Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Magnonics 1

MA 13.10: Vortrag

Dienstag, 6. September 2022, 11:45–12:00, H43

New magnetostatic modes in biaxial magnets — •Yue Sun^1,2, Changmin Lee², Linda Ye³, Shingo Toyoda^1,2, Veronika Sunko^1,2, Joseph Checkelsky⁴, and Joseph Orenstein^1,2 — ¹University of California, Berkeley, Berkeley, California, USA — ²Lawrence Berkeley National Laboratory, Berkeley, California, USA — ³Stanford University, Stanford, California, USA — ⁴Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

Easy-plane antiferromagnets have been demonstrated to have long-distance magnon propagation and flexible control of ultrafast magnetic dynamics. However, exact XY systems are rare, and it is common to have a small in-plane crystalline easy-axis, which leads to the great interest in biaxial magnets. Spin superfluidity has been predicted in biaxial antiferromagnet in an applied magnetic field. Here, we discover new magnetostatic modes in both biaxial ferromagnet and antiferromagnet, where the interesting biaxial anisotropy opens new ranges for magnon frequency. We observe the new magnetostatic modes in biaxial ferromagnet Fe₃Sn₂, and the prediction of the magnetostatic modes in biaxial antiferromagnet matches with the experimental observations in CrSBr. Comparing to the spin wave induced by the exchange interaction, the magnetostatic modes dominate in the long wavelength limit and offer a unique possibility to observe magnon Bose-Einstein condensation in biaxial antiferromagnet.