Laalitha S. I. Liyanage, Sungho Kim, Yang Ki Hong, Ji-Hoon Park, Steven C. Erwin, Seong-Gon Kim
We study the site occupancy and magnetic properties of Zn-Sn substituted M-type Sr-hexaferrite SrFe$_{12-x}$(Zn$_{0.5}$Sn$_{0.5}$)$_x$O$_{19}$ with x = 1 using first-principles total-energy calculations. We find that in a ground-state configuration Zn-Sn ions preferentially occupy $4f_1$ and $4f_2$ sites unlike the model previously suggested by Ghasemi et al. [J. Appl. Phys, 107, 09A734 (2010)], where Zn-Sn ions occupy $2b$ and $4f_2$ sites. Our model predicts a rapid increase in saturation magnetic moment ($M_s$)as well as decrease in magnetic anisotropy compared to the pure M-type Sr-hexaferrite consistent with experimental observations.
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http://arxiv.org/abs/1209.5143
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