[15p-P07-1~60] 10 Spintronics and Magnetics (Poster)

[15p-P07-1] Substrate orientation dependence of anomalous FMR linewidth in Fe thin films

〇(D)Seungkeun Baek¹, Touma Izumi¹, Sachio Komori¹, Keiichiro Imura², Tomoyasu Taniyama¹ (1.Nagoya Univ., 2.ILAS, Nagoya Univ.)

Keywords:

Ferromagnetic resonance,Gilbert damping constant

Gilbert damping constant α is determined by the linear relationship between the ferromagnetic resonance (FMR) linewidth ΔH and the resonant frequency f. However, since ΔH includes contributions other than ΔH_int, so it is often difficult to accurately calculate α. In this study, Fe thin films were grown on MgO(100) and MgO(111) substrates, and anomalous (nonlinear) magnetic field orientation dependence of α is observed on MgO(111). We suggest that the inhomogeneity induced by the large lattice misfit between Fe and substrates provides contributions other than ΔH_int, resulting in the anomalous f dependence of ΔH.