This article is cited in 7 papers

Magnetism

Relaxation of the state with induced transverse magnetic anisotropy in the soft magnetic nanocrystalline alloy Fe$_{73.5}$Si$_{13.5}$Nb$_3$B$_9$Cu$_1$

N. V. Ershov^a, N. V. Dmitrieva^a, Yu. P. Chernenkov^b, V. A. Lukshina^a, V. I. Fedorov^b, A. P. Potapov<sup>a

a</sup> Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
^b The Petersburg Nuclear Physics Institute, The National Research Center "Kurchatov Institute"

Abstract: The residual lattice strains of nanocrystals, which are responsible for the formation of states with transverse magnetic anisotropy in samples of the Fe–Si–Nb–B–Cu alloys (Finemets) subjected to annealing under tensile loading with the subsequent relaxation annealing at temperatures in the range from 500 to 600$^\circ$C, have been measured using X-ray diffraction. The relative extension and compression of interplanar spacings have been compared with the induced magnetic anisotropy constants determined from the magnetic hysteresis loops. It has been shown that, during the relaxation annealing at the nanocrystallization temperature (500–540$^\circ$C), the observed decrease in the residual strains is accompanied by a decrease in the transverse magnetic anisotropy constant. A linear correlation between the relative extension and compression of the interplanar spacings for different crystallographic planes and magnetic anisotropy constant has been revealed. The deviation from linearity is observed after annealing at a temperature of 600$^\circ$C, which is explained by a possible increase in sizes of nanocrystals, changes in their structure, and partial crystallization of the amorphous matrix.

Received: 01.03.2012

 English version: Physics of the Solid State, 2012, 54:9, 1817–1826

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