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A sign of field-induced first order magnetic state transition and giant reversible magnetocaloric effect in cobalt hydroxide nanosheets

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4 Author(s)
Shamba, P. ; Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522, Australia ; Zeng, R. ; Wang, J.Q. ; Dou, S.X.

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We report the synthesis of β-Co(OH)2 nanosheets using microwave assisted hydrothermal and conventional chemical reaction methods. A magnetic transition at an onset temperature, T1∼96 K, and a sign of antiferromagnetic state transition at the Néel temperature, TN=9∼10 K, can be determined from M-T curves and M-H curves magnetic properties investigation. It is found that a sign of field-induced first order transition below 9 K, act as a role of reversing the magnetocaloric effect from negative to positive value. The large reversible magnetic-entropy change SM) of 17 J/kg K around 11 K for a field change of 5 T indicates that this material is useful for refrigeration applications at low temperatures.

Published in:

Journal of Applied Physics  (Volume:107 ,  Issue: 9 )

Date of Publication:

May 2010

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