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An intensity-stabilized He-Ne-Laser for measuring small magneto-optic Kerr rotations from thin ferromagnetic-films

Bland, J.A.C., Padgett, M.J., Butcher, R.J., and Bett, N. (1989) An intensity-stabilized He-Ne-Laser for measuring small magneto-optic Kerr rotations from thin ferromagnetic-films. Journal of Physics E: Scientific Instruments, 22 (5). pp. 308-312. ISSN 0022-3735 (doi:10.1088/0022-3735/22/5/008)

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Publisher's URL: http://iopscience.iop.org/0022-3735/22/5/008

Abstract

The change in intensity of light transmitted through an analysing polariser after reflection from a ferromagnetic surface can be related to the magneto-optic Kerr rotation. The construction of an inexpensive apparatus for measuring small rotations based on the use of an external intensity stabiliser for a laboratory He-Ne laser is discussed. The authors examine the limitations on the signal-to-noise ratio as consequence of the detector noise, shot noise and technical noise present in the system. An intensity stability of 0.05% has been achieved and has enabled them to obtain hysteresis loops from a 5 nm thick iron film with a signal to noise ratio of 40:1 for a data collection time of 100 s.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Padgett, Prof Miles
Authors: Bland, J.A.C., Padgett, M.J., Butcher, R.J., and Bett, N.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics E: Scientific Instruments
ISSN:0022-3735

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