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Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

Hicken, T. J. and Wilson, M. N. and Franke, K. J. A. and Huddart, B. M. and Hawkhead, Z. and Gomilšek, M. and Clark, S. J. and Pratt, F. L. and Štefančič, A. and Hall, A. E. and Ciomaga Hatnean, M. and Balakrishnan, G. and Lancaster, T. (2021) 'Megahertz dynamics in skyrmion systems probed with muon-spin relaxation.', Physical Review B, 103 (2). 024428.


We present longitudinal-field muon-spin relaxation (LF μ SR ) measurements on two systems that stabilize a skyrmion lattice (SkL): Cu 2 OSeO 3 , and Co x Zn y Mn 20 − x − y for ( x , y ) = ( 10 , 10 ) , (8, 9), and (8, 8). We find that the SkL phase of Cu 2 OSeO 3 exhibits emergent dynamic behavior at megahertz frequencies, likely due to collective excitations, allowing the SkL to be identified from the μ SR response. From measurements following different cooling protocols and calculations of the muon stopping site, we suggest that the metastable SkL is not the majority phase throughout the bulk of this material at the fields and temperatures where it is often observed. The dynamics of bulk Co 8 Zn 9 Mn 3 are well described by ≃ 2 GHz excitations that reduce in frequency near the critical temperature, while in Co 8 Zn 8 Mn 4 we observe similar behavior over a wide range of temperatures, implying that dynamics of this kind persist beyond the SkL phase.

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Publisher statement:Reprinted with permission from the American Physical Society: Hicken, T. J., Wilson, M. N., Franke, K. J. A., Huddart, B. M., Hawkhead, Z., Gomilšek, M., Clark, S. J., Pratt, F. L., Štefančič, A., Hall, A. E., Ciomaga Hatnean, M., Balakrishnan, G. & Lancaster, T. (2021). Megahertz dynamics in skyrmion systems probed with muon-spin relaxation. Physical Review B 103(2). © 2021 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:14 December 2020
Date deposited:23 September 2021
Date of first online publication:19 January 2021
Date first made open access:23 September 2021

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