Abstract

Chiral magnets hosting non-collinear spin textures such as the magnetic skyrmion lattice (SkL) and chiral solitons (CSL) [1,2] provide novel functionality in magnonics because of the formation of bandgaps in the magnon band structures and asymmetric magnon dispersion relations [3]. Collective spin excitations in bulk Cu2OSeO3 show a complex series of resonances due to multiple domains of different phases and the confinement effects [4]. Hence, it is challenging to get a one-to-one correspondence between a specific noncollinear phase and detected magnons. In this talk, I will show the stabilization of multiple SkL and CSL phases by continues-waved laser and the their magnon excitations locally detected by scanning micro-focus Brillouin light scattering (BLS) in bulk Cu2OSeO3. Our observations of locally excited high-wavevector thermal magnons suggest that the special selection rules and high sensitivity of BLS is helpful to bring out the resonances of both uniform and non-uniform skyrmion resonances and deepen the understanding of the noncollinear spin texture dynamics in a chiral magnet. It paves the way for further design of magnonic devices based on chiral magnets.

[1] S. Mühlbauer et al., Science 323, 915 (2009).
[2] Y. Okamura et al., Phys. Rev. B 96, 174417 (2017).
[3] M. Garst et al., J. Phys. D. Appl. Phys. 50, 293002 (2017).
[4] P. Che et al., Phys. Rev. Research 3, 033104 (2021).