The exchange bias behavior of BiFeO3 nanoparticles with natural core-shell structure

被引：36
作者：
Huang, Fengzhen [1 ,2 ,3 ]
Xu, Xingyu [1 ,2 ]
Lu, Xiaomei [1 ,2 ,3 ]
Zhou, Min [1 ,2 ]
Sang, Hai [1 ,2 ,3 ]
Zhu, Jinsong [1 ,2 ,3 ]
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Phys Sch, Nanjing 210093, Jiangsu, Peoples R China
[3] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
来源：
SCIENTIFIC REPORTS | 2018年 / 8卷
基金：
中国国家自然科学基金;
关键词：
DEPENDENT MAGNETIC-PROPERTIES;
D O I：
10.1038/s41598-018-19676-5
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The surface and interface effects of small antiferromagnetic nanostructures are important on the modulation of their magnetic properties. In this report, temperature and particle size dependent magnetic exchange bias effect was investigated in BiFeO3 (BFO) nanoparticles that possess natural core-shell structure. Nonmonotonic variation of exchange bias field, interesting surface spin-glass state and improved exchange bias training effect are only obtained in 18 nm BFO particles. Based on comparative experiments on particles with different sizes, we found that the surface spins and the interaction among them show great effect on the interfacial exchange coupling of the core-shell structure, and thus are responsible for the peculiar exchange bias behavior in small BFO nanoparticles. Our work provides the effect of surface spin state on the magnetic characteristics of nanomaterials and will favor their applications on spintronic devices.
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页数：6
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