Phase coexistence and magnetic anisotropy in polycrystalline and nanocrystalline LaMnO3+δ

被引：24

作者：

Chandra, S. ^{[1
]}

Figueroa, A. I. ^{[1
,3
]}

Ghosh, Barnali ^{[2
]}

Phan, M. H. ^{[1
]}

Srikanth, H. ^{[1
]}

Raychaudhuri, A. K. ^{[2
]}

机构：

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] SN Bose Natl Ctr Basic Sci, Unit Nanosci, Kolkata 700098, India

[3] Univ Zaragoza, Inst Ciencia Mat Aragon, CSIC, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 07期

关键词：

D O I：

10.1063/1.3551734

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the phase coexistence and magnetic anisotropy in polycrystalline (bulk) and nanocrystalline (similar to 15 nm) LaMnO3+delta materials, which were prepared by solid state reaction and sol-gel methods, respectively. In addition to standard magnetization measurements, radio-frequency transverse susceptibility (TS) based on a very sensitive, self-resonant tunnel diode oscillator method was used to probe magnetic anisotropy and switching fields in the samples. The results revealed a coexistence of the ferromagnetic (FM) and antiferromagnetic (AFM) phases in both samples. For the bulk sample, the AFM phase significantly changed in volume fraction at similar to 30 K and completely vanished around 120 K. Size reduction to the nanometer scale (similar to 15 nm) significantly suppressed the AFM phase while inducing surface spin disorder in the material. The large magnetic anisotropies were probed by TS experiments in both samples. Our studies showed that the magnetic properties of bulk LaMnO3+delta were strongly modified by size reduction. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3551734]

引用

页数：3

共 15 条

[1] Mn4+ cation localization in La-rich La1-xCaxMnOy manganites [J].