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Magnetocaloric effect and nature of magnetic transition in low dimensional DyCu2
M. Venkat Narayana, G. Kotnana,
Published in Elsevier Ltd
2016
Volume: 683
   
Pages: 56 - 61
Abstract
In this manuscript, we propose a method to prepare small flakes of DyCu2. On top of that we also report on the magnetocaloric effect and nature of magnetic transition of a strongly anisotropic DyCu2in its low dimension. Magnetization measurements were carried out in the temperature range of 5–100 K and up to the maximum magnetic field strength of 50 kOe. Magnetic entropy change (ΔSM) is estimated using the well-known Maxwell's equations and is found to be −4.31 J/kg-K. Indeed, the ΔSMpeak broadened marginally compared with its bulk DyCu2and such a broadening can be attributed to significant increase in the total grain boundary volume. As these small flakes consists larger ΔSMvalues at temperatures higher than the Nèel temperature (TN), one can use them as a magnetic refrigerant material in a broad temperature range. We also plotted the M2vs. H/M (which are called as the Arrott plots) in order to find the nature of magnetic transition. Arrott plots infer that indeed there exists nonlinearity in M2vs. H/M behavior and such nonlinear behavior is ascribed to the random anisotropy or a random field that is present in the system. © 2016 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Alloys and Compounds
PublisherData powered by TypesetElsevier Ltd
ISSN09258388