Spin waves in circular soft magnetic dots at the crossover between vortex and single domain state

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Aliev, FG (Author) Other; Sierra, JF (Author) Other; Awad, AA (Author) Other; G.N. Kakazei (Author) REIT; Han, DS (Author) Other; Kim, SK (Author) Other; Metlushko, V (Author) Other; Ilic, B (Author) Other; Guslienko, KY (Author) Other

Journal

Title: Physical Review B - Condensed Matter and Materials Physics

Vol. 79

ISSN: 1098-0121

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 78 Citations

Scopus - 82 Citations

Other information

Authenticus ID: P-003-KKF

DOI: 10.1103/physrevb.79.174433

Abstract (EN): We report on linear spin dynamics in the vortex state of Permalloy cylindrical dots subjected to an in-plane bias magnetic field. We demonstrate experimentally by a broadband ferromagnetic resonance technique and by simulations that breaking the cylindrical symmetry of the magnetic vortex gradually changes and suppresses the azimuthal spin eigenmodes below the vortex nucleation field and leads further to the appearance of new eigenmodes. The parallel microwave field pumping is shown to be a unique tool to observe spin excitation modes localized near the strongly shifted vortex core for the bias field between the vortex nucleation and annihilation fields. Meanwhile, the perpendicular field pumping, which excites the spin waves throughout the entire dot, reveals a crossover between two dynamic vortex regimes near the nucleation field.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7