期刊
PHYSICAL REVIEW B
卷 93, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.214437
关键词
-
资金
- Portuguese Foundation of Science and Technology (FCT) [EXPL/IF/00981/2013, EXPL/IF/01191/2013]
- Investigador FCT program [SFRH/BPD/90471/2012]
- POPH/FSE programs
- Ministry of Education and Science of Ukraine [0115U002716]
- National Research Foundation, Prime Minister's Office, Singapore, under its Competitive Research Programme (CRP Award) [NRF-CRP 10-2012-03]
- European Union Horizon research and innovation program under Marie Sklodowska-Curie Grant [644348]
- IKERBASQUE (Basque Foundation for Science)
- Spanish MINECO [MAT2013-47078-C2-1-P]
We study both experimentally and using micromagnetic simulations how the spin excitation spectra of the vortex-state circular dots made of soft magnetic material change with the dot thickness t in the range t = 20-80 nm. It is found that in addition to higher-order gyrotropic modes which are nonuniform along the dot thickness and were observed earlier, azimuthal spin-wave modes having curled structure at the dot top and bottom faces appear in the spectrum when increasing the dot thickness. For the dot thickness t > 50 nm these curled modes become the lowest ones in the spin-wave excitation spectrum. It is also shown that all spin-wave modes with azimuthal index m = +/- 1 are hybridized with the vortex gyrotropic modes. However, while common azimuthal (0, +/- 1) modes are hybridized with the main gyrotropic G(0) mode and reveal large frequency splitting of their doublet, the curled modes can be hybridized with higher-order gyrotropic modes and the doublet frequency splitting vanishes with the dot thickness increase.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据