets are a new class of magnetic materials with zero net magnetization (like antiferromagnets) but spin-split electronic bands (like ferromagnets) over a fraction of reciprocal space. As in antiferromagnets, magnons in altermagnets come in two flavours, that either add one or remove one unit of spin to the S=0 ground state. However, in altermagnets these two magnon modes are non-degenerate along some directions in reciprocal space. Here we show that the lifetime of altermagnetic magnons has a very strong dependence on both flavour and direction. Strikingly, coupling to Stoner modes leads to a complete suppression of magnon propagation along selected spatial directions. This giant anisotropy will impact electronic, spin, and energy transport properties and may be exploited in spintronic applications.

Keywords: Altermagnets; Magnons; Stoner damping