A quantitative analysis of magnetic vortices in Permalloy nanoparticles characterized by electron holography

被引：16

作者：

Ammar, M. ^{[1
,2
]}

LoBue, M. ^{[1
]}

Snoeck, E. ^{[3
]}

Hytch, M. ^{[3
]}

Champion, Y. ^{[3
]}

Barrue, R. ^{[1
]}

Mazaleyrat, F. ^{[1
]}

机构：

[1] UniverSud, CNRS, ENS, SATIE, F-94230 Cachan, France

[2] UniverSud, CNRS UMR 8622, IUT Cachan, UPS,IEF, F-91405 Orsay, France

[3] CNRS UPR 8011, CEMES, F-31055 Toulouse 4, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 20期

基金：

中国国家自然科学基金;

关键词：

Permalloy nanoparticles; vortex; quantitative electron holography; micromagnetic modeling;

D O I：

10.1016/j.jmmm.2008.04.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present work investigates experimentally curling magnetic configurations locally observed in almost dispersed Permalloy nanoparticles in the remanent state. Magnetic analysis is performed in a field emission TEM using off-axis electron holography. Particularly, electron holography is used to characterize the magnetic microstructure of Fe30Ni70 nanoparticles, whose average diameter (50 nm) is expected to be close to the critical size for a curling magnetic structure (vortex) formation. The vortex core diameter D-core and the bulk magnetic profile of the vortex are measured and compared with a " rigid vortex'' micromagnetic model. The connection between vortex structure and the characteristic micromagnetic length of the system deduced from magnetization curve measurements is discussed. (C) 2008 Elsevier B. V. All rights reserved.

引用

页码：E716 / E719

页数：4

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