Add to BibSonomy
Abstract
With features of fast and energy-efficient data writing, all-optical helicity-dependent switching (AO-HDS) has emerged as a competitive technology to satisfy the demand for the next-generation volume data storage. Unfortunately, to switch the magnetizations in different positions of the magnetic-optic film, the laser beam, the objective lens, or the magnetic recording film should be moved, limiting the advantage of AO-HDS in fast data writing. To achieve on-the-fly magnetization switching, the induced magnetization should be fully controllable. In this Letter, by focusing an azimuthally polarized vortex beam (APVB) and introducing an additional phase, a feasible strategy constructing subwavelength light-induced pure longitudinal multi-magnetization spots is proposed. In addition, the position of the multi-magnetization spots can be dynamically controlled. The distributions of the focused APVBs with different orbital angular momentum, and the induced magnetizations are surveyed. We believe that this is a practical and flexible three-dimensional magnetic recording technique with dynamic control of the recording position.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Kun Zhao, Zhiyu Zhang, Haofeng Zang, Jing Du, Yonghua Lu, and Pei Wang
Opt. Lett. 46(8) 1896-1899 (2021)
Jianjun Luo, Henwen Zhang, Sicong Wang, Liu Shi, Zhuqing Zhu, Bing Gu, Xiaolei Wang, and Xiangping Li
Opt. Lett. 44(4) 727-730 (2019)
Zewei Cai, Giancarlo Pedrini, Wolfgang Osten, Xiaoli Liu, and Xiang Peng
Opt. Lett. 45(12) 3256-3259 (2020)