Inverted surface hysteresis loops in heterogeneous (nanocrystalline/amorphous) Fe81Nb7B12 alloys |
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| Authors: | E. E. Shalyguina I. Škorvánek P. Švec V. V. Molokanov V. A. Mel’nikov |
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| Affiliation: | (1) Moscow State University, Moscow, 119899, Russia;(2) Institute of Experimental Physics, Slovakian Academy of Sciences, SK-043 53 Košice, Slovakia;(3) Institute of Physics, Slovakian Academy of Sciences, SK-842 28 Bratislava, Slovakia;(4) Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, 117334, Russia |
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| Abstract: | Inverted hysteresis loops were observed for the first time in the near-surface layers of heterogeneous (nanocrystalline/amorphous) Fe81Nb7B12 alloys. In particular, a negative residual magnetization is retained when a positive magnetic field applied in the sample plane is decreased to zero. The inverted hysteresis is qualitatively explained within the framework of a two-phase model, according to which the heterogeneous alloys contain two dissimilar phases exhibiting uniaxial magnetic anisotropy and featuring antiferromagnetic exchange interaction. |
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