Abstract

Detection of the magneto-optical Kerr effect with high precision is of great significance but has challenges in the field of magnetic physics and spintronic devices. Kerr rotation angle and Kerr ellipticity always coexist and are difficult to distinguish, which jointly determines the light intensity received by the detector and limits the improvement of measurement precision. In this Letter, a nonlinear weak measurement scheme for magneto-optical Kerr signals with a frequency pointer is proposed. The Kerr rotation and Kerr ellipticity can be separately detected by constructing different pre-selections and choosing the appropriate coupling strength. Moreover, two signals obtained through the weak measurement scheme have higher precision and signal-to-noise ratio compared with the standard polarimetry scheme. Our method may have important applications in the field of magneto-optic parameters measurement or magnetic sensors.

© 2021 Optical Society of America

Observation of the mixed magneto-optical Kerr effects using weak measurement

Tong Li, Lan Luo, Xinrui Li, Martin T. Dove, Sijie Zhang, Jianhong He, and Zhiyou Zhang
Opt. Express 31(15) 24469-24480 (2023)

Measurement of hysteresis loop based on weak measurement

Qi Wang, Tong Li, Lan Luo, Yu He, Xiong Liu, Zhaoxue Li, Zhiyou Zhang, and Jinglei Du
Opt. Lett. 45(5) 1075-1078 (2020)

Magneto-optical Kerr effect measurement in ultrafast Sagnac interferometry using the Jones matrix approach

Yooleemi Shin and Ji-Wan Kim
Opt. Lett. 46(14) 3364-3367 (2021)

Estimation of Kerr angle based on weak measurement with two pointers

Lan Luo, Tong Li, Yinghang Jiang, Liang Fang, Bo Liu, and Zhiyou Zhang
Opt. Express 31(9) 14432-14441 (2023)

Phase retardation measurement of an arbitrary wave plate based on magneto-optical modulating and residue detecting of the base frequency component of the signal

Qianghua Chen, Binchao Liu, Yongxi He, Huifu Luo, and Weiwei Lv
Opt. Lett. 43(18) 4514-4517 (2018)