Identification of magnetic properties of few nm sized FePt crystalline particles by characterizing the intrinsic atom order using aberration corrected S/TEM

被引：10

作者：

Biskupek, Johannes ^{[1
]}

Jinschek, Joerg R. ^{[2
]}

Wiedwald, Ulf ^{[3
]}

Bendele, Markus ^{[3
]}

Han, Luyang ^{[3
]}

Ziemann, Paul ^{[3
]}

Kaiser, Ute ^{[1
]}

机构：

[1] Univ Ulm, Cent Facil Electron Microscopy, D-89081 Ulm, Germany

[2] FEI Nanoport Europe, NL-5600 Eindhoven, Netherlands

[3] Univ Ulm, Inst Solid State Phys, D-89081 Ulm, Germany

来源：

ULTRAMICROSCOPY | 2010年 / 110卷 / 07期

关键词：

Aberration corrected HRTEM; Aberration corrected STEM; FePt; Image calculation; Chemical order; Magnetic nanoparticle; SPHERICAL-ABERRATION; NANOPARTICLES;

D O I：

10.1016/j.ultramic.2010.02.043

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

Hard-magnetic nanomaterials like nanoparticles of FePt are of great interest because of their promising potential for data storage applications. The magnetic properties of FePt structures strongly differ whether the crystal phases are face centered cubic (fcc) or face centered tetragonal (fct). We evaluated aberration corrected HRTEM, electron diffraction and aberration corrected HAADF-STEM as methods to measure the chemical degree of order S that describes the ordering of Pt and Fe atoms within the crystals unit cells. SiTEM experiments are accompanied by image calculations. The findings are compared with results obtained from X-ray diffraction on a FePt film. Our results show that STEM is a reasonable fast approach over HRTEM and electron diffraction to locally determine the chemical degree of order S. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：820 / 825

页数：6

共 28 条

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