The effect of interference on magneto-optics in magneto-optical layered structures
作者:
Y. Wang,
W. M. Zheng,
S. M. Zhou,
L. Y. Chen,
W. R. Zhu,
D. L. Qian,
Y. X. Zheng,
H. Y. Zhang,
J. Huang,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 81,
issue 4
页码: 1956-1961
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.364051
出版商: AIP
数据来源: AIP
摘要:
In this article the magneto-optics of magneto-optical (M-O) layered structures have been studied theoretically and experimentally. For the air/M-O/air configuration, an analytic expression between the apparent complex Faraday rotation and the eigenvalue&fgr;˜F=e1&fgr;˜F′can be obtained, when the M-O layers are semitransparent and weakly magnetic. The interference factore1is a function of the optical constants and the M-O layer thicknessd, and the light wavelength. In these structures, the apparent Faraday rotation consists of two parts. One oscillates as a function of the M-O layer thickness and the other is proportional to the layer thickness. The oscillation period and the amplitude are determined by the optical constants of the M-O layers. For the air/M-O/reflector configuration, the Kerr rotation&fgr;˜koscillates as a function of the M-O layer thickness and approaches a constant as the thicknessd→∞. If the M-O layers are semitransparent and weakly magnetic, the apparent Kerr rotation can be expressed as&fgr;˜k=e2&fgr;˜F′.For ultrathin metallic magnetic bilayered films the Kerr rotation is proportional to the M-O layer thickness and the enhancement factor is a function of the optical constants of the M-O layer and NM reflector. The magneto-optics of a Co spinel ferrite film, Co/Cu, Fe-Ni/Cu, and Co/Si structures have been studied experimentally. ©1997 American Institute of Physics.
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