Magneto-optical properties of chromium-alloyed manganese bismuth thin films
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چکیده
MnBi thin films have been considered for short-wavelength rewritable optical recording media due to the very large magneto-optic Kerr rotation and perpendicular anisotropy (Ku) of the hexagonal magnetic low-temperature MnBi phase. However, coincident structural and magnetic transformations near the Curie temperature ~360 °C! result in poor thermal cycling behavior, preventing the application of MnBi as rewritable media. We have previously hypothesized that the substitution of Cr for Mn would reduce the ferromagnetic coupling along the c axis, thereby lowering the Curie temperature and possibly decoupling the magnetic and structural transitions. Preliminary experimental data reported earlier @P. R. Bandaru et al., Appl. Phys. Lett. 72, 2337 ~1998!# supported this hypothesis. In this article, the effects of Cr substitution are further explored and the feasibility of Mn12xCrxBi (0,x,0.15) films for magneto-optical recording applications analyzed. It is shown that 5% Cr is sufficient for decoupling the phase transitions with no significant loss in the magneto-optic figure of merit. Transmission electron microscopy studies indicate a small grain size ~;50 nm! for the Cr-alloyed films, which could be beneficial for reducing media noise. © 1999 American Institute of Physics. @S0021-8979~99!04515-6#
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تاریخ انتشار 1999