Optically Induced Tunable Magnetization Dynamics in Nanoscale Co Antidot Lattices
详细信息 查看全文
- 作者：Ruma Mandal ; Susmita Saha ; Dheeraj Kumar ; Saswati Barman ; Semanti Pal ; Kaustuv Das ; Arup Kumar Raychaudhuri ; Yasuhiro Fukuma ; YoshiChika Otani ; Anjan Barman
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：April 24, 2012
- 年：2012
- 卷：6
- 期：4
- 页码：3397-3403
- 全文大小：477K
- 年卷期：v.6,no.4(April 24, 2012)
- ISSN：1936-086X
文摘
We report the time-domain measurements of optically induced precessional dynamics in a series of Co antidot lattices with fixed antidot diameter of 100 nm and with varying lattice constants (S) between 200 and 500 nm. For the sparsest lattice, we observe two bands of precessional modes with a band gap, which increases substantially with the decrease in S down to 300 nm. At S = 200 nm, four distinct bands with significant band gaps appear. The numerically calculated mode profiles show various localized and extended modes with the propagation direction perpendicular to the bias magnetic field. We numerically demonstrate some composite antidot structures with very rich magnonic spectra spreading between 3 and 27 GHz based upon the above experimental observation.