Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Magnonics I
MA 3.9: Talk
Monday, March 17, 2025, 11:45–12:00, H18
Fluctuations of the inverted magnetic state and how to sense them — •Anna-Luisa Römling1, Artim Bassant2, and Rembert Duine2 — 1Condensed Matter Physics Center (IFIMAC) and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain — 2Institute for Theoretical Physics, Utrecht University, Utrecht, The Netherlands
Magnons are the low-energy exciations of magnetically ordered materials. While the magnetic moment of a ferromagnet below Curie tempertature aligns with an applied magnetic field, recent theoretical work has demonstrated that the magnetic order can be inverted by pumping spin orbit torque into the magnet. This results in an energetically unstable but dynamically stabilized state where the magnetic moment is antiparallel to an applied magnetic field. The excitations on such a state have negative energy and are called antimagnons, the antiparticle of the magnon. Here, we theoretically study the quantum and classical fluctuations of the inverted magnetic state and their sigatures in experimental set-ups. Our results advance the understanding of fundamental properties of antimagnons as well as experimental data related to the inverted magnetic state. They pave the way for exciting applications in spintronics and magnonics.
Keywords: Antimagnonics; Quantum fluctuations; Sensing