Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy

[en] We have determined the field dependence of collective magnetic excitations in iron oxide nanoparticles of cubic shape with 8.42(2) nm edge length and a narrow log normal size distribution of 8.2(2)% using time-of-flight neutron spectroscopy. The energy dependence of the uniform precession modes was investigated up to 5 T applied field and yields a Landé factor g=2.05(2) as expected for maghemite (γ-Fe2O3) nanoparticles. A large effective anisotropy field of BA,eff=0.45(16) T was determined, in excellent agreement with macroscopic measurements. This anisotropy is attributed to enhanced shape anisotropy in these monodisperse cubic nanoparticles. The combination of our results with macroscopic magnetization information provides a consistent view of the energy scales of superparamagnetic relaxation and collective magnetic excitations in magnetic nanoparticles. © 2014 American Physical Society.

Disciplines :

Physics

Author, co-author :

Disch, S.; Jülich Centre for Neutron Science JCNS, Peter Grünberg Institut PGI, Forschungszentrum Jülich, D-52425 Jülich, Germany, Institut Laue-Langevin, F-38042 Grenoble, France

Hermann, Raphaël ; Université de Liège > Département de chimie (sciences) > Département de chimie (sciences)

Wetterskog, E.; Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, Sweden

Podlesnyak, A. A.; Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States

An, K.; Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, South Korea, School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, South Korea

Hyeon, T.; Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, South Korea, School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, South Korea

Salazar-Alvarez, G.; Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, Sweden

Bergström, L.; Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, Sweden

Brückel, T.; Jülich Centre for Neutron Science JCNS, Peter Grünberg Institut PGI, Forschungszentrum Jülich, D-52425 Jülich, Germany

Language :

English

Title :

Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy

Publication date :

2014

Journal title :

Physical Review. B, Condensed Matter and Materials Physics

ISSN :

1098-0121

eISSN :

1550-235X

Publisher :

American Physical Society, United States - Maryland

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 01 June 2015

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