Magnetic Anisotropy in Thin Films of FePt Detected by the Ferromagnetic Resonance Method

Dmitriev, A., I; Kulikov, A., V; Gilmutdinov, I. F.; Dremova, N. N.; Mazitov, A. A.; Dmitrieva, M. S.; Alekseev, S., I; Myagkov, V. G. Source: JOURNAL OF SURFACE INVESTIGATION, 13 (2):210-214; 10.1134/S102745101902006X MAR 2019

FePt thin films are made via the heat treatment of structures containing Pt (001) and Fe (001) epitaxial layers. X-ray spectral analysis and field-emission scanning electron microscopy show that the samples contain the cubic L1₂–Fe₃Pt phase and the tetragonal L1₀–FePt phase. The magnetic anisotropy of the thin films is studied by ferromagnetic resonance and magnetometric methods. The contributions from the cubic and tetragonal phases to the ferromagnetic-resonance spectrum of the sample are distinguished. The key characteristics of thin films which determine their practical applicability are determined: the Gilbert damping parameter G ~ 0.4, the first and second crystal anisotropy constants K_1⊥ = –4.08 × 10⁶ erg/cm³, K_2⊥ = 1.34 × 10⁶ erg/cm³, K_2|| = –9.76 × 10⁴ erg/cm³.