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.

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