Magnetization dynamics in single and trilayer nanowires.

Kuchibhotla, Mahathi; Haldar, Arabinda; Adeyeye, Adekunle Olusola

Abstract

We have studied the magnetization dynamics of single Py( ) ( = 20 nm, 50 nm) and trilayer [Py(50)/Pd( )/Py(20)] nanowire arrays fabricated over large areas using deep ultraviolet lithography technique. The dynamic properties are sensitive to the field orientation and magnetic film thicknesses. A single resonant mode corresponding to the excitations at the bulk part of the wire is detected in all the single-layer nanowire arrays. Furthermore, the spacer layer thickness influenced the dynamic properties in trilayer samples due to the different coupling mechanisms. A single resonant mode is observed in = 2 nm trilayer nanowires with a sharp frequency jump from 13 GHz to 15 GHz across the reversal regime. This indicates the exchange coupling and the coherence in magnetization precession in the ferromagnetic layers. On the other hand, wires with 10 nm-spacer display two well-resolved modes separated by ∼3 GHz with a gradual change in frequency across the reversal regime from-26mT to-46mT, indicating the presence of long-range dipolar interactions instead of exchange coupling. The spacer layer of the proposed spin-valve-type structure can be tailored for desired microwave splitters or combiners. [Abstract copyright: © 2024 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.]

Citation

Kuchibhotla, M., Haldar, A., & Adeyeye, A. O. (2024). Magnetization dynamics in single and trilayer nanowires. Journal of Physics: Condensed Matter, 36(45), Article 455808. https://doi.org/10.1088/1361-648X/ad6c9a

• Journal Article Type: Article
• Acceptance Date: Aug 7, 2024
• Online Publication Date: Aug 14, 2024
• Publication Date: Nov 13, 2024
• Deposit Date: Aug 30, 2024
• Journal: Journal of Physics: Condensed Matter
• Print ISSN: 0953-8984
• Electronic ISSN: 1361-648X
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 36
• Issue: 45
• Article Number: 455808
• DOI: https://doi.org/10.1088/1361-648X/ad6c9a
• Keywords: spin dynamics, shape anisotropy, deep UV lithography, ferromagnetic resonance, magnetic nanowires
• Public URL: https://durham-repository.worktribe.com/output/2768114