Improved magnetic properties of Co0.5LaxFe2.5-xO4/FeCo composite powders by magnetic exchange-coupling effect

被引：8

作者：

Liang, Juli ^{[1
]}

Li, Zhile ^{[1
]}

Ma, Ke ^{[1
]}

Wu, Xuehang ^{[1
]}

Wu, Wenwei ^{[1
,2
]}

Xia, Jiuyang ^{[1
]}

Huang, Yifan ^{[3
]}

Huang, Yizhong ^{[3
]}

机构：

[1] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China

[2] Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, Nanning 530004, Peoples R China

[3] Guangxi Zhuang Autonomous Reg Ctr Anal & Test Res, Nanning 530022, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 491卷

关键词：

Ferrite; Hard/soft magnetic composites; Magnetic properties; Exchange-coupling; COBALT FERRITE NANOPARTICLES; COFE2O4; NANOPARTICLES; SATURATION MAGNETIZATION; THERMAL TRANSFORMATION; PARTICLES PREPARATION; KINETICS RESEARCH; BEHAVIOR; PARAMETERS; SIZE;

D O I：

10.1016/j.jmmm.2019.165596

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hard/soft Co0.5LaxFe2.5-xO4/CoFe composites have been synthesized by reduction process at 550 degrees C in 5% H-2-Ar atmosphere. As the precursor, Co0.5LaxFe2.5-xO4 is prepared by the ball-milling-assisted ceramic process. High-crystallized spinel Co(0.5)La(x)Fe(2.5-x)O(4 )ferrites are formed after calcined at 900 degrees C in air for 2 h. The Co0.5Fe2.5O4 shows the highest specific saturation magnetization (78.48 emu/g), remanence (30.82 emu/g), and effective anisotropy constant (62323.48 erg/g) compared with La3+ -doped Co0.5LaxFe2.5-xO4. By contrast, the specific saturation magnetization for Co0.5LaxFe2.5-xO4/CoFe composite, reduced at 550 degrees C for 20 min, exhibits an enhanced specific saturation magnetization (81.00 emu/g). The hysteresis loop for Co0.5LaxFe2.5-xO4/CoFe composites exhibits a good single-phase magnetic behavior. The improvement in magnetic properties for Co0.5LaxFe2.5-xO4/CoFe composites is attributed to the exchange-coupling interaction between the hard and soft phases.

引用

页数：10

共 40 条

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