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001005345 0247_ $$2doi$$a10.1021/acs.chemmater.2c02813
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001005345 1001_ $$00000-0001-9417-6514$$aZákutná, Dominika$$b0
001005345 245__ $$aMagnetic Coupling in Cobalt-Doped Iron Oxide Core–Shell Nanoparticles: Exchange Pinning through Epitaxial Alignment
001005345 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2023
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001005345 520__ $$aTuning the core–shell morphology of bimagnetic nanoparticles and its associated exchange bias behavior is a promising way to overcome the superparamagnetic limit and stabilize the particle moment in extended time and temperature ranges. The intraparticle magnetization distribution and magnetic coupling between the two phases, however, is still unclear. We report a significant nonzero magnetization in the CoxFe(1–x)O core of native core–shell bimagnetic nanoparticles that is typically considered antiferro- or paramagnetic. Co0.14Fe0.86O@Co0.4Fe2.4O4 (6 nm@2 nm) and Co0.08Fe0.92O@Co0.58Fe2.28O4 (12 nm@2 nm) core–shell nanoparticles have been synthesized by thermal decomposition of a mixed cobalt–iron oleate with a similar Fe/Co distribution throughout the nanoparticle. We determine the exact phase composition and the magnetization distribution in the core and shell using a combination of X-ray and neutron small-angle scattering. Core and shell magnetization are traced separately with a varying magnetic field. Our results reveal that the magnetization of the core and the spinel-type shell phases are coupled at room temperature, i.e., rotating coherently with the magnetic field. This is a mandatory condition to observe a significant exchange bias effect at low temperatures. These findings highlight the enormous potential of finite size and exchange coupling in bimagnetic nanoparticles to control the magnetic properties via interface-induced magnetization.
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001005345 7001_ $$0P:(DE-HGF)0$$aRouzbeh, Nahal$$b1
001005345 7001_ $$0P:(DE-HGF)0$$aNižňanský, Daniel$$b2
001005345 7001_ $$0P:(DE-HGF)0$$aDuchoň, Jan$$b3
001005345 7001_ $$0P:(DE-Juel1)187095$$aQdemat, Asmaa$$b4
001005345 7001_ $$0P:(DE-Juel1)130754$$aKentzinger, Emmanuel$$b5
001005345 7001_ $$00000-0003-0763-982X$$aHonecker, Dirk$$b6
001005345 7001_ $$00000-0002-4565-189X$$aDisch, Sabrina$$b7$$eCorresponding author
001005345 773__ $$0PERI:(DE-600)1500399-1$$a10.1021/acs.chemmater.2c02813$$gp. acs.chemmater.2c02813$$n6$$p2302-2311$$tChemistry of materials$$v35$$x0897-4756$$y2023
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001005345 8564_ $$uhttps://juser.fz-juelich.de/record/1005345/files/SANSPOL_core_shell_MNP.pdf$$yPublished on 2023-03-09. Available in OpenAccess from 2024-03-09.
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