Splitting phenomenon of ferromagnetic resonance spectra in NiFe films deposited on periodically rippled sapphire substrates

Xu Xu; Lei Zheng; Lichuan Jin; Tianlong Wen; Yulong Liao; Xiaoli Tang; Yuanxun Li; Zhiyong Zhong

doi:10.1088/1361-648X/ad08e9

Splitting phenomenon of ferromagnetic resonance spectra in NiFe films deposited on periodically rippled sapphire substrates

J Phys Condens Matter. 2023 Nov 21;36(8). doi: 10.1088/1361-648X/ad08e9.

Authors

Xu Xu¹, Lei Zheng¹, Lichuan Jin¹, Tianlong Wen¹, Yulong Liao¹, Xiaoli Tang¹, Yuanxun Li¹, Zhiyong Zhong¹

Affiliation

¹ State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, People's Republic of China.

PMID: 37918010
DOI: 10.1088/1361-648X/ad08e9

Abstract

The splitting phenomenon of ferromagnetic resonance (FMR) spectra of Ni₈₀Fe₂₀(NiFe) films deposited on periodically rippled sapphire substrates is studied experimentally with the help of micromagnetic simulation. The analyses show that the splitting of FMR spectra is related to the periodic ripple topography of films. When the applied magnetic field is perpendicular to the ripple direction, the effective field of periodically rippled films becomes inhomogeneous. The splitting of FMR spectra originates from localized FMR peaks corresponding to different regions with different effective field intensities in the rippled structure. Furthermore, the relative intensity and position between the split mode and the main FMR mode can be changed by designing ripple topography. This work would help understand the splitting phenomenon of FMR spectra for magnetic thin films deposited on the periodically rippled sapphire substrates.

Keywords: ferromagnetic resonance; magnetic anisotropy; magnetic thin films; micromagnetic simulation; periodically rippled substrates.