Megahertz dynamics in skyrmion systems probed with muon-spin relaxation [dataset]

Pratt, Francis (ISIS Pulsed Neutron and Muon Facility, UK); Ciomaga Hatnean, Monica (University of Warwick, UK); Wilson, Murray (Durham University, UK); Hicken, Thomas (Durham University, UK); Lancaster, Tom (Durham University, UK); Balakrishnan, Geetha (University of Warwick, UK); Štefančič, Ales (University of Warwick, UK); Huddart, Benjamin (Durham University, UK); Hawkhead, Zachary (Durham University, UK); Gomilšek, Matjaž (Durham University, UK); Hall, Amelia (University of Warwick, UK); Clark, Stewart (Durham University, UK); Franke, Kévin (Durham University, UK)

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Megahertz dynamics in skyrmion systems probed with muon-spin relaxation [dataset] Open Access

We present longitudinal-field muon-spin relaxation (LF μSR) measurements on two systems that stabilize a skyrmion lattice (SkL): Cu2OSeO3, and CoxZnyMn20−x−y for (x,y)=(10,10), (8, 9), and (8,8). We find that the SkL phase of Cu2OSeO3 exhibits emergent dynamic behavior at megahertz frequencies, likely due to collective excitations, allowing the SkL to be identified from the μSR 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 Co8Zn9Mn3 are well described by ≃2 GHz excitations that reduce in frequency near the critical temperature, while in Co8Zn8Mn4 we observe similar behavior over a wide range of temperatures, implying that dynamics of this kind persist beyond the SkL phase.

Descriptions

Resource type: Dataset
Contributors: Creator: Hicken, Thomas ¹
Creator: Wilson, Murray ¹
Creator: Franke, Kévin ¹
Creator: Huddart, Benjamin ¹
Creator: Hawkhead, Zachary ¹
Creator: Gomilšek, Matjaž ¹
Creator: Clark, Stewart ¹
Creator: Pratt, Francis ²
Creator: Štefančič, Ales ³
Creator: Hall, Amelia ³
Creator: Ciomaga Hatnean, Monica ³
Creator: Balakrishnan, Geetha ³
Creator: Lancaster, Tom ¹
Contact person: Lancaster, Tom ¹

¹ Durham University, UK
² ISIS Pulsed Neutron and Muon Facility, UK
³ University of Warwick, UK
Funder: Engineering and Physical Sciences Research Council
Javna Agencija za Raziskovalno Dejavnost RS
Natural Sciences and Engineering Research Council of Canada
Research methods
Other description
Keyword: Muon spin relaxation & rotation
Skyrmions
Magnetic order
Subject
Location
Language: English
Cited in: doi:10.1103/PhysRevB.103.024428
Identifier: ark:/32150/r2w9505053g
doi:10.15128/r2w9505053g
Rights: Creative Commons Attribution 4.0 International (CC BY)
Publisher: Durham University
Date Created

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Depositor: T.J. Hicken
Date Uploaded: 15 December 2020, 10:12:58
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