The interface-driven spin-orbit coupling (SOC) mechanism in the oxide-based two-dimensional electron gas (2DEG) system can be very crucial to tune the magnetization dynamics. We have deposited ${\mathrm{LaTiO}}_3\left(\mathrm{LTO}\right)$ layer with varying thickness $\delta$ at the interface of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_3$ $(15 \mathrm{nm})/{\mathrm{SrTiO}}_3\left(001\right)$ [LSMO (15 nm)/STO(001)] thin film heterostructures. Through systematic and comprehensive ferromagnetic resonance (FMR) measurements, we observed changes in the effective magnetization, Gilbert damping, and magnetic anisotropy of the ferromagnetic LSMO layer on the increasing thickness of the interfacial LTO layer. The introduction of LTO layer at the LSMO/STO interface gives rise to an increase in effective magnetic field and in-plane magnetic anisotropy. We argue this is due to the enhanced Rashba effect at the LTO/STO interface. Furthermore, the polar angle variation of the FMR linewidth reveals the effect of induced Rashba field and magnetic inhomogeneity on the local variation of $4\pi M_{\mathrm{eff}}$ at the interface. Our study reveals tunable magnetization dynamics of LSMO with Rashba SOC and 2DEG resulting from varying the thickness of the LTO layer. This can be very promising to unlock novel functionalities in advanced nanoscale electronics and spintronics applications.

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• Magnetic anisotropy
• Magnetism
• Magnetization dynamics
• Spin dynamics
• Spintronics
• Heterostructures
• Magnetic thin films
• Ferromagnetic resonance
• Landau-Lifschitz-Gilbert equation