Optically excited spin dynamics of thermally metastable skyrmions in Fe${}_{0.75}$Co${}_{0.25}$Si

Abstract

We investigate the microwave spin excitations of the cubic chiral magnet Fe${}_{0.75}$Co${}_{0.25}$Si as driven by the thermal modulation of magnetic interactions via laser heating and probed by time-resolved measurements of the magneto-optical Kerr effect. Focusing on the topologically nontrivial skyrmion lattice state, the dynamic properties in thermodynamic equilibrium are compared with those of a metastable state prepared by means of rapid field cooling. In both cases, we find precessional and exponential contributions to the dynamic response, characteristic of a breathing mode and energy dissipation, respectively. When taking into account the universal scaling as a function of temperature, the precession frequencies in the equilibrium and metastable skyrmion state are in excellent quantitative agreement. This finding highlights that skyrmion states far from thermal equilibrium promise great flexibility, for instance with respect to temperature and field scales, both for possible microwave applications and the study of fundamental properties.

arXiv comment16 pages, 4 figures

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Cited by in corpus (6)

• All optical control of bubble and skyrmion breathing
• Laser-induced real-space topology control of spin wave resonances
• Optical creation and annihilation of skyrmion patches in a bulk chiral magnet
• Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice
• Pathways to Bubble and Skyrmion Lattice Formation in Fe/Gd Multilayers
• Controlling bubble and skyrmion lattice order and dynamics via stripe domain engineering in ferrimagnetic Fe/Gd multilayers