• Chinese Optics Letters
  • Vol. 20, Issue 11, 111201 (2022)
Junying Ma, Feng Gu, Ying Xu, Jiaming Le, Fanlong Zeng, Yizheng Wu, and Chuanshan Tian*
Author Affiliations
  • State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • show less
    DOI: 10.3788/COL202220.111201 Cite this Article Set citation alerts
    Junying Ma, Feng Gu, Ying Xu, Jiaming Le, Fanlong Zeng, Yizheng Wu, Chuanshan Tian. Improving the sensitivity of DC magneto-optical Kerr effect measurement to 10−7rad/Hz[J]. Chinese Optics Letters, 2022, 20(11): 111201 Copy Citation Text show less

    Abstract

    A high-sensitivity DC magneto-optical Kerr effect (MOKE) apparatus is described in this Letter. Via detailed analysis on several dominating noise sources, we have proposed solutions that significantly lower the MOKE noise, and a sensitivity of 1.5×10-7 rad/Hz is achieved with long-term stability. The sensitivity of the apparatus is tested by measuring a wedge-shaped Ni thin film on SiO2 with Ni thickness varying from 0 to 3 nm. A noise floor of 1.5×10-8 rad is demonstrated. The possibility of further improving sensitivity to 10-9 rad via applying AC modulation is also discussed.
    ΔI(cos2α+2θksin2α)×Is.

    View in Article

    Δθk1β×(ΔEsE¯sΔEpE¯p)=2β×ΔEsE¯s.

    View in Article

    Junying Ma, Feng Gu, Ying Xu, Jiaming Le, Fanlong Zeng, Yizheng Wu, Chuanshan Tian. Improving the sensitivity of DC magneto-optical Kerr effect measurement to 10−7rad/Hz[J]. Chinese Optics Letters, 2022, 20(11): 111201
    Download Citation