Recently, the Co8Zn8Mn4 alloy was found to host the skyrmion crystal phase at room temperature [1,2]. Understanding the GHz spin dynamics and magnonic eigenmodes of this phase is key for developing room temperature applications in spintronics and magnonics. Here, we report the broadband microwave absorption spectroscopy measurement of bulk Co8Zn8Mn4 crystal, mounted onto a coplanar waveguide (CPW). We have determined the resonance frequencies of the eigen-excitations of the various magnetic phases in Co8Zn8Mn4 - at room temperature - including the helical, skyrmion crystal, conical and fully polarized magnetic order (Fig. 1 and Fig. 2). In particular, we found that the clockwise, counter-clockwise and breathing modes of the skyrmion crystal magnetic configuration resides between ~0.8 and 2.5(2) GHz. The frequencies of the modes depend on the orientation of the applied field with respect to the CPW and the long axis of the crystal. We account for the frequency variations by means of magnetic anisotropies. Furthermore, we augment our results with single crystal x-ray diffraction measurements and temperature-dependent magnetic susceptometry. We thank S. Watanabe, P. R. Baral and I. Zukovic for experimental support. The research was financially supported by the SNSF (grant no. 171003 - sinergia project Nanoskyrmionics) and the EPSRC (grant no. EP/M020517/1).References: 1. Y. Tokunaga, X. Z. Yu, J. S. White, et al. Nature Communication, Vol. 6 p. 7638 (2015) 2. K. Karube, J. S. White, N. Reynolds, et al. Nature Materials, Vol. 15, p. 4752 (2016)

Magnetization Dynamics of Helical and Skyrmion Phases in Bulk Co8Zn8Mn4 at Room Temperature

M3: Magnetization Dynamics and Damping IV: Spin current, spin-torque, Spin Transport, Vortices, Skyrmions and Domain Walls

technical paper

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Magnetization Dynamics of Helical and Skyrmion Phases in Bulk Co8Zn8Mn4 at Room Temperature

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