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• W2028542021 endingPage "325002" @default.
• W2028542021 startingPage "325002" @default.
• W2028542021 abstract "Magnetic interfaces created by the formation of a nanocomposite of ferromagnetic BiFeO3 nanoparticles of mean size 11 nm and antiferromagnetic network-like nanostructured NiO are studied. The effective radius of the ferromagnetic region is smaller than the actual nanoparticle size, thus confirming the involvement of a large fraction of surface spins in the interfacial magnetism. The exchange coupling between the BiFeO3 nanoparticles and the network-like nanostructured NiO leads to an interfacial blocking phase having an average blocking temperature of about 80 K. The temperature dependent saturation magnetization follows the Bloch law at high (150–300 K) temperature and exponential behaviour in intermediate (25–150 K) and low (5–25 K) temperature regimes. Exchange bias appears below the irreversible temperature of about 300 K, well below the Neel temperature of NiO. The composition dependences of the exchange bias field (HEB) and the coercivity (HC) reveal maximum values of HEB = 1550 Oe and HC = 1730 Oe at 5 K and a cooling field of 50 kOe for a BiFeO3 : NiO :: 50 : 50 concentration ratio. The exchange bias field decreases exponentially with increase of the temperature. Strong interfacial coupling due to uncompensated surface spins leads to a remarkable enhancement of the magnetic anisotropy at the BiFeO3/NiO interface." @default.
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• W2028542021 date "2014-07-18" @default.
• W2028542021 modified "2023-10-16" @default.
• W2028542021 title "Large magnetic exchange anisotropy at a heterointerface composed of nanostructured BiFeO3and NiO" @default.
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• W2028542021 doi "https://doi.org/10.1088/0022-3727/47/32/325002" @default.
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