All-optical helicity-dependent magnetic switching by first-order azimuthally polarized vortex beams

作者：Wang, Sicong; Wei, Chen; Feng, Yuanhua; Cao, Yaoyu; Wang, Haiwei; Cheng, Weiming; Xie, Changsheng; Tsukamoto, Arata; Kirilyuk, Andrei; Rasing, Theo; Kimel, Alexey, V; Li, Xiangping^*

来源：Applied Physics Letters, 2018, 113(17): 171108.

DOI：10.1063/1.5051576

• MANIPULATION
• GENERATION
• FILMS
• FOCUS

In this letter, a method to realize all-optical helicity-dependent magnetic switching (AO-HDS) using a first-order azimuthally polarized vortex (FAPV) beam is demonstrated. Numerical calculations of the focal fields of FAPV beams reveal that left-handed and right-handed circular polarizations are generated due to the interaction between the polarization singularity and the helical wave front. Its feasibility for AO-HDS is experimentally demonstrated in Gd27Fe63.87Co9.13 under low numerical aperture (NA) conditions and within a narrow fluence It is numerically predicted that under high NA conditions, the lateral size of magnetic bits recorded by FAPV beams can be nearly 30% smaller than that obtained by circularly polarized beams, which opens a promising route to realize ultrafast and ultrahigh-density magnetic recording. Published by AIP Publishing.

• 出版日期2018-10-22
• 单位华中科技大学; 暨南大学