Magnetic field measurements using magneto-optic Kerr effect sensors

Steven A. Oliver; Charles A. DiMarzio; Scott C. Lindberg; Aniruddha B. Kale

doi:10.1117/12.181938

1 November 1994 Magnetic field measurements using magneto-optic Kerr effect sensors

Steven A. Oliver, Charles A. DiMarzio, Scott C. Lindberg, Aniruddha B. Kale

Author Affiliations +

Optical Engineering, Vol. 33, Issue 11, (November 1994). https://doi.org/10.1117/12.181938

Abstract

A novel optically based magnetic field sensing technique is developed that uses a thin magnetic film as the sensing element and the longitudinal and transverse magneto-optic Kerr effects in an optical read technique. The linear system response is tested for small magnetic fields using a simple free-space ellipsometry measurement system. Measurements taken at 8 mHz showed a magnetic field sensitivity of 4 x 10^-3 Oe, with a system dynamic range of over 60 dB. The noise spectrum was dominated by 1/f noise. Calculations for a shot-noise-limited measurement system indicate that a magnetic field sensitivity of 10^-6 Oe/Hz^1/2 may be possible through enhancement of the sensing element parameters and 100-mW light sources.

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Steven A. Oliver, Charles A. DiMarzio, Scott C. Lindberg, and Aniruddha B. Kale "Magnetic field measurements using magneto-optic Kerr effect sensors," Optical Engineering 33(11), (1 November 1994). https://doi.org/10.1117/12.181938

Published: 1 November 1994

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