Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2016

Идентификатор DOI: 10.1016/j.jmmm.2015.10.041

Ключевые слова: Crystallites, Exchange interactions, Magnetic anisotropy, Magnetization, Porous materials, Saturation magnetization, Spin waves, Exchange constants, Exchange interaction effects, Fractal dimensionality, Magnetic anisotropy energy, Magnetization curves, Nanostructured particles, Saturation curve, Thermal spin waves, Nanocrystalline alloys

Аннотация: 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 spongelike agglomerates of crystallites is estimated as A = (7 +/- 1) pJ/m from the approach magnetization to saturation curves that is in good agreement with A = (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 H-c similar to 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. (C) 2015 Elsevier B.V. All rights reserved.

Журнал: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Выпуск журнала: Vol. 401

Номера страниц: 236-241

ISSN журнала: 03048853

Место издания: AMSTERDAM

Издатель: ELSEVIER SCIENCE BV

• Komogortsev S.V. (Kirensky Institute of Physics, SB RAS)
• Iskhakov R.S. (Kirensky Institute of Physics, SB RAS)
• Yurkin G.Y. (Kirensky Institute of Physics, SB RAS)
• Eremin E.V. (Kirensky Institute of Physics, SB RAS)
• Filatov E.Y. (Novosibirsk State University)
• Korenev S.V. (Novosibirsk State University)
• Shubin Y.V. (Novosibirsk State University)
• Zimin A.A. (Siberian Federal University)
• Chizhik N.A. (Siberian Federal University)

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