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Magnetic relaxation dynamics driven by the first-order character of magnetocaloric La(Fe,Mn,Si)13.

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Title: Magnetic relaxation dynamics driven by the first-order character of magnetocaloric La(Fe,Mn,Si)13.
Authors: Lovell, E
Bratko, M
Caplin, AD
Barcza, A
Katter, M
Ghivelder, L
Cohen, LF
Item Type: Journal Article
Abstract: Here, we study the temporal evolution of the magnetic field-driven paramagnetic to ferromagnetic transition in the La(Fe,Mn,Si)13 material family. Three compositions are chosen that show varying strengths of the first-order character of the transition, as determined by the relative magnitude of their magnetic hysteresis and temperature separation between the zero-field transition temperature Tc and the temperature Tcrit, where the transition becomes continuous. Systematic variations in the fixed field, isothermal rate of relaxation are observed as a function of temperature and as a function of the degree of first-order character. The relaxation rate is reduced in more weakly first-order compositions and is also reduced as the temperature is increased towards Tcrit At temperatures above Tcrit, the metastability of the transition vanishes along with its associated temporal dynamics.This article is part of the themed issue Taking the temperature of phase transitions in cool materials.
Issue Date: 11-Jul-2016
Date of Acceptance: 11-Jul-2016
URI: http://hdl.handle.net/10044/1/37419
DOI: https://dx.doi.org/10.1098/rsta.2015.0307
ISSN: 1364-503X
Publisher: The Royal Society
Journal / Book Title: Philosophical Transactions of the Royal Society A: Math Phys Eng Sci
Volume: 374
Issue: 2074
Copyright Statement: © 2016 The Author(s) http://royalsocietypublishing.org/licence Published by the Royal Society. All rights reserved.
Keywords: magnetic refrigeration
magnetic relaxation
magnetocaloric effect
metamagnetic transition
General Science & Technology
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences