Abstract
We investigate the in-plane magnetic anisotropy in La0.67Sr0.33MnO3 thin films grown on SrTiO3 (001) substrate using angular dependent room temperature Vectorial Magneto-Optical Kerr Magnetometry. The experimental data reveals that the magnetic anisotropy symmetry landscape significantly changes depending upon the strain and thickness. At low film thickness (12 and 25 nm) the dominant uniaxial anisotropy is due to interface effects, step edges due to mis-cut angle of SrTiO3 substrate. At intermediate thickness, the magnetic anisotropy presents a competition between magnetocrystalline (biaxial) and substrate step induced (uniaxial) anisotropy. Depending upon their relative strengths, a profound biaxial or uniaxial or mixed anisotropy is favoured. Above the critical thickness, magnetocrystalline anisotropy dominates all other effects and shows a biaxial anisotropy.
Highlights
La0.67Sr0.33MnO3 (LSMO) is considered to be a promising candidate for spintronic devices
The LSMO thin films were epitaxially grown on single crystal STO (001) substrates by pulsed laser deposition (PLD) technique
The structural, electrical and magnetic transport measurements were studied and the results are tabulated in table 1.Thickness and angular dependent in-plane magnetic anisotropy studies of LSMO thin films grown on STO (001) substrates were performed at room temperature by vectorial Magneto-Optical Kerr (v-MOKE) magnetometry in longitudinal geometry
Summary
La0.67Sr0.33MnO3 (LSMO) is considered to be a promising candidate for spintronic devices It exhibits nearly 100% spin polarization and room temperature ferromagnetism (Tc~370K). As STO (001) is cubic, the in-plane biaxial tensile strain induced into the film is isotropic and inducing four-fold magnetic anisotropy. Other studies reported that LSMO films can exhibit a uniaxial anisotropy and it is because of the steps transferred into film from the mis-cut. In addition to above studies, several authors artificially tuned uniaxial anisotropy of LSMO along the step edge direction by growing thin films on vicinal STO (001) substrates[3]. We report thickness and angular dependent magnetic anisotropy studies of strained epitaxial LSMO thin films of various thicknesses (50, 25 and 12 nm) epitaxially grown onto STO (001) substrates by pulsed laser deposition technique
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