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Spintronics exploits the magnetoresistance effects to store or sense themagnetic information. Since the magnetoresistance strictly depends on themagnetic anisotropy of the system, it is fundamental to set a definedanisotropy to the system. Here, we investigate by means of vectorialMagneto-Optical Kerr Magnetometry (v-MOKE), half-metallic La0.67Sr0.33MnO3(LSMO) thin films that exhibit at room temperature pure biaxial magneticanisotropy if grown onto MgO (001) substrate with a thin SrTiO3 (STO) buffer.In this way, we can avoid unwanted uniaxial magnetic anisotropy contributionsthat may be detrimental for specific applications. The detailed study of theangular evolution of the magnetization reversal pathways, critical fields(coercivity and switching) allows for disclosing the origin of the magneticanisotropy, which is magnetocrystalline in nature and shows four-fold symmetryat any temperature.

Room temperature biaxial magnetic anisotropy in La0.67Sr0.33MnO3 thin films on SrTiO3 buffered MgO (001) substrates for spintronic applications