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The suitability of a particular material for use in magnetic devices isdetermined by the process of magnetization reversal/relaxation, which in turndepends on the magnetic anisotropy. Therefore, designing new ways to controlmagnetic anisotropy in technologically important materials is highly desirable.Here we show that magnetic anisotropy of epitaxial thin-films of half-metallicferromagnet La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ (LSMO) is determined by the proximityto thermodynamic equilibrium conditions during growth. We performed a series ofX-ray diffraction and ferromagnetic resonance (FMR) experiments in twodifferent sets of samples: the first corresponds to LSMO thin-films depositedunder tensile strain on (001) SrTiO$_{3}$ by Pulsed Laser Deposition (PLD; farfrom thermodynamic equilibrium); the second were deposited by a slow ChemicalSolution Deposition (CSD) method, under quasi-equilibrium conditions. Thinfilms prepared by PLD show a in-plane cubic anisotropy with an overimposeduniaxial term. A large anisotropy constant perpendicular to the film plane wasalso observed in these films. However, the uniaxial anisotropy is completelysuppressed in the CSD films. The out of plane anisotropy is also reduced,resulting in a much stronger in plane cubic anisotropy in the chemicallysynthesized films. This change is due to a different rotation pattern ofMnO$_{6}$ octahedra to accomodate epitaxial strain, which depends not only onthe amount of tensile stress imposed by the STO substrate, but also on thegrowth conditions. Our results demonstrate that the nature and magnitude of themagnetic anisotropy in LSMO can be tuned by the thermodynamic parameters duringthin-film deposition.

Thermodynamic conditions during growth determine the magnetic anisotropy in epitaxial thin-films of La$_{0.7}$Sr$_{0.3}$MnO$_{3}$