From FePt-Fe3O4 to L10-FePt-Fe nanocomposite magnets with a gradient interface

被引：38

作者：

Yang, Weiwei ^{[1
]}

Lei, Wenjuan ^{[1
]}

Yu, Yongsheng ^{[1
,2
,3
]}

Zhu, Wenlei ^{[2
]}

George, T. A. ^{[3
]}

Li, X. -Z. ^{[3
]}

Sellmyer, D. J. ^{[3
]}

Sun, Shouheng ^{[2
]}

机构：

[1] Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150001, Heilongjiang, Peoples R China

[2] Brown Univ, Dept Chem, Providence, RI 02912 USA

[3] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2015年 / 3卷 / 27期

基金：

中国国家自然科学基金;

关键词：

EXCHANGE; NANOPARTICLES; PHASE;

D O I：

10.1039/c5tc01145k

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a novel approach for the fabrication of exchange-coupling L1(0)-FePt-bcc-Fe nanocomposites with a gradient interface between hard and soft phases from FePt nanoparticles (NPs) and FePt-Fe3O4 dumbbell shaped NPs, which are prepared by a facile one-pot synthesis method. High temperature annealing in argon is first used to convert FePt in FePt-Fe3O4 dumbbell shaped NPs to the L1(0)-FePt phase. Then Fe3O4 in FePt-Fe3O4 dumbbell shaped NPs is reduced to bcc-Fe by low temperature annealing in reducing gas, forming L1(0)-FePt-Fe nanocomposites. The L1(0)-FePt-Fe nanocomposites exhibit both large coercivity and high magnetic moment. The work demonstrates that creating a nanoscale gradient interface between magnetically hard and soft phases is a promising approach for the fabrication of high performance permanent magnets.

引用

页码：7075 / 7080

页数：6

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