Effects of microstructure on the magnetic properties of polycrystalline NiMn2O4 spinel oxides

被引：11

作者：

Freitas Cabral, A. J. ^{[1
]}

Remedios, C. M. R. ^{[2
]}

Gratens, X. ^{[3
]}

Chitta, V. A. ^{[3
]}

机构：

[1] Univ Fed Oeste Para, Santarem, PA, Brazil

[2] Univ Fed Para, Inst Ciencias Exatas & Nat, Belem, Para, Brazil

[3] Univ Sao Paulo, Inst Fis, Sao Paulo, SP, Brazil

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 469卷

基金：

巴西圣保罗研究基金会;

关键词：

Nickel manganite; Microstrain; Exchange bias; NICKEL MANGANITE; CATION DISTRIBUTION; SOL-GEL;

D O I：

10.1016/j.jmmm.2018.08.051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polycrystalline NiMn2O4 samples were synthesized by sol-gel method at 500 degrees C (S500), 700 degrees C (S700), and 800 degrees C (S800). The three samples were then structurally characterized by X-ray diffraction and Rietveld refinement. Results indicate that samples are single phase and crystallize in the Fd (3) over barm space group with spinel structure. Williamson-Hall analysis shows that samples present different lattice strains. NiMn2O4 compounds show the magnetic transition from ferrimagnetic to paramagnetic at nearly 100 K. Hysteresis loops measured at T = 1.7 K after cooling the samples under magnetic field are asymmetric along the field axis.

引用

页码：108 / 112

页数：5

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