Nanoscale Confinement of All-Optical Magnetic Switching in TbFeCo - Competition with Nanoscale Heterogeneity
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- 作者：Tian-Min Liu ; Tianhan Wang ; Alexander H. Reid ; Matteo Savoini ; Xiaofei Wu ; Benny Koene ; Patrick Granitzka ; Catherine E. Graves ; Daniel J. Higley ; Zhao Chen ; Gary Razinskas ; Markus Hantschmann ; Andreas Scherz ; Joachim St枚hr ; Arata Tsukamoto ; Bert Hecht ; Alexey V. Kimel ; Andrei Kirilyuk ; Theo Rasing ; Hermann A. D眉rr
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：October 14, 2015
- 年：2015
- 卷：15
- 期：10
- 页码：6862-6868
- 全文大小：346K
- ISSN：1530-6992
文摘
Single femtosecond optical laser pulses, of sufficient intensity, are demonstrated to reverse magnetization in a process known as all-optical switching. Gold two-wire antennas are placed on the all-optical switching film TbFeCo. These structures are resonant with the optical field, and they create a field enhancement in the near-field which confines the area where optical switching can occur. The magnetic switching that occurs around and below the antenna is imaged using resonant X-ray holography and magnetic circular dichroism. The results not only show the feasibility of controllable switching with antenna assistance but also demonstrate the highly inhomogeneous nature of the switching process, which is attributed to the process depending on the material鈥檚 heterogeneity.