Nanometer Size Effect on Structural and Magnetic Properties of La0.2Ca0.8MnO3

被引:5
作者
Markovich, V. [1 ]
Mogilyansky, D. [2 ]
Wisniewski, A. [3 ]
Fita, I. [3 ,4 ]
Puzniak, R. [3 ]
Iwanowski, P. [3 ]
Wu, X. D. [5 ]
Suzuki, K. [5 ]
Chen, S. [5 ]
Gorodetsky, G. [1 ]
机构
[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[2] Ben Gurion Univ Negev, Analyt Res Serv & Instrumentat Unit, IL-84105 Beer Sheva, Israel
[3] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[4] Natl Acad Sci, Donetsk Inst Phys & Technol, UA-83114 Donetsk, Ukraine
[5] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia
关键词
Nanocrystalline Manganites; Magnetization; Particle Size; Spin-Glass; EXCHANGE BIAS;
D O I
10.1166/jnn.2012.6834
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Structural and magnetic properties of La0.2Ca0.8MnO3 nanoparticles with average size of 15-37 nm, prepared by the glycine nitrate method, have been studied. Synchrotron experiments performed in the temperature range of 80-300 K have shown that a structural transition from room temperature orthorhombic Pnma to monoclinic P2(1)/m space group, associated with orbital ordering, occurs below 200 K in the studied particles. This transition observed for the largest particles of 37 nm is very close to that of bulk, as seen by similar temperature variation of lattice parameters and orthorhombic strain. The transition is highly suppressed for smaller 15 nm particles. Horizontal and vertical shifts of magnetic hysteresis loops (M-shift and H-EB), displayed in a field cooled process, indicate size dependent exchange bias effect. It is also shown that M-shift and H-EB, as well as the remanent magnetization M-r and coercive field H-C at low temperatures, exhibit a non-monotonic size dependence for particles around 23 nm. These effects may be attributed to the changes in uncompensated spins at the surface, anisotropy or alternatively to a transition from a multi-domain to the single domain state.
引用
收藏
页码:8607 / 8612
页数:6
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