Correlation between static and dynamic magnetic properties of highly perpendicular magnetized C o49 P t51 thin films
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
92
Journal Issue
14
Date Issued
2015
Author(s)
Saravanan, P.
Hsu, J.-H.
Ch?rif, S.M.
Roussign?, Y.
Belmeguenai, M.
Stashkevich, A.
Vernier, N.
Singh, A.K.
Abstract
The static and dynamic magnetic behavior of 5-nm-thick Co49Pt51 films with strong perpendicular magnetic anisotropy (PMA) grown at different deposition temperatures (Td,CoPt) was investigated using complementary techniques such as vibrating sample magnetometry (VSM), magneto-optical Kerr effect (MOKE) imaging, and Brillouin light scattering (BLS). Our previous study on these films demonstrated the evolution of phase transformation from an A3-disordered (hexagonal) to an L11-ordered (rhombohedral) structure against increasing Td,CoPt from room temperature (RT) to 350°C. Along these lines, the changes in the domain configuration, magnetization reversal, and spin wave behavior of the 5-nm-thick CoPt films due to varying Td,CoPt are emphasized in this study. The VSM out-of-plane hysteresis loops confirmed the existence of strong PMA for all the CoPt films, irrespective of Td,CoPt. MOKE studies revealed that the films deposited at RT and at 150 C containing hard and soft magnetic areas, while the films grown at higher Td,CoPt, 250 and 350 C, are more uniform and homogeneous. The MOKE findings are validated by the BLS spectra in terms of high and low frequency lines corresponding to the hard and soft magnetic areas, respectively. A suitable model is hypothesized to interpret the frequency variation of BLS modes corresponding to the easy saturated regions of the CoPt films. By this means, a good correlation between both static and dynamic behavior of the 5-nm-thick CoPt films has been established in this study.
Type
journal article