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Thin garnet films are becoming central for magnon-spintronics andspin-orbitronics devices as they show versatile magnetic properties togetherwith low magnetic losses. These fields would benefit from materials in whichheat does not affect the magnetization dynamics, an effect known as thenon-linear thermal frequency shift. In this study, low damping Bi substitutedIron garnet (Bi:YIG) ultra-thin films have been grown using Pulsed LaserDeposition. Through a fine tuning of the growth parameters, the precise controlof the perpendicular magnetic anisotropy allows to achieve a full compensationof the dipolar magnetic anisotropy. Strikingly, once the growth conditions areoptimized, varying the growth temperature from 405 {\deg}C to 475 {\deg}C asthe only tuning parameter induces the easy-axis to go from out-of-plane toin-plane. For films that are close to the dipolar compensation, FerromagneticResonance measurements yield an effective magnetization $\mu _{0}M_{eff} (T)$that has almost no temperature dependence over a large temperature range (260 Kto 400 K) resulting in an anisotropy temperature exponent of 2. These findingsput Bi:YIG system among the very few materials in which the temperaturedependence of the magnetic anisotropy varies at the same rate than thesaturation magnetization. This interesting behavior is ascribedphenomenologically to the sizable orbital moment of $Bi^{3+}$.

Temperature-independent ferromagnetic resonance shift in Bi-doped YIG garnets through magnetic anisotropy tuning