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Magneto-optical properties of La 0 . 7 Sr 0 . 3 MnO 3 thin films with perpendicular magnetic anisotropy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Liu, Hsiang Lin Lu, Kai Sheng Kuo, Melissa X. |
| Copyright Year | 2006 |
| Abstract | We report the magneto-optical MO properties of compressively strained La0.7Sr0.3MnO3 LSMO thin films epitaxially grown on a LaAlO3 substrate. The magnetic force microscope images show the stripe magnetic domains, characteristic of films with the perpendicular magnetic anisotropy PMA . The optical reflectance and transmittance of the samples were measured over a broad energy range from the far infrared through the ultraviolet. To extract the optical constants of the films, we analyzed all of the layers of this thin-film structure using a Drude-Lorentz model. From the parameters obtained, we compute the optical constants, such as frequency-dependent optical conductivity and the diagonal components of the dielectric tensor. Moreover, the MO polar Kerr spectra of the samples were measured in an applied magnetic field of 1.5 T between 0.74 and 5.8 eV. The off-diagonal components of the dielectric tensor were then calculated by analyzing Kerr rotation, ellipticity, and the determined diagonal elements of the dielectric tensor. These functions yield information about the spin-dependent electronic structures of the LSMO thin films. We observed several MO-active transitions above 2 eV. These bands arise from the Mn-d t2g to Mn-d eg in the majority-spin channel and the onset of O-2p to Mn-d eg and O-2p to Mn-d t2g transitions in the minority-spin channel, in accord with the band-structure calculations. Most interestingly, their peak position and intensity are dependent on the film thickness, suggesting possible applications for tailoring MO responses in these PMA thin films. © 2006 American Institute of Physics. DOI: 10.1063/1.2173681 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.phys.nthu.edu.tw/~jeng/paper/06/JApplPhys_99_043908.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
