Study on magneto-optical and magnetic properties using a magneto-optical and ellipsometric spectrometer = 광자기·타원 분광기를 이용한 자기광학 및 자기적 성질의 연구

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Recently, numerous important studies have been made in the field of magnetism with the current vacuum technologies and there has been a renaissance in magnetism. One of the most important field in magnetism is magneto-optical Kerr effects(MOKE). It has been attracting much attention due to applications of them as a tool in probing magnetism as well as a readout mechanism in high-density digital magneto-optical recording. Therefore, studying MOKE is very useful to understand the magnetic properties of novel magnetic materials and to implement the magneto-optical recording. In this study, we have designed and fabricated the magneto-optical and ellipsometric spectrometer, which was essential to study magneto-optical and magnetic properties. We have combined two equipments, magneto-optic Kerr spectrometer and spectroscopic ellipsometer, into one system. Therefore, the abilities of the system were divided by two parts ;the part for the measurement of magneto-optical Kerr rotation angle and ellipticity, and the other part for determination of the complex refractive index of a sample. Since the system was adopting a photoelastic modulator(PEM), we have studied the effects of the imperfect polarizer and analyzer in the phase-modulated magneto-optical Kerr spectrometer and spectroscopic ellipsometer using Jones matrices to represent the imperfection of the polarizer and analyzer. We have found that the polarizer and analyzer imperfections in the magneto-optical Kerr spectrometer were eliminated within the first-order approximation, because of the applied magnetic field independence. Furthermore, the polarizer and analyzer imperfections and the incorrect setting of the amplitude of the phase-modulation in the spectroscopic ellipsometer were also canceled within the first-order approximation by zone average. We have found some new measurement methods for MOKE. First of them is to determine the off-diagonal element of the dielectric tensor, without measuring the ellipti...
Advisors
Shin, Sung-Chulresearcher신성철researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
1997
Identifier
128499/325007 / 000935228
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 1997.8, [ xi, 152 p. ]

Keywords

유효매질 이론; 위상변조; Ellipsometer; 타원 해석기; 광자기 Kerr 효과; Phase-modulated; Effective medium theory; Magneto-optical kerr effect

URI
http://hdl.handle.net/10203/47574
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=128499&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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