Magnetic properties of submicron circular permalloy dots

被引:21
作者
Gubbiotti, G [1 ]
Carlotti, G
Nizzoli, F
Zivieri, R
Okuno, T
Shinjo, T
机构
[1] Univ Perugia, Dept Phys, I-06100 Perugia, Italy
[2] Natl Inst Phys Mat, I-06123 Perugia, Italy
[3] Univ Ferrara, Dept Phys, I-44100 Ferrara, Italy
[4] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan
关键词
Brillouin light scattering (BLS); magnetic vortex; permalloy; spin waves;
D O I
10.1109/TMAG.2002.801920
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Both the static and the dynamical magnetic properties of a square array of circular permalloy dots, characterized by a magnetic vortex configuration of the magnetization, have been investigated by means of magneto-optical Kerr effect and of Brillouin light scattering (BLS) from thermally excited spin waves. The measured hysteresis loop can be satisfactorily reproduced by micromagnetic simulations, showing that the vortex configuration is stable over a wide range of applied field. The high frequency response of the dots was analyzed by BLS measurements performed under external magnetic field intensity large enough to uniformly magnetize the dots. Evidence is given of a marked discretization of the spin wave spectrum with respect to the case of the continuous permalloy film, where only one peak, corresponding to the Damon-Eshbach mode, was detected. The experimental frequencies have been compared to those calculated using a recently developed analytical model for a flat uniformly magnetized cylindrical dot.
引用
收藏
页码:2532 / 2534
页数:3
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