Abstract:
The structure and magnetic properties of amorphous and nanocrystalline Co$_{56}$Fe$_{16}$B$_{20}X_8$ ($X$ = Nb, Ti) alloys have been studied by X-ray diffraction and vibrating sample magnetometry. It is shown that the saturation magnetization of the amorphous Co$_{56}$Fe$_{16}$B$_{20}$Ti$_8$ alloy is higher than that of the Co$_{56}$Fe$_{16}$B$_{20}$Nb$_8$ alloy. The temperature dependence of the saturation magnetization of amorphous alloys is measured and it is shown that the saturation magnetization of the Co$_{56}$Fe$_{16}$B$_{20}$Ti$_8$ alloy decreases with temperature more slowly than the magnetization of the Co$_{56}$Fe$_{16}$B$_{20}$Nb$_8$ alloy. Crystallization of amorphous alloys leads to a decrease in the saturation magnetization of both alloys. During crystallization, BCC nanocrystals are formed in the Co$_{56}$Fe$_{16}$B$_{20}$Nb$_8$ alloy and multiphase structure is formed in the Co$_{56}$Fe$_{16}$B$_{20}$Ti$_8$ alloy.
Keywords:amorphous phase, crystallization, nanocrystals, magnetic properties.
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