Giant reversible magnetocaloric effect in cobalt hydroxide nanoparticles

Liu, X. H.; Liu, W.; Hu, W. J.; Guo, S.; Lv, X. K.; Cui, W. B.; Zhao, X. G.; Zhang, Z. D.
November 2008
Applied Physics Letters;11/17/2008, Vol. 93 Issue 20, p202502
Academic Journal
The magnetocaloric effect associated with magnetic phase transitions in β-Co(OH)2 nanoparticles has been investigated. A sign change in the magnetocaloric effect is induced by a magnetic field, which is related to a field-induced transition from the antiferromagnetic to the ferromagnetic state below the Néel temperature. The large reversible magnetic-entropy change -ΔSm (20.9 J/kg K at 15 K for a field change of 7 T) indicates that β-Co(OH)2 is a potential candidate for application in magnetic refrigeration in the low-temperature range.


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