Abstract
Epitaxial La2/3Sr1/3MnO3 thin films with different crystallographic orientations were fabricated on (001)-, (110)-, and (111)-oriented SrTiO3 substrates by pulsed laser deposition. Out-of-plane magnetic anisotropy was studied with the field angle fixed at 0°, 30°, 60°, and 90° relative to the film surface. The results show that there is a remarkable dependence of the magnetization on the magnetic field direction and crystallographic orientation. Furthermore, the (110)- and (111)-oriented thin films show stronger angular-dependent magnetic anisotropy than the (001) film, and the (110)-oriented one can reach the saturated magnetization more easily than the other two films. Such findings are correlated with the strain imposed on the films via substrates with different orientations. Our results have implications for the better understanding of magnetic anisotropy and the tunability of the magnetoelectric coupling coefficient involving multiferroic composite thin films.
Highlights
Epitaxial LSMO thin films with different crystallographic orientations used in this study were fabricated by pulsed laser deposition with a 248 nm KrF excimer laser on (001), (110), and
The crystallinity and crystallographic orientations of the films were characterized by highresolution X-ray diffraction (XRD) using a Bruker D8 Discover four-circle diffraction system (CuKα1, λ=1.5406 Å) and transmission electron microscopy (TEM, Tecnai G20)
That the position of the diffraction peaks of the three oriented LSMO thin films are in good agreement with the corresponding substrates, which reveals that the epitaxial relationships of the (001), (110), and (111) thin films are LSMO(001)[010]||STO(001)[010], LSMO(110)[001]||STO(110)[001], and LSMO(111)[001]||STO(111)[001], respectively
Summary
Perovskite manganite La2/3Sr1/3MnO3 (denoted LSMO hereafter), which has coupling between spin, orbital, lattice, and charge degrees of freedom,[1] is one of the most promising strongly correlated electron oxides and has been studied intensively during the past several decades because of its interesting physical mechanisms and applications.[2,3] Considering most applications are in the form of thin film devices, magnetic anisotropy is an important character parameter for perovskite manganite films because it affects behaviors such as the magnetization curve, domain structure and coercivity.[4,5,6] Different from bulk manganites, magnetic anisotropy in thin films can be significant.[7,8,9,10,11] In addition to the intrinsic magnetocrystalline anisotropy, the epitaxial strain induced by the substrate,[10,12] lattice distortions and defects near interfaces,[13] and geometric anisotropy will affect the magnetic properties of the film. It has been reported that a compressively strained film will exhibit an out-of-plane spin alignment, while a film with a tensile strain favors an in-plane magnetization for LSMO thin film.[14]. Films with different orientations possess various anisotropic magnetic and transport properties.[9]
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