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. (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: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Padgett, Professor 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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