Microwave absorbing properties of cobalt nanowires with transverse magnetocrystalline anisotropy

Chen Wen-Bing; Han Man-Gui; Deng Long-Jiang

doi:10.7498/aps.60.017507

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:

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

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Cited By

[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 物理学报 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 物理学报 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 物理学报 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 物理学报 57 3641]
[30]	Shi X L, Cao M S, Yuan J, Fang X Y 2009 Appl. Phys. Lett. 95 163108

Catalog

Vol. 60, Issue 1 - 2011-01-05

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