Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window

Abstract
An effective scheme of isostructural alloying was applied to establish a Curie-temperature window in isostructural MnNiGe-CoNiGe system. With the simultaneous accomplishment of decreasing structural-transition temperature and converting antiferromagnetic martensite to ferromagnetic state, a 200 K Curie-temperature window was established between Curie temperatures of austenite and martensite phases. In the window, a first-order magnetostructural transition between paramagnetic austenite and ferromagnetic martensite occurs with a sharp jump in magnetization, showing a magnetic entropy change as large as −40 J kg−1 K−1 in a 50 kOe field change. This giant magnetocaloric effect enables Mn1− x Co x NiGe to become a potential magnetic refrigerant.

Citation
Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window 2013, 102 (12):122405 Applied Physics Letters

Publisher
AIP Publishing

Journal
Applied Physics Letters

DOI
10.1063/1.4798318

arXiv
1303.7282

Additional Links
http://scitation.aip.org/content/aip/journal/apl/102/12/10.1063/1.4798318http://arxiv.org/abs/1303.7282

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