Nanocrystalline multiferroic BiFeO3 thin films made by room temperature sputtering and thermal annealing, and formation of an iron oxide-induced exchange bias

被引:30
作者
Couture, P. [1 ,2 ,3 ]
Williams, G. V. M. [2 ,3 ]
Kennedy, J. [1 ,3 ]
Leveneur, J. [1 ,3 ]
Murmu, P. P. [1 ]
Chong, S. V. [3 ,4 ]
Rubanov, S. [5 ]
机构
[1] GNS Sci, Natl Isotope Ctr, 30 Gracefield Rd,POB 31312, Lower Hutt 5010, New Zealand
[2] Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand
[3] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, SCPS, POB 600, Wellington 6140, New Zealand
[4] Victoria Univ Wellington, Robinson Res Inst, POB 33436, Lower Hutt 5046, New Zealand
[5] Univ Melbourne, Inst Bio21, Melbourne, Vic 3010, Australia
关键词
Multiferroic; BiFeO3; Ion beam sputtering; Nanoparticles; Exchange bias; DEPENDENT MAGNETIC-PROPERTIES; SIZE; NANOPARTICLES; RAMAN; SUBSTITUTION; MAGHEMITE; SENSOR;
D O I
10.1016/j.jallcom.2016.11.344
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Multiferroic nanocrystalline BiFeO3 films have been successfully made by room temperature sputtering and thermal annealing in oxygen at 500 degrees C. Nanocrystalline Bi was seen before annealing as well as beta-Bi2O3 and the iron oxide phases, magnetite, maghemite, and FeO. Superparamagnetism was observed that can be attributed to magnetite and maghemite nanoparticles. The thermally annealed film contained BiFeO3 nanoparticles and magnetite, maghemite, and hematite as well as unidentified BiFexOy phases. Superparamagnetism was also seen after annealing and the magnetic properties are predominately due to magnetite and maghemite nanoparticles rather than from multiferroic BiFeO3. The saturation magnetic moment was 60% lower after annealing, which was due to some of the Fe in the iron oxide nanoparticles being incorporated into the BiFeO3 nanoparticles. An exchange bias was observed before and after annealing that cannot be attributed to a structure that includes BiFeO3. It is likely to arise from magnetite and maghemite cores with spin-disordered shells. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:3061 / 3068
页数:8
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