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Impact of structural disorder on the magnetic ordering and magnetocaloric response of amorphous Gd-based microwires.

 

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Opened Access Impact of structural disorder on the magnetic ordering and magnetocaloric response of amorphous Gd-based microwires.
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Author: Biswas, Anis
Yu, Yikyung
Bingham, Nicholas S.
Wang, Huan
Qin, Faxiang
Sun, Jianfei
Yu, Seongho
Franco García, Victorino
Srikanth, Hariharan
Phan, Manh Huong
Department: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Date: 2014
Published in: Journal of Applied Physics, 115 (17A318)
Document type: Article
Abstract: We have studied the impact of structural disorder on the magnetic ordering and magnetocaloric response of amorphous Gd 68 Ni 32 and Gd 53 Al 24 Co 20 Zr 3 microwires. We find that the presence of structural disorder significantly broadens the paramagnetic to ferromagnetic (PM-FM) transition and the temperature-dependent magnetic entropy change, while the nature of the second-order magnetic transition and long-range ferromagnetic order are not essentially affected by this effect. The large magnetic moment of Gd and the presence of the long-range ferromagnetic order are believed to result in a large magnetic entropy change, which together with the broadening of the PM-FM transition due to structural disorder contribute to a large refrigerant capacity. The excellent magnetocaloric properties of the amorphous microwires make them very promising candidates for active magnetic refrigeration.
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URI: http://hdl.handle.net/11441/33516

DOI: http://dx.doi.org/10.1063/1.4864143

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