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High-resolution magneto-optic measurements with a Sagnac interferometer (invited)

J. Appl. Phys. 75, 6872 (1994); doi:10.1063/1.356814

Issue Date: 15 May 1994

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A. Kapitulnik, J. S. Dodge, and M. M. Fejer
Department of Applied Physics, Stanford University, Stanford, California 94305
A technique for measuring the Faraday effect and the magneto-optic Kerr effect has been developed. In a Sagnac interferometer, two optical beams follow identical paths in opposite directions. Effects which break time-reversal symmetry, such as magneto-optic effects, will cause destructive interference between the two beams. By measuring the phase shift between circular polarization states reflected from a magnetized sample, the polar magneto-optic Kerr effect is measured to an accuracy of 3 µrad, with a spatial resolution of 2 µm. The interferometric technique provides a number of advantages over conventional polarizer methods, including insensitivity to linear birefringence, the ability to completely determine the magnetization vector in a region, and the ability to sensitively measure magneto-optic effects without an external field. It is also shown that this device has great potential if incorporated into a near-field optical device. Some of the considerations for the design of a near-field Sagnac magneto-optic sensor are introduced and the advantages of the device are discussed. Some preliminary experiments are shown. Journal of Applied Physics is copyrighted by The American Institute of Physics.
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KEYWORDS and PACS

Keywords
PACS
  • 07.60.Ly
    Specific instrumentation and techniques of general use in physics Optical instruments and techniques Interferometers and interferometry
  • 78.20.Ls
    Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of bulk materials Magnetooptical effects
  • YEAR: 1994

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ISSN:
0021-8979 (print)   1089-7550 (online)
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