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000904911 1001_ $$0P:(DE-HGF)0$$aGross, B.$$b0
000904911 245__ $$aMagnetic anisotropy of individual maghemite mesocrystals
000904911 260__ $$aWoodbury, NY$$bInst.$$c2021
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000904911 520__ $$aInterest in creating magnetic metamaterials has led to methods for growing superstructures of magnetic nanoparticles. Mesoscopic crystals of maghemite (γ-Fe2O3) nanoparticles can be arranged into highly ordered body-centered tetragonal lattices of up to a few micrometers. Although measurements on disordered ensembles have been carried out, determining the magnetic properties of individual mesoscopic crystals is challenging due to their small total magnetic moment. Here, we overcome these challenges by utilizing sensitive dynamic cantilever magnetometry to study individual micrometer-sized γ-Fe2O3 mesocrystals. These measurements reveal an unambiguous cubic anisotropy, resulting from the crystalline anisotropy of the constituent maghemite nanoparticles and their alignment within the mesoscopic lattice. The signatures of anisotropy and its origins come to light because we combine the self-assembly of highly ordered mesocrystals with the ability to resolve their individual magnetism. This combination is promising for future studies of the magnetic anisotropy of other nanoparticles, which are too small to investigate individually.
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000904911 7001_ $$0P:(DE-HGF)0$$aPhilipp, S.$$b1
000904911 7001_ $$0P:(DE-Juel1)165357$$aJosten, E.$$b2$$eCorresponding author
000904911 7001_ $$00000-0001-8778-3092$$aLeliaert, J.$$b3$$eCorresponding author
000904911 7001_ $$0P:(DE-HGF)0$$aWetterskog, E.$$b4
000904911 7001_ $$0P:(DE-HGF)0$$aBergström, L.$$b5
000904911 7001_ $$00000-0002-5327-051X$$aPoggio, M.$$b6$$eCorresponding author
000904911 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.103.014402$$gVol. 103, no. 1, p. 014402$$n1$$p014402$$tPhysical review / B$$v103$$x1098-0121$$y2021
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