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

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Title
Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy
Author(s)
Disch S.; Hermann R.P.; Wetterskog E.; Podlesnyak A.A.; K. An; Taeg Hwan Hyeon; Salazar-Alvarez G.; Bergstrom L.; Th. Bruckel
Publication Date
2014-02
Journal
PHYSICAL REVIEW B, v.89, no.6, pp.064402 -
Publisher
AMER PHYSICAL SOC
Abstract
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.
URI
http://pr.ibs.re.kr/handle/8788114/1131
DOI
10.1103/PhysRevB.89.064402
ISSN
1098-0121
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Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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