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- Title
Extremely High Ferromagnetic Resonance Frequency Induced by Triclinic Lattice Distortion in Epitaxial FeCo/MgAl<sub>2</sub>O<sub>4</sub> (001) Films.
- Authors
Ding, Congying; Wang, Le; Islam, Rabiul; Zhang, Shouheng; Wang, Xia; Li, Hongli; He, Wa; Zhu, Xingqi; Yao, Zhao; Jin, Zhejun; Zhao, Guoxia; Peng, Yong; Miao, Guo-Xing; Li, Shandong
- Abstract
Theoretically, tetragonal lattice distortion of FeCo epitaxial films can result in a very large in‐plane magnetic anisotropy field, leading to an extremely high ferromagnetic resonance (FMR) frequency. Herein, Fe75Co25$\left(\text{Fe}\right)_{75} \left(\text{Co}\right)_{25}$ thin films are epitaxially grown on (001) MgAl2O4 single‐crystal substrates. A triclinic lattice distortion with a≠b≠c$a \neq b \neq c$, instead of a tetragonal one, is found in the FeCo films. The cubic symmetry breaking leads to a deviation of easy axes from the 100$100$ directions, forming a distribution of magnetic moments with a strong perpendicular magnetic anisotropy (PMA) along the out‐of‐plane [001] directions and a deviation of the in‐plane components from the ([10 100]) directions. The effective field of the former is as high as 1.5–2.5 T, enough to overcome the thin film shape anisotropy, while that of the latter stays at a low value of around 0.05 T. The strain‐induced PMA gradually relaxes to in‐plane for thicker films with a strained sublayer remaining. As a result, an extremely high out‐of‐plane FMR frequency over 40 GHz is achieved, accompanied by a lower in‐plane FMR frequency around 8 GHz. This study provides a possible approach to prepare self‐biased soft magnetic films with extremely high‐resonance frequency for applications in microwave‐integrated circuits.
- Subjects
FERROMAGNETIC resonance; PERPENDICULAR magnetic anisotropy; MAGNETIC moments; THIN films; MAGNETIC anisotropy; METAL-insulator transitions; EPITAXY; MAGNETIC films
- Publication
Physica Status Solidi. A: Applications & Materials Science, 2023, Vol 220, Issue 18, p1
- ISSN
1862-6300
- Publication type
Article
- DOI
10.1002/pssa.202300438