Wang ZK, Lim HS, Liu HY, Ng SC, Kuok MH, Tay LL, Lockwood DJ, Cottam MG, Hobbs KL, Larson PR, Keay JC, Lian GD, Johnson MB. Spin waves in nickel nanorings of large aspect ratio.
Phys Rev Lett 2005;
94:137208. [PMID:
15904029 DOI:
10.1103/physrevlett.94.137208]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2004] [Indexed: 05/02/2023]
Abstract
The spin dynamics of high-aspect-ratio nickel nanorings in a longitudinal magnetic field have been investigated by Brillouin spectroscopy and the results are compared with a macroscopic theory and three-dimensional micromagnetic simulations. Good agreement is found between the measured and calculated magnetic field dependence of the spin wave frequency. Simulations show that as the field decreases from saturation, the rings switch from a "bamboo" to a novel "twisted bamboo" state at a certain critical field, and predict a corresponding dip in the dependence of the spin wave frequency on the magnetic field.
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