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An, Kwangjin
Advanced Nanocatalysis Lab (An Lab)
Research Interests
  • Nanoparticle catalytsts, catalytic activity, selectivity, and stability, strong metal-support interactions, CO2 utilization, biomass conversion, Plastic Up-cycling

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

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dc.contributor.author Disch, S ko
dc.contributor.author Hermann, RP ko
dc.contributor.author Wetterskog, E ko
dc.contributor.author Podlesnyak, AA ko
dc.contributor.author An, Kwangjin ko
dc.contributor.author Hyeon, T ko
dc.contributor.author Salazar-Alvarez, G ko
dc.contributor.author Bergstrom, L ko
dc.contributor.author Bruckel, T ko
dc.date.available 2015-07-29T00:54:08Z -
dc.date.created 2015-07-28 ko
dc.date.issued 2014-02 -
dc.identifier.citation PHYSICAL REVIEW B, v.89, no.6, pp.064402-1 - 064402-7 ko
dc.identifier.issn 2469-9950 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12790 -
dc.identifier.uri http://journals.aps.org.library.unist.ac.kr:8010/prb/abstract/10.1103/PhysRevB.89.064402 ko
dc.description.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. ko
dc.description.statementofresponsibility open -
dc.language ENG ko
dc.publisher AMER PHYSICAL SOC ko
dc.subject MAGNETIC NANOPARTICLES ko
dc.subject MOSSBAUER-SPECTRA ko
dc.subject SCATTERING ko
dc.subject DYNAMICS ko
dc.subject PARTICLES ko
dc.subject NANOCRYSTALS ko
dc.subject GAMMA-FE2O3 ko
dc.title Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84894707686 ko
dc.identifier.wosid 000332370200003 ko
dc.type.rims ART ko
dc.description.wostc 2 *
dc.description.scopustc 2 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1103/PhysRevB.89.064402 ko
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