Field dependence of the interfacial Cu in Cu-coated γ-Fe2O3 nanoparticles

被引：5

作者：

Desautels, R. D. ^{[1
]}

Chen, Y. -Y. ^{[2
]}

Ouyang, H. ^{[2
]}

Lo, S. -C. ^{[3
]}

Freeland, J. W. ^{[4
]}

van Lierop, J. ^{[1
]}

机构：

[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[2] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

[3] Ind Technol Res Inst, Mat & Chem Res Labs, Hsinchu 310, Taiwan

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 07期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1063/1.3676228

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Evidence of elemental copper magnetism in Cu-coated gamma-Fe2O3 nanoparticles was revealed by element specific x-ray absorption spectroscopy and magnetic circular dichroism (XMCD). An interfacial layer of magnetic CuO was discovered that interacted with the Fe3+ surface magnetic moments. This unexpected exchange interaction canted the moments of the CuO, so that a non-zero net magnetic moment was measured. XMCD measurements as a function of field on the copper coated gamma-Fe2O3 nanoparticles indicated that the CuO magnetic moment was aligned with the octahedral Fe3+ and its magnetization was modified by the changing applied field. With increasing copper thickness, a stronger field dependence of the Fe3+ and Cu2+ magnetization was observed. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676228]

引用

页数：3

共 9 条

[1] Magnetic order in γ-Fe2O3 nanoparticles:: a XMCD study [J].

Brice-Profeta, S ;

Arrio, MA ;

Tronc, E ;

Menguy, N ;

Letard, I ;

Moulin, CCD ;

Noguès, M ;

Chanéac, C ;

Jolivet, JP ;

Sainctavit, P .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, 288 :354-365

[2] Tuning the surface magnetism of γ-Fe2O3 nanoparticles with a Cu shell [J].

Desautels, R. D. ;

Skoropata, E. ;

Chen, Y. -Y. ;

Ouyang, H. ;

Freeland, J. W. ;

van Lierop, J. .

APPLIED PHYSICS LETTERS, 2011, 99 (26)

[3] Vacancy-Mediated Magnetism in Pure Copper Oxide Nanoparticles [J].

Gao, Daqiang ;

Zhang, Jing ;

Zhu, Jingyi ;

Qi, Jing ;

Zhang, Zhaohui ;

Sui, Wenbo ;

Shi, Huigang ;

Xue, Desheng .

NANOSCALE RESEARCH LETTERS, 2010, 5 (04) :769-772

[4] Formation of air-stable copper-silver core-shell nanoparticles for inkjet printing [J].

Grouchko, Michael ;

Kamyshny, Alexander ;

Magdassi, Shlomo .

JOURNAL OF MATERIALS CHEMISTRY, 2009, 19 (19) :3057-3062

[5] A new nonhydrolytic single-precursor approach to surfactant-capped nanocrystals of transition metal oxides [J].

Rockenberger, J ;

Scher, EC ;

Alivisatos, AP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1999, 121 (49) :11595-11596

[6] RECENT ADVANCES IN MAGNETIC-STRUCTURE DETERMINATION BY NEUTRON POWDER DIFFRACTION [J].

RODRIGUEZCARVAJAL, J .

PHYSICA B, 1993, 192 (1-2) :55-69

[7] The effect of surface spin disorder on the magnetism of γ-Fe2O3 nanoparticle dispersions [J].

Shendruk, T. N. ;

Desautels, R. D. ;

Southern, B. W. ;

van Lierop, J. .

NANOTECHNOLOGY, 2007, 18 (45)

[8]

Tai Y.-C., ANAL FE2O3 COR UNPUB

[9] Microstructure control of Zn/ZnO core/shell nanoparticles and their temperature-dependent blue emissions [J].

Zeng, Haibo ;

Li, Zhigang ;

Cai, Weiping ;

Cao, Bingqiang ;

Liu, Peisheng ;

Yang, Shikuan .

JOURNAL OF PHYSICAL CHEMISTRY B, 2007, 111 (51) :14311-14317

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