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MA: Fachverband Magnetismus

MA 2: Altermagnets I

MA 2.4: Talk

Monday, March 9, 2026, 10:15–10:30, HSZ/0004

Altermagnetism in magnetic nanoisland arrays — •Rhea Hoyer¹, Lukas Körber², Tobias Wagner³, and Alexander Mook¹ — ¹Institut für Festkörpertheorie, Universität Münster, Münster, Germany — ²Institute of Molecules and Materials, Radboud University, Nijmegen, The Netherlands — ³Department of Physics, Johannes Gutenberg University Mainz, Mainz, Germany

We present a macrospin model for magnetic island arrays engineered with altermagnetic symmetries. The islands interact purely via dipole-dipole coupling, which makes the strict spin-orbit-free limit of altermagnetism inaccessible. Although the magnon dispersion is split by spin-orbit coupling, the magnon bands remain spin-polarized, exhibiting a characteristic d-wave-like pattern of the spin expectation value across the Brillouin zone. This residual altermagnetic character gives rise to direction-dependent spin dynamics and suggests the possibility of anisotropic spin-transport phenomena in mesoscopic artificial magnets.

Keywords: Altermagnets; Magnons; Spin transport; Dipole-dipole interaction