Phase transitions and the magnetocaloric effect in Mn rich Ni–Mn–Ga Heusler alloys |
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| Authors: | Xuezhi Zhou Henry Kunkel Gwyn Williams Shuihe Zhang Xue Desheng |
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| Institution: | 1. Department of Physics and Astronomy, University of Manitoba Winnipeg R3T 2N2, Canada;2. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, PR China;3. Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou 730000, PR China |
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| Abstract: | In Mn rich polycrystalline Heusler alloys, Ni50Mn25+−xGa25−x, prepared by Arc melting, it is found that the structural/first-order magnetic transition temperature Tm increases as the Mn content increases. The Curie temperature Tc is higher than that of Ni rich alloys (Ni50+xMn25−xGa25 ) of the same series, and is less affected by composition x. Magnetic entropy change of |ΔSM| also increases as Mn content increases, while behaviour of the field dependence of ΔSM is similar to that of single crystal Ni52.6Mn23.1Ga24.3. |
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| Keywords: | Magnetocaloric effect Phase transition Magnetic entropy |
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