Intercrystallite magnetic interactions and properties of nanostructured magnetic materials (review)

Shadrov, V. G.; Nemtsevich, L. V.

doi:10.1134/s2075113312010108

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2016

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“…These methods are suitable for the weak interparticle ineractions case. However, they are sometimes used to estimate the interactions between crystallites in the polycrystalline media [25,28,29]. The measurement of the Curie temperature in the intergranular phase of two-phase material is also used for evaluation of the intergranular exchange [30].…”

Section: Introductionmentioning

confidence: 99%

The exchange interaction effects on magnetic properties of the nanostructured CoPt particles

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Zimin

et al. 2016

Journal of Magnetism and Magnetic Materials

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Various manifestations of the exchange interaction effects in magnetization curves of the CoPt nanostructured particles are demonstrated and discussed. The inter-grain exchange constant A in the sponge-like agglomerates of crystallites is estimated as А = (7 ± 1) pJ/m from the approach magnetization to saturation curves that is in good agreement with А = (6.6 ± 0.5) pJ/m obtained from Bloch T 3/2 law. The fractal dimensionality of the exchange coupled crystallite system in the porous media of the disordered CoPt alloy d = (2.60 ± 0.18) was estimated from the approach magnetization to saturation curve. Coercive force decreases with temperature as Hc ~ T 3/2 which is assumed to be a consequence of the magnetic anisotropy energy reduction due to the thermal spin wave excitations in the investigated CoPt particles.

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