Magnetic Anisotropy of [.sub.100 - .sub.x/Bi.sub.2Te.sub.3].sub.47 Multilayer Heterostructures

Magnetic anisotropy values are obtained for [(Co.sub.41Fe.sub.39B.sub.20).sub.x(SiO.sub.2).sub.100 - .sub.x/Bi.sub.2Te.sub.3].sub.47 heterostructures consisting of SiO.sub.2 alternating layers, CoFeB nanoparticles distributed in them, and Bi.sub.2Te.sub.3 layers with ferromagnetic resonance and magn...

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Bibliographic Details
Published in:Physics of the solid state 2019-02, Vol.61 (2), p.127
Main Authors: Bezverkhnii, A. I, Talantsev, A. D, Kalinin, Yu. E, Sitnikov, A. V, Nikitenko, V. A, Koplak, O. V, Dmitriev, O. S
Format: Article
Language:English
Subjects:
Anisotropy
Ferromagnetism
Magnetization
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Summary:Magnetic anisotropy values are obtained for [(Co.sub.41Fe.sub.39B.sub.20).sub.x(SiO.sub.2).sub.100 - .sub.x/Bi.sub.2Te.sub.3].sub.47 heterostructures consisting of SiO.sub.2 alternating layers, CoFeB nanoparticles distributed in them, and Bi.sub.2Te.sub.3 layers with ferromagnetic resonance and magnetometry. The heterostructures have anisotropy of ~10.sup.6 erg/cm.sup.3, which orients the magnetic moment in films plane. The films are not solid, but they disintegrate into CoFeB nanoparticles with an average diameter of 5 nm during deposition, which corresponds to the blocking magnetization temperature of ~30 K during their saturation magnetization of M.sub.S = 720 emu/cm.sup.3. The relationship between anisotropy constant and thickness of the layers of the heterostructures is nonmonotonic due to competition between surface and bulk anisotropies of the ferromagnetic granules, which the films are made of.
ISSN:1063-7834
DOI:10.1134/S1063783419020070