Phase transitions and magnetic entropy change in Mn-rich Ni2MnGa alloys

被引：45
作者：
Albertini, F.
Paoluzi, A.
Pareti, L.
Solzi, M.
Righi, L.
Villa, E.
Besseghini, S.
Passaretti, F.
机构：
[1] IMEM CNR, I-43010 Parma, Italy
[2] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy
[3] CNISM, I-43100 Parma, Italy
[4] Univ Parma, Dipartimento Chim GIAF, I-43100 Parma, Italy
[5] IENI CNR, I-23900 Lecce, Italy
来源：
JOURNAL OF APPLIED PHYSICS | 2006年 / 100卷 / 02期
关键词：
D O I：
10.1063/1.2218470
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Thermomagnetic and magnetocaloric (MC) properties of Ni2MnGa Heusler alloys are found to be very sensitive to small composition variations. It is shown that the temperature behavior of ac susceptibility mimics that of MC properties of the samples. The coincidence of magnetic and structural transformations is found for a Mn-rich composition. As in the case of Ni-rich alloys, the magnetocaloric effect is enhanced at the transitions co-occurrence. The increase of Mn content, with respect to the stoichiometric value, rapidly decreases anisotropy field and saturation magnetization. (c) 2006 American Institute of Physics.
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页数：4
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