Temperature chaos, memory effect, and domain fluctuations in the spiral antiferromagnet Dy

Kustov, Sergey, Liubimova, Iuliia, Corró, Miguel, Torrens-Serra, Joan, Wang, Xiebin, Haines, Sebastian and Salje, E. K. H. (2019) Temperature chaos, memory effect, and domain fluctuations in the spiral antiferromagnet Dy. Scientific Reports, 9. ISSN 2045-2322

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Abstract

The spiral antiferromagnetic phase of polycrystalline dysprosium between 140 K and the Néel temperature at 178 K and its domain wall (DW) dynamics were investigated using high-resolution ultrasonic spectroscopy. Two kinetic processes of quasi-static DW motion occur under non-isothermal and isothermal conditions. A “fast” process is proportional to the rate of the temperature change and results in a new category of anelastic phenomena: magnetic transient ultrasonic internal friction (IF). This IF, related to fast moving magnetic DWs, decays rapidly after interruptions of cooling/heating cycles. A second, “slow” kinetic process is seen as logarithmic IF relaxation under isothermal conditions. This second process is glass-like and results in memory and temperature chaos effects. Low-frequency thermal fluctuations of DWs, previously detected by X-ray photon correlation spectroscopy, are related to critical fluctuations with Brownian motion-like dynamics of DWs.

Item Type: Article
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Depositing User: LivePure Connector
Date Deposited: 20 Jan 2022 08:30
Last Modified: 06 May 2022 03:51
URI: https://ueaeprints.uea.ac.uk/id/eprint/83075
DOI: 10.1038/s41598-019-41566-7

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