Magnetic properties and large magnetic-field-induced strains in off-stoichiometric Ni-Mn-Al Heusler alloys

被引：197
|
作者：
Fujita, A [1 ]
Fukamichi, K [1 ]
Gejima, F [1 ]
Kainuma, R [1 ]
Ishida, K [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
来源：
APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 19期
关键词：
D O I：
10.1063/1.1323552
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic properties and magnetic-field-induced strains (MFIS) have been investigated for off-stoichiometric Ni-Mn-Al Heusler alloys with an ordered L2(1) structure. A clear martensitic transformation in Ni53Mn25Al22 alloy was revealed below the Curie temperature. In the polycrystalline specimen, an irreversible relative change due to the MFIS was confirmed between the martensite start and finish temperatures M-s and M-f, and a maximum relative length change DeltaL/L\(7T) of about -100 ppm was observed at just above M-f. On the other hand, a large irreversible relative length change of about 1000 ppm has been demonstrated in the magnetic field of 7 T for a single crystal cut from the polycrystalline specimen. A delay of the response of strains against the magnetic field was also confirmed. (C) 2000 American Institute of Physics. [S0003-6951(00)01645-4].
引用
收藏
页码：3054 / 3056
页数：3
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