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• W2761585655 abstract "Magnetization of antiferromagnetic nanoparticles is known to generally scale up inversely to their diameter (d) according to Neel's model. Here we report a deviation from this conventional linear 1/d dependence, altered significantly by the microstrain, in Ca and Ti substituted BiFeO3 nanoparticles. Magnetic properties of microstrain-controlled Bi1−x Ca x Fe1−y Ti y O3−δ (y = 0 and x = y) nanoparticles are analyzed as a function of their size ranging from 18 nm to 200 nm. A complex interdependence of doping concentration (x or y), annealing temperature (T), microstrain (e) and particle size (d) is established. X-ray diffraction studies reveal a linear variation of microstrain with inverse particle size, 1/d nm−1 (i.e. e d = 16.5 nm%). A rapid increase in the saturation magnetization below a critical size d c ~ 35 nm, exhibiting a (1/d) α (α ≈ 2.6) dependence, is attributed to the influence of microstrain. We propose an empirical formula M (1/d)e β (β ≈ 1.6) to highlight the contributions from both the size and microstrain towards the total magnetization in the doped systems. The magnetization observed in nanoparticles is thus, a result of the competing magnetic contribution from the terminated spin cycloid on the surface and counteracting microstrain present at a given size." @default.
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• W2761585655 date "2017-10-24" @default.
• W2761585655 modified "2023-09-25" @default.
• W2761585655 title "Microstrain engineered magnetic properties in Bi_1−<i>x</i>Ca_<i>x</i>Fe_1−<i>y</i>Ti_<i>y</i>O_{3−<i>δ</i>}nanoparticles: deviation from Néel’s 1/<i>d</i>size-dependent magnetization behaviour" @default.
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• W2761585655 doi "https://doi.org/10.1088/2053-1591/aa9088" @default.
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