The van der Waals material ${\mathrm{Fe}}_3{\mathrm{Ga}\mathrm{Te}}_2$ (F3GaT) is a promising candidate for spintronic applications due to its high Curie temperature ($T_C$) and strong perpendicular magnetic anisotropy (PMA). In this study, we thoroughly investigate the spin dynamics of F3GaT single crystals using electron spin resonance (ESR) techniques. The temperature-dependent ESR spectra reveal a significant range of magnetic fluctuations from $T_C\sim 362$ K to $T^{\ast }\sim 410$ K. Furthermore, the angle-dependent resonance field $H_r$ of the ESR demonstrates strong PMA, with the maximum $H_r$ in the $ab$ plane indicating the hard direction, while the minimum along the $c$ axis suggesting the easy orientation. Meanwhile, the angle-dependent ESR spectra reveal distinct anisotropic spin couplings. For $H//ab$, spin-spin relaxation predominates between $T_C$ and $T^{\ast }$, whereas spin-lattice relaxation prevails above $T^{\ast }$. In contrast, for $H//c$, the Korringa mechanism, arising from the interaction between localized spins and conduction electrons, dominates above $T_C$. Our findings elucidate the anisotropic spin dynamics in F3GaT, providing insights into its potential application in microwave-based spintronic devices.

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• Magnetic anisotropy
• Magnetic coupling
• Magnetic phase transitions
• Spin dynamics
• Spintronics
• Ferromagnets
• van der Waals systems
• Electron paramagnetic resonance