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Pt 함량에 따른 CoCrPt 합금박막의 국소보자력 분포 변화
임미영(Mi-Young Im),최석봉(Sug-Bong Choe),신성철(Sung-Chul Shin) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.1
The local coercivity distribution of CoCrPt alloy films prepared by dc magnetron sputtering has been investigated by means of a magneto-optical microscope magnetometer (MOMM) capable of simultaneously measuring the local properties on 400 ㎚ spatial resolutions. Serial samples of CoCrPt alloy films were prepared with the Pt composition of a range from 6 to 28 at. %. We find that the local coercivity distribution crosses over from Gaussian to non-Gaussian distribution in CoCrPt alloy films with increasing Pt composition, with increasing trends in the width of the distribution as well as the average local coercivity. Transmission electron microscopy (TEM) studies reveal that our findings are closely correlated with the dependences of the grain size distribution and its average size on Pt concentration.
Co계 다층박막을 이용한 이중막에서 Direct Overwriting을 위한 교환결합 연구
문기석(Ki-Seok Moon),최석봉(Sug-Bong Choe),신성철(Sung-Chul Shin) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.1
We have studied the exchange coupling in bilayer systems consisting of the memory and reference layers of ebeam evaporated Co-based multilayer thin films. The structure of the specimens was examined by x-ray diffractometer and the magnetic and magneto-optic properties were measured by VSM and Kerr spectrometer, respectively. X-ray diffractometry revealed that all of the specimens had multilayer structure. The exchange coupling in bilayer systems was so strong that the magnetization reversal of one layer was simultaneously occurred with that of the other. The strength of exchange coupling was dependent on the thickness of non-magnetic spacer between the memory layer and the reference layer. It was found that exchange coupling was blocked when the spacer was thicker than about 50Å. The existence of exchange coupling was also confirmed by domain writing experiments.
김준연(Junyeon Kim),최석봉(Sug-Bong Choe) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.4
We report a theoretical description of ferromagnetic vortex motion in sub-micrometer size magnetic thin film. Based on Thiele's equation combined with later theoretical achievements, we derive the analytic description of dynamics of ferromagnetic vortex core as a damped harmonic oscillatory motion. Consequently, the relations about frequency and damping constant in damped harmonic oscillation are presented. The validity of the results is verified through micromagnetic simulation.