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Type: Artigo
Title: Magnetic And Magnetocaloric Properties Of Dymn2si2 Compound With Multiple Magnetic Phase Transition
Author: dos Reis
D. C.; Franca
E. L. T.; de Paula
V. G.; dos Santos
A. O.; Coelho
A. A.; Cardoso
L. P.; da Silva
L. M.
Abstract: Structural, magnetic and magnetocaloric properties of the ternary intermetallic compound DyMn2Si2 are studied by X-ray diffraction and magnetization measurements. It is found that DyMn2Si2 crystalizes with tetragonal ThCr2S2-type structure and exhibits four successive magnetic transitions at low temperature, around 20 K, 31 K, 38 K and 82 K, named respectively as T-1, T-2, T-3 and T-4 transitions. Large values of magnetic field (> 35 kOe) favor antiferromagnetic clusters and give rise to exchange bias effect. The different responses of T-2 and T3 to field change, induces two non-identical isothermal entropy change (-Delta S-M) peaks. The maximum values of -Delta S-M occur in temperatures around T-3 and reaches 8.2 J/kgK, for a magnetic field change of 50 kOe. Also, the presence of transitions T-2 and T-3 close to each other induces a table-like magnetocaloric effect (MCE) in a wide temperature range. Thus, the peculiar magnetic properties observed for DyMn2Si2 compound are interesting for low temperature magnetic refrigeration.
Subject: Magnetocaloric Effect
Multiple Phase Transition
Exchange Bias Effect
Editor: Elsevier Science BV
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2016.10.019
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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