FePt3/CoFe2O4 core/shell nanostructures and their magnetic properties

被引：24

作者：

Akbari, Hossein ^{[1
]}

Sebt, Seyed Ali ^{[1
]}

Arabi, Hadi ^{[2
]}

Zeynali, Hossein ^{[1
]}

Elahi, Mohhamad ^{[1
]}

机构：

[1] Islamic Azad Univ, Dept Phys, Sci & Res Branch, Tehran, Iran

[2] Univ Birjand, Dept Phys, Magnet & Superconducting Res Lab, Birjand, Iran

来源：

CHEMICAL PHYSICS LETTERS | 2012年 / 524卷

关键词：

L1(0) FEPT NANOPARTICLES; FILMS; MICROSTRUCTURE; NANOCRYSTALS; AG;

D O I：

10.1016/j.cplett.2011.12.046

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Monodisperse 2 nm Fe100-xPtx nanoparticles were synthesized using polyol process. As-synthesized FePt (x = 37) and FePt3 (x = 66) nanoparticles have the chemically-disordered face-centred cubic (fcc) structure. To achieve ordered structure (L1(2) phase), high-temperature annealing is required. During annealing, coalescence occurs and large agglomeration is formed with multi-domain particles. Core/shell structure, CoFe2O4 as a shell, is prepared to prevent the uncontrolled agglomeration. The shell thickness of CoFe2O4 is changed and controlled by varying ratio of initial precursor. The results show a decrease in coercivity by increasing shell thickness. This reveals effective exchange coupling between core and shell and confirms that shell thickness has a major role in magnetic properties of FePt3/CoFe2O4 nanoparticles. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：78 / 83

页数：6

共 34 条

[31] Direct synthesis and size selection of ferromagnetic FePt nanoparticles [J].

Wellons, Matthew S. ;

Morris, William H., III ;

Gai, Zheng ;

Shen, Jian ;

Bentley, James ;

Wittig, James E. ;

Lukehart, Charles M. .

CHEMISTRY OF MATERIALS, 2007, 19 (10) :2483-2488

[32] Bimagnetic core/shell FePt/Fe3O4 nanoparticles [J].

Zeng, H ;

Li, J ;

Wang, ZL ;

Liu, JP ;

Sun, SH .

NANO LETTERS, 2004, 4 (01) :187-190

[33] Chemical ordering of FePt nanoparticle self-assemblies by rapid thermal annealing [J].

Zeng, H ;

Sun, SH ;

Sandstrom, RL ;

Murray, CB .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2003, 266 (1-2) :227-232

[34] Exchange-coupled nanocomposite magnets by nanoparticle self-assembly [J].

Zeng, H ;

Li, J ;

Liu, JP ;

Wang, ZL ;

Sun, SH .

NATURE, 2002, 420 (6914) :395-398

← 1 2 3 4 →