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000151434 0247_ $$2doi$$a10.1103/PhysRevB.89.064402
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000151434 0247_ $$2ISSN$$a1098-0121
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000151434 1001_ $$0P:(DE-HGF)0$$aWetterskog, E.$$b0
000151434 245__ $$aSpin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy
000151434 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000151434 520__ $$aWe 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.
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000151434 7001_ $$0P:(DE-HGF)0$$aPodlesnyak, A. A.$$b2
000151434 7001_ $$0P:(DE-HGF)0$$aAn, K.$$b3
000151434 7001_ $$0P:(DE-HGF)0$$aHyeon, T.$$b4
000151434 7001_ $$0P:(DE-HGF)0$$aSalazar-Alvarez, G.$$b5
000151434 7001_ $$0P:(DE-HGF)0$$aBergström, L.$$b6
000151434 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Th.$$b7
000151434 7001_ $$0P:(DE-Juel1)130706$$aHermann, Raphael$$b8
000151434 7001_ $$0P:(DE-HGF)0$$aDisch, Sabrina$$b1$$eCorresponding author
000151434 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.89.064402$$bAmerican Physical Society (APS)$$d2014-02-05$$n6$$p064402$$tPhysical Review B$$v89$$x1098-0121$$y2014
000151434 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.89.064402$$gVol. 89, no. 6, p. 064402$$n6$$p064402$$tPhysical review / B$$v89$$x1098-0121$$y2014
000151434 8564_ $$yPublishers version according to licensing conditions.$$zPublished final document.
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