具有横向磁晶各向异性的钴纳米线的微波吸收性能

陈文兵; 韩满贵; 邓龙江

doi:10.7498/aps.60.017507

摘要

使用电化学脉冲沉积法制备了磁晶各向异性易磁化方向(c轴)垂直纳米线长轴方向的钴纳米线.受到磁晶各向异性、静磁相互作用等因素与形状各向异性相互竞争的结果,纳米线阵列的磁滞回线显示出较弱的磁各向异性.此外,在2—18 GHz频率范围内,纳米线/石蜡复合材料的介电色散谱的虚部在5 GHz处有一个主峰,在10 GHz附近有一个较弱的峰;德拜弛豫特性和材料的电导率对这两个峰的形成均有贡献.同时,其磁导率色散谱的虚部在频率为6.1 GHz处有一个主峰,在10 GHz以上有两个较微弱的峰. 前一个峰源于自

关键词:

Abstract

Cobalt nanowires with c-axis perpendicular to the axial direction have been fabricated by the pulsed electrodeposition method. The hysterisis loops of the cobalt nanowire array show little anisotropy due to the competition between shape anisotropy and factors such as magnetocrystalline anisotropy and magnetostatic interaction. The permittivity and permeability dispersion spectra of the nanowire/paraffin composite were measured in the frequency range of 2—18 GHz. It was found that the imaginary part of the permittivity spectra shows a strong peak around 5 GHz and a weak peak around 10 GHz, which are contributed by the Debye relaxation and the conductivity of the nanowires. In the meantime, the imaginary part of the permeability spectra for the nanowire/paraffin composite samples exhibits a strong absorption peak at 6.1 GHz and two minor peaks above 10 GHz. The peak at 6.1 GHz is attributed to the natural resonance mechanism and the other two peaks are duc to eddy current effect. The permeability spectra attributed to natural resonance are fitted using the Landau–Lifshitz–Gilbert equation. Calculation based on the Kittel equation substantiates our fitting results. The electromagnetic wave reflection loss of the nanowire/paraffin composite sample is lower than -20 dB when the thickness of the nanowire/paraffin composite has been adjusted, suggesting that the cobalt nanowire composites can find application as a novel type of microwave absorbers.

Keywords:

作者及机构信息

1.
电子科技大学电子薄膜与集成器件国家重点实验室,成都 610054

基金项目: 国家自然科学基金(批准号: 60701016)及国家自然科学基金委员会与英国皇家学会国际合作项目(批准号: 60911130130)资助的课题.

Authors and contacts

1.
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

参考文献

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施引文献

[1]	Yan J F, Zhang Z Y, You T G, Zhao W, Yun J N, Zhang F C 2009 Chin. Phys. B 18 4552
[2]	Budnick J I, Taylor G W 2002 Appl. Phys. Lett. 80 4404
[3]	Han M G, Ou Y, Liang D F, Deng L J 2009 Chin. Phys. B 18 1601
[4]	Liu X G, Geng D Y, Meng H, Shang P J, Zhang Z D 2008 Appl. Phys. Lett. 92 173117
[5]	Zhang X F, Dong X L, Huang H, Liu Y Y, Wang W N, Zhu X G, Lv B, Lei J P, Lee C G 2006 Appl. Phys. Lett. 89 053115
[6]	Liu Q L, Zhang D, Fan T X 2008 Appl. Phys. Lett. 93 013110
[7]	Dong X L, Zhang X F, Huang H, Zuo F 2008 Appl. Phys. Lett. 92 013127
[8]	Ma Q, Jiang J J, Bie S W, Du G, Feng Z K, He H H 2008 Acta. Phys. Sin. 57 6577 (in Chinese)[马强、江建军、别少伟、杜刚、冯则坤、何华辉 2008 57 6577]
[9]	Zhao D L, Zeng X W, Shen Z M 2005 Acta. Phys. Sin. 54 3878 (in Chinese)[赵东林、曾宪伟、沈曾民 2005 54 3878]
[10]	Ma Q, Jiang J J, Bie S W, Tian B, Liang P, He H H 2009 Chin. Phys. B 18 2063
[11]	Han Z, Li D, Wang H, Liu X G., Li J, Geng D Y, Zhang Z D 2009 Appl. Phys. Lett. 95 023114
[12]	Gong Y X, Zhen L, Jiang J T, Xu C Y, Shao W Z 2009 J. Appl. Phys. 106 064302
[13]	Encinas A, Vila L, Darques M, George J M, Piraux L 2007 Nanotechnology 18 065705
[14]	Darques M, Encinas A, Vila L, Piraux L 2004 J. Phys. D: Appl. Phys. 37 1411
[15]	Darques M, Piraux L, Encinas A, Bayle-Guillemaud P, Popa A, Ebels U 2005 Appl. Phys. Lett. 86 072508
[16]	Zhang J, Jones G A, Shen T H, Donnelly S E, Li G H 2007 J. Appl. Phys. 101 054310
[17]	Ursache A, Goldbach J T, Russell T P, Tuominen M T 2005 J. Appl. Phys. 97 10J322
[18]	Han X H, Liu Q F, Wang J B, Li S L, Ren Y, Liu R L, Li F S 2009 J. Phys. D: Appl. Phys. 42 095005
[19]	Li D D, Thompson R S, Bergmann G, Lu J G 2008 Adv. Mater. 20 4575
[20]	Qunadjela K, Ferré R, Louail L, George J M, Maurice J L, Piraux L, Dubois S 1997 J. Appl. Phys. 81 5455
[21]	Encinas-Oropesa A, Demand M, Piraux L, Huynen I, Ebels U 2001 Phys. Rev. B 63 104415
[22]	http: //math. nist. gov/oommf
[23]	Xu D W, Gao H, Xue D S 2007 Acta. Phys. Sin. 56 7274(in Chinese)[徐东伟、高华、薛德胜 2007 56 7274]
[24]	Deng L J, Han M G 2007 Appl. Phys. Lett. 91 023119
[25]	Jiang M J, Dang Z M, Bozlar M, Miomandre F, Bai J 2009 J. Appl. Phys. 106 084902
[26]	Liao S B 1998 Ferromagnetism (Beijing: Science Press) pp6—139 (in Chinese)[廖绍彬 1998 铁磁学(北京: 科学出版社)第6—139页]
[27]	Wu M Z, Zhang Y D, Hui S, Xiao T D, Ge S H, Hines W A,
[28]	Goglio G, Pignard S, Radulescu A, Piraux L, Huynen I, Vanhoenacker D, Vorst A V 1999 Appl. Phys. Lett. 75 1769
[29]	Cao J W, Huang Y H, Zhang Y, Liao Q L, Deng Z Q 2008 Acta. Phys. Sin. 57 3641(in Chinese)[曹佳伟、黄运华、张跃、廖庆亮、邓战强 2008 57 3641]
[30]	Shi X L, Cao M S, Yuan J, Fang X Y 2009 Appl. Phys. Lett. 95 163108

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