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.

16 pages, 4 figures

References in corpus (8)

• Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
• Giant generic topological Hall resistivity of MnSi under pressure
• Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As
• Magnetoelectric Resonances and Predicted Microwave Diode Effect of Skyrmion Crystal in Multiferroic Chiral-Lattice Magnet
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Dynamic Excitations of Chiral Magnetic Textures
• Extended skyrmion lattice scattering and long-time memory in the chiral magnet Fe${}_{1-x}$Co${}_x$Si
• Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet

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• 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