Engineering spin wave spectra in thick Ni80Fe20 rings by using competition between exchange and dipolar fields

• Type: Another Publication in an International Scientific Journal
• Date: 2021

Authors

Zhou, X (Author) Other; Tartakovskaya, EV (Author) Other; G.N. Kakazei (Author) FCUP; Adeyeye, AO (Author) Other

Journal

Title: Physical Review B

Vol. 104

ISSN: 2469-9950

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 3 Citations

Other information

Authenticus ID: P-00V-RM8

DOI: 10.1103/physrevb.104.214402

Abstract (EN): Control of the spin wave dynamics in nanomagnetic elements is very important for the realization of a broad range of novel magnonic devices. Here we study experimentally the spin wave resonance in thick ferromagnetic rings (100 nm) using perpendicular ferromagnetic resonance spectroscopy. Different from what was observed for the continuous film of the same thickness, or from rings with similar lateral dimensions but with lower thicknesses, the spectra of thick patterned rings show a nonmonotonic dependence of the mode intensity on the resonance field for a fixed frequency. To explain this effect, the theoretical approach by considering the dependence of the mode profiles on both the radial and axial coordinates was developed. It was demonstrated that such unusual behavior is a result of the competition between exchange and dipolar fields acting at the spin excitations in the structure under study. The calculations are in a good agreement with the experimental results.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9