| Autor: |
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 |
| Předmět: |
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| Zdroj: |
Physica Status Solidi. A: Applications & Materials Science; Sep2023, Vol. 220 Issue 18, p1-7, 7p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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