Magnetic properties and magnetocaloric effects in Er1-xGdxCoAl intermetallic compounds

doi:10.1088/1674-1056/24/9/097502

Abstract The magnetism and magnetocaloric effect in Er_1-xGd_xCoAl (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1) were investigated. The Er_1-xGd_xCoAl compounds were synthesized by arc melting. With the increasing Gd content, the Néel temperature (T_N) linearly increases from 14 K to 102 K, while the magnetic entropy change (-Δ S_M) tends to decrease nonmonotonously. Under the field change from 0 T to 5 T, the-Δ S_M of the compounds with x = 0.2-1 are stable around 10 J/kg ·K, then a cooling platform between 20 K and 100 K can be formed by combining these compounds. For x = 0.6, 0.8, 1.0, the compounds undergo two successive magnetic transitions, one antiferromagnetism to ferromagnetism and the other ferromagnetism to paramagnetism, with increasing temperature. The two continuous magnetic transitions in this series are advantageous to broaden the temperature span of half-peak width (δ T) in the-Δ x_M-T curve and improve the refrigeration capacity.

Keywords: mgnetocaloric effect magnetic entropy change magnetic phase transformation

Received: 16 October 2014
Revised: 05 April 2015
Accepted manuscript online:

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	65.40.gd	(Entropy)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51322605 and 51271192).

Corresponding Authors: Shen Jun, Tang Cheng-Chun
E-mail: jshen@mail.ipc.ac.cn;tangcc@hebut.edu.cn

Cite this article:

Gao Xin-Qiang (高新强), Mo Zhao-Jun (莫兆军), Shen Jun (沈俊), Li Ke (李珂), Dai Wei (戴巍), Wu Jian-Feng (吴剑峰), Tang Cheng-Chun (唐成春) Magnetic properties and magnetocaloric effects in Er_1-xGd_xCoAl intermetallic compounds 2015 Chin. Phys. B 24 097502

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Magnetic properties and magnetocaloric effects in Er1-xGdxCoAl intermetallic compounds

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Magnetic properties and magnetocaloric effects in Er_1-xGd_xCoAl intermetallic compounds