A two-way magnetic field controlled shape memory effect has been observed in single crystals of CoNiGa with martensitic transformation temperature ranging from 205 to 341 K. Two-way shape memory with −2.3% strain has been obtained in free samples. By applying a bias field of up to 2 T, the shape memory strain can be continuously controlled from negative 2.3% to positive 2.2% giving it a total strain of 4.5%. The magnetic properties of CoNiGa show that it is a good shape memory material working at relatively high temperature of up to 450 K, and has a lower magnetic anisotropy than NiMnGa.
REFERENCES
1.
P. J.
Webster
, K. R. A.
Ziebeck
, S. L.
Town
, and M. S.
Peak
, Philos. Mag. B
49
, 295
(1984
).2.
K.
Ullakko
, J. K.
Huang
, C.
Kantner
, R. C.
O’Handley
, and V. V.
Kokorin
, Appl. Phys. Lett.
69
, 1966
(1996
).3.
4.
G. H.
Wu
, C. H.
Yu
, L. Q.
Meng
, J. L.
Chen
, F. M.
Yang
, S. R.
Qi
, W. S.
Zhan
, Z.
Wang
, Y. F.
Zheng
, and L. C.
Zhao
, Appl. Phys. Lett.
75
, 2990
(1999
).5.
V. A.
Chernenko
, C.
Segui
, E.
Cesari
, J.
Pons
, and V. V.
Kokorin
, Phys. Rev. B
57
, 2659
(1995
).6.
7.
8.
9.
A.
Fujita
, K.
Fukamichi
, F.
Gejima
, R.
Kainuma
, and K.
Ishida
, Appl. Phys. Lett.
77
, 3054
(2000
).10.
11.
T.
Kakeshita
, T.
Takeuchi
, T. M.
Tsujiguchi
, T.
Saburi
, R.
Oshima
, and S.
Muto
, Appl. Phys. Lett.
77
, 1502
(2000
).12.
K.
Oikawa
, L.
Wulff
, T.
Iijima
, F.
Gejima
, A.
Ohmori
, A.
Fujita
, K.
Fukamichi
, R.
Kainuma
, and K.
Ishida
, Appl. Phys. Lett.
79
, 3290
(2001
).13.
H.
Morito
, A.
Fujita
, K.
Fukamichi
, R.
Kainuma
, and K.
Ishida
, Appl. Phys. Lett.
81
, 1657
(2002
).14.
C.
Craciunescu
, Y.
Kishi
, T. A.
Lograsso
, and M.
Wuttig
, Scr. Mater.
47
, 285
(2002
).15.
16.
M.
Sato
, T.
Okazaki
, Y.
Furuya
, T.
Kubota
, C.
Saito
, and M.
Wuttig
, J. Jpn. Inst. Met.
66
, 147
(2002
).17.
Y.
Kishi
, C.
Craciunescu
, M.
Sato
, T.
Okazaki
, Y.
Furuya
, and M.
Wuttig
, J. Magn. Magn. Mater.
262
, L186
(2003
).18.
K.
Oikawa
, T.
Ota
, F.
Gejima
, T.
Ohmori
, R.
Kainuma
, and K.
Ishida
, Mater. Trans., JIM
42
, 2472
(2001
).19.
W. H.
Wang
, G. H.
Wu
, J. L.
Chen
, W. S.
Zhan
, Z.
Wang
, Z. Y.
Gao
, and L. C.
Zhao
, Appl. Phys. Lett.
77
, 3245
(2000
).20.
V. V.
Kokorin
, V. A.
Chernenko
, E.
Cesari
, J.
Pons
, and C.
Segui
, J. Phys.: Condens. Matter
8
, 6457
(1996
).21.
A.
Zheludev
, S. M.
Shapiro
, P.
Wochner
, A.
Schwartz
, M.
Wall
, and L. E.
Tanner
, Phys. Rev. B
51
, 11310
(1995
).
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