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• W984668826 abstract "Among all bi-magnetic core(transition metal)@shell(transition metal oxide) nanoparticles (NPs), [email protected] ones show an onset temperature for the exchange bias (EB) effect far below the Néel temperature of bulk antiferromagnetic NiO. In this framework, the role played by the magnetism of NiO at the nanoscale is investigated by comparing the microstructure and magnetic properties of NiO and [email protected] NPs. With the aim of bridging the two systems, the diameter of the NiO NPs (~4 nm) is chosen to be comparable to the shell thickness of [email protected] ones (~2 nm). The EB effect in [email protected] NPs is attributed to the exchange coupling between the core and the shell, with an interfacial exchange energy of ΔE~0.06 erg cm−2, thus comparable to previous reports on Ni/NiO interfaces both in thin film and NP morphologies. In contrast, the EB detected in NiO NPs is explained in a picture where uncompensated spins located on a magnetically disordered surface shell are exchange coupled to the antiferromagnetic core. In all the studied NPs, the variation of the EB field as a function of temperature is described according to a negative exponential law with a similar decay constant, yielding a vanishing EB effect around T~40–50 K. In addition, the onset temperature for the EB effect in both NiO and [email protected] NPs seems to follow a universal dependence with the NiO crystallite size." @default.
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• W984668826 date "2016-02-01" @default.
• W984668826 modified "2023-10-01" @default.
• W984668826 title "Bridging exchange bias effect in NiO and Ni(core)@NiO(shell) nanoparticles" @default.
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• W984668826 doi "https://doi.org/10.1016/j.jmmm.2015.07.060" @default.
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