Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Autor: Charles R. S. Haines, Miguel Corró, Xiebin Wang, Ekhard K. H. Salje, J. Torrens-Serra, Sergey Kustov, Iuliia Liubimova
Přispěvatelé: Salje, Ekhard KH [0000-0002-8781-6154], Apollo - University of Cambridge Repository
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019)
Scientific Reports
ISSN: 2045-2322
DOI: 10.1038/s41598-019-41566-7
Popis: 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.
Databáze: OpenAIRE
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