2007年7月
Soft spin waves and magnetization reversal in elliptical Permalloy nanodots: Experiments and dynamical matrix results
PHYSICAL REVIEW B
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- 巻
- 76
- 号
- 2
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.76.024426
- 出版者・発行元
- AMER PHYSICAL SOC
We present an experimental and theoretical investigation of magnetization reversal in Permalloy elliptical nanodots under the application of a varying (quasistatic) magnetic field directed along the hard (short) and easy (long) axes of the ellipses. The magnetic response of the particles is investigated with the magneto-optic Kerr effect (MOKE) and Brillouin scattering (BLS). Experimental MOKE results are reproduced by micromagnetic simulations. The spectrum of the normal modes, calculated with the dynamical matrix method, reproduces the BLS results. We find that when an abrupt magnetization switching occurs it is accompanied by a soft magnetic mode (different in the two cases), the symmetry of which determines the initial steps (onset) of the microscopic reversal path.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.76.024426
- ISSN : 1098-0121
- Web of Science ID : WOS:000248496200080