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几种元素的界面插层对Ta/NiFe/Ta的各向异性磁电阻效应的影响

许涌 蔡建旺

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几种元素的界面插层对Ta/NiFe/Ta的各向异性磁电阻效应的影响

许涌, 蔡建旺

Effects of interfacial Ru, Pd, Ag, and Au insertion layers on the anisotropic magnetoresistance in Ta/NiFe/Ta trilayers

Xu Yong, Cai Jian-Wang
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  • 文章中,通过磁控溅射制备了界面处插入4d,5d元素薄层(包括Ru,Pd,Ag和Au)的Ta/NiFe/Ta多层膜,并对它们的磁输运和磁性以及微结构进行了测试和表征.结果显示,Pd和Pt一样界面效应显著,能有效地提高NiFe薄膜退火前后的AMR比值,并抑制磁性死层.表面能比较小、熔点相对低的插层材料Ag,Au在退火过程中容易通过晶界扩散,强烈破坏其AMR性能.对于熔点高、表面能比较大的插层材料如Ru,磁性死层同样得到了抑制,NiFe薄膜的温度稳定性也可以得到提高.结果表明界面插层从界面电子自旋-轨道散射、界面死层和界面原子扩散等方面深刻影响NiFe薄膜的AMR.
    Ta/NiFe/Ta trilayers are commonly used in various commercial sensors based on anisotropic magnetoresistive(AMR) effect. Technologically it is desirable to reduce NiFe film thickness to diminish the demagnetization effect for the smaller and smaller devices. However, the AMR ratio of thin NiFe film decreases rapidly with film thickness decreasing when the NiFe film is thinner than 20 nm. Our previous work revealed that the AMR ratio and the thermal stability of Ta/NiFe/Ta trilayers can be significantly improved through interfacial Pt addition due to the enhanced interfacial spin-orbit scattering and the suppressed magnetic dead layers. In this paper, 4d and 5d elements including Ru, Pd, Ag and Au, are also introduced at the interfaces of Ta/NiFe/Ta films fabricated by DC magnetron sputtering. It is found that the insertion of interfacial Pd layers leads to an appreciable AMR enhancement in the as-sputtered state and after annealing. Insertion layers of Ag and Au with small surface energy and relatively low melting point suffer from thermal interdiffusion and seriously deteriorate the AMR of the annealed films, whereas Ru insertion layers exhibit improved thermal stability. The present results indicate that the AMR of Ta/NiFe/Ta films can be notably affected by the extremely thin interfacial insertion layers due to the changed interfacial spin-orbit scattering, magnetic dead layer and atomic interdiffusion.
    • 基金项目: 国家自然科学基金(批准号:10874216,50831002)资助的课题.
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  • [1]

    McGuire T R, Potter R I 1975 IEEE Trans. Magn. 11 1018

    [2]

    Wu D, Wei P, Johnston-Halperin E, Awschalom D D, Shi J 2008 Phys. Rev. B 77 125320

    [3]
    [4]
    [5]

    Rushforth A W, Vborn K, King C S, Edmonds K W, Campion R P, Foxon C T, Wunderlich J, Irvine A C, Vaek P, Novk V, Olejnk K, Sinova J, Jungwirth T, Gallagher B L 2007 Phys. Rev. Lett. 99 147207

    [6]

    Li P, Jiang E Y, Bai H L 2010 Appl. Phys. Lett. 96 092502

    [7]
    [8]
    [9]

    Ramos R, Arora S K, Shvets I V 2008 Phys. Rev. B 78 214402

    [10]

    Bibes M, Laukhin V, Valencia S, Martinez B, Fontcuberta J, Gorbenko O Y, Kaul A R, Martinez J L 2005 J. Phys.: Condens. Matter 17 2733

    [11]
    [12]

    Bibes M, Martnez B, Fontcuberta J, Trtik V, Ferrater C, Snchez F, Varela M, Hiergeist R, Steenbeck K 2000 J. Magn. Magn. Mater. 211 206

    [13]
    [14]

    Tsunoda M, Komasaki Y, Kokado S, Isogami S, Chen C C, Takahashi M 2009 Appl. Phys. Exp. 2 083001

    [15]
    [16]
    [17]

    Yau J B, Hong X, Posadas A, Ahn C H, Gao W, Altman E, Bason Y, Klein L, Sidorov M, Krivokapic Z 2007 J. Appl. Phys. 102 103901

    [18]

    Li R W, Wang H, Wang X, Yu X Z, Matsui Y, Cheng Z H, Shen B G, Plummere E W, Zhang J 2008 Proc. Natl. Acad. Sci. U.S.A. 106 14224

    [19]
    [20]
    [21]

    Egilmez M, Patterson R, Chow K H, Jung J 2007 Appl. Phys. Lett. 90 232506

    [22]
    [23]

    Jiang H W, Wang A L, Zheng W 2005 Acta Phys. Sin. 54 2338 (in Chinese) [姜宏伟、王艾玲、郑 鹉 2005 物理学报 54 2338]

    [24]
    [25]

    Miller B H, Stojkovi ć B P, Dahlberg E D 1999 Phys. Lett. A 256 294

    [26]
    [27]

    Ingvarsson S, Xiao G, Parkin S S P, Gallagher W J 2002 J. Magn. Magn. Mater. 251 202

    [28]
    [29]

    Lin T, Mauri D, York B, Rice P M 2004 Appl. Phys. Lett. 84 386

    [30]
    [31]

    Kowalewski M, Butler W H, Moghadam N, Stock G M, Schulthess T C, Song K J, Thompson J R, Arrott A S, Zhu T, Drewes J, Katti R R, McClure M T, Escorcia O 2000 J. Appl. Phys. 87 5732

    [32]
    [33]

    Miyazaki T, Ajima T 1989 J. Magn. Magn. Mater. 81 91

    [34]

    Liu Y F, Cai J W, Sun L 2010 Appl. Phys. Lett. 96 092509

    [35]
    [36]

    Kitada M, Yamamoto H, Tsuchiya H 1984 Thin Solid Films 122 173

    [37]
    [38]

    Mezey L Z, Giber J 1982 Jpn. J. Appl. Phys. 21 1569

    [39]
    [40]
    [41]

    Egelhoff W F, Chen P J, Powell C J, Stiles M D, McMichael R D, Lin C L, Sivertsen J M, Judy J H, Takano K, Berkowitz A E 1996 J. Appl. Phys. 80 5183

    [42]
    [43]

    Kitakami O, Shimada Y, Oikawa K, Daimon H, Fukamichi K 2001 Appl. Phys. Lett. 78 1104

    [44]
    [45]

    Nagura H, Saito K, Takanashi K, Fujimori H 2000 J. Magn. Magn. Mater. 212 53

    [46]

    Yu G H, Zhao H C, Li M H, Zhu F W, Lai W Y 2002 Appl. Phys. Lett. 80 455

    [47]
    [48]

    Moghadam N Y, Stocks G M 2005 Phys. Rev. B 71 134421

    [49]
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出版历程
  • 收稿日期:  2011-04-25
  • 修回日期:  2011-05-04
  • 刊出日期:  2011-11-15

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