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An optimized scheme for detecting magneto-optic effects in ultrathin films with Sagnac interferometry

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Title
An optimized scheme for detecting magneto-optic effects in ultrathin films with Sagnac interferometry
Author(s)
Zhu, X.D.; E.K. Ko; Kimbell, G.; Robinson, J.
Publication Date
2022-09
Journal
Review of Scientific Instruments, v.93, no.9
Publisher
American Institute of Physics Inc.
Abstract
© 2022 Author(s).Sagnac interferometry is advantageous in measuring time-reversal-symmetry breaking effects in ferromagnetic and antiferromagnetic materials as it suppresses time-reversal symmetric birefringent effects that are ubiquitous and often overwhelming in optical detection systems. When its sensitivity is limited only by the amplifier noise in the photo-detector, one needs to optimize the optical power that returns to the detector. We demonstrate an experimental scheme that maximizes the returning optical power in a Sagnac interferometry when detecting the magneto-optic effect in ultrathin films. In this scheme, the optical beam bearing the Faraday effect on a thin film is reflected at a second surface coated with a highly reflective gold film. The gold film increases the returned optical power by a factor of 4-5. For a normal-incidence Sagnac interferometer, this scheme yields an increase in the signal-to-noise ratio by the same factor. For an oblique-incidence Sagnac interferometer, this scheme should yield an increase in the signal-to-noise ratio by a factor of 20-25. For illustration, this scheme is used to measure magnetization curves and Kerr rotation images of 4.5-unit-cell thick SrRuO3(001) grown on SrTiO3(001).
URI
https://pr.ibs.re.kr/handle/8788114/12745
DOI
10.1063/5.0090061
ISSN
0034-6748
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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