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文章研究了Cu替代部分Ni对铁磁性形状记忆合金Ni50Mn36In14相变和磁性的影响规律. 研究表明,在Ni50-xCuxMn36In14中,随着Cu含量的增加,相变温度逐渐降低. Cu含量低于5%时,奥氏体的磁性强于马氏体的磁性, 母相和马氏体相的饱和磁化强度的差值ΔM随着Cu含量的增加而增大. 当Cu含量x=4.5时, ΔM迅速增加到80 emu/g, 并在该材料中观察到了磁场驱动的马氏体到奥氏体的转变,显示了该材料作为磁驱动磁电阻材料的潜在应用前景.当Cu含量高于5%时,奥氏体保持铁磁状态, 马氏体相由反铁磁状态变为铁磁状态,马氏体的磁性强于奥氏体的磁性, ΔM大大削弱,磁场驱动性质消失.In this paper, we investigate the magnetic and martensitic transformation properties of Cu doping partial Ni in Ni50Mn36In14 alloy. It is found that the critical temperature of the martensitic transformation decreases with Cu concentration x in Ni50-xCuxMn36In14 increases. While Cu concentration is less than 5% at., the magnetization of austenite phase is stronger than that of martensite phase, and ΔM of magnetization martensite and austenite increases with Cu doping. ΔM increases rapidly to 80 emu/g when x=4.5 and a field-induced transformation is observed in this alloy, predicting the application potential as the magnetic actuation and magnetoresistance materials. As Cu content increases to x > 5, the magnetization of austenite becomes weaker than that of martnensite, ΔM decreases to near zero.
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[1] Ullakko K, Huang J K, Kantner C, Ohandley R C, Kokorin V V 1996 Appl. Phys. Lett. 69 1966
[2] Liu Z H, Hu F X, Wang W H, Chen J L, Wu G H, Gao S X, Ao L 2001 Acta Phys. Sin. 50 233 (in Chinese) [柳祝红, 胡凤霞, 王文洪, 陈京兰, 吴光恒, 高淑霞, 敖玲 2001 50 233]
[3] Fujita A, Fukamichi K, Gejima F, Kainuma R, Isshida K 2001 Appl. Phys. Lett. 77 3054
[4] Morito H, Fujita A, Fukamichi K, Kainuma R, Ishida K, Oikawa K 2003 Appl. Phys. Lett. 83 4993
[5] Wuttig M, Li J, Craciunescu C 2001 Scrip. Mater. 44 2393
[6] Oikawa K, Wulff L, Iijima T, Gejima F, Ohmori T, Fujita A, Fukamichi A, Kainuma R, Isshida K 2001 Appl. Phys. Lett. 79 3290
[7] Murrey S J, Marioni M, Allen S M, O'Handley R C 2000 Appl. Phys. Lett. 77 886
[8] Likhachev A A, Ullakko K 2000 Eur. Phys. J. B 14 263
[9] Kainuma R, Imano Y, Ito W, Sutou Y, Morito H, Okamoto S, Kitakami O, Oikawa K 2006 Nature 439 957
[10] Oikawa K, Ito W, Imato Y, Sutou Y, Kainuma R, Ishida K, Okamoto S, Kitakami O, Kanomata T 2006 Appl. Phys. Lett. 88 122507
[11] Koyama K, Watanabe K, Kanomata T, Kainuma R, Oikawa K, Ishida K 2006 Appl. Phys. Lett. 88 132505
[12] Yu S Y, Liu Z H, Liu G D, Chen J L, Cao Z X, Wu G H, Zhang B, Zhang X X 2006 Appl. Phys. Lett. 89 162503
[13] Han Z D, Wang D H, Zhang C L, Tang S L, Gu B X, Du Y W 2006 Appl. Phys. Lett. 89 182507
[14] Krenke T, Acet M, Wassermann E F, Moya X, Ma\ nosa L, Planes A 2006 Phys. Rev. B 73 174413
[15] Smit J 1978 J. Phys. F: Metal Phys. 8 2139
[16] Chernenko V A 1999 Scripta Mater. 40 523
[17] Sterns M B 1979 J. Appl. Phys. 50 2060
[18] Sterns M B 1980 J. Magn. Magn. Mater. 15-18 301
[19] Webster P J 1969 Contemp. Phys. 10 559
[20] Enkovaara J, Heczko O, Ayuela A, Nieminen R M 2003 Phys. Rev. B 67 212405
[21] Brown P J, Gandy A P, Ishida K, Kainuma R, Kanomata T, Neumann K U, Oikawa K, Ouladdiaf B, Ziebeck K RA 2006 J. Phys.: Condens. Matter 18 2249
[22] Webster P J 1981 J. Appl. Phys. 52 2040
[23] Paranjpe S K, Begum R J J. Magn. Magn. Mater. 15-18 477
[24] Brown P J, Bargawi A Y, Crangle J, Neumann K U, Ziebeck K R A 1999 J. Phys. Condens. Matter 11 4715
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