The magnetic particle in a box: Analytic and micromagnetic analysis of probe-localized spin wave modes

Journal Article · Tue Feb 17 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4908156· OSTI ID:1421151

Adur, Rohan; Du, Chunhui; Manuilov, Sergei A.; Wang, Hailong; Yang, Fengyuan; Pelekhov, Denis V.; Hammel, P. Chris

The dipole field from a probe magnet can be used to localize a discrete spectrum of standing spin wave modes in a continuous ferromagnetic thin film without lithographic modification to the film. Obtaining the resonance field for a localized mode is not trivial due to the effect of the confined and inhomogeneous magnetization precession. We compare the results of micromagnetic and analytic methods to find the resonance field of localized modes in a ferromagnetic thin film, and investigate the accuracy of these methods by comparing with a numerical minimization technique that assumes Bessel function modes with pinned boundary conditions. We find that the micromagnetic technique, while computationally more intensive, reveals that the true magnetization profiles of localized modes are similar to Bessel functions with gradually decaying dynamic magnetization at the mode edges. We also find that an analytic solution, which is simple to implement and computationally much faster than other methods, accurately describes the resonance field of localized modes when exchange fields are negligible, and demonstrating the accessibility of localized mode analysis.

• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: FG02-03ER46054; SC0001304
• OSTI ID: 1421151
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Vol. 117 Journal Issue: 17; ISSN 0021-8979
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English