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Nd 치환 RE - TM 막의 자기 및 자기광학적 특성
이정구(J. G. Lee),최영준(Y. J. Choe),임은식(E. S. Leem),이세광(S. K. Lee),김순광(S. K. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
Magnetic and Magneto-optical characteristics of NdTbFeCo alloy films and NdTbFeCo /TbFeCo double-layered films have been investigated. It was observed that the Kerr rotation(θk) in the short wavelength region increased and the coercivity decreased as the substitutional amount of Nd for Tb in NdTbFeCo film at the constant FeCo content. In spite of the increased θk, a small coercivity of NdTbFeCo film made this medium unsuitable for magneto-optical recording medium at short wavelength. An effort was made to improve coercivity by exchange coupling with TbFeCo film of high coercivity. In the exchange-coupled Nd_(16.9)Tb_(l5.2)Fe_(50.4)Co_(17.5)(150 Å) /Tb_(21.1)Fe_(65.0)Co_(13.9) (300 Å) double-layered film, the magnetization reversal switching field and the Kerr rotation angle were increased to about 6.0 KOe and 0.32˚ at 500 ㎚, respectively. This result indicates that exchange-coupled NdTbFeCo /TbFeCo film can be a promising candidate for agneto-optical rerding medium short wavelenhth.
손장우(J. W. Son),조순철(S. C. Jo),이세광(S. K. Lee),김순광(S. K. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.3
A method was studied which simulate signal and noise for magneto-optical disk drive system Recorded mark patterns and incident laser beam were modeled and discretized. Using them readout waveformj and amplitude were simulated. Adding Gaussian random noise to the readout signal and executing one dimensional discrete FFT (Fast Fourier Transform) algorithm, signal and noise spectrum was estimated. From the spectrum, CNR (Carrier to Noise Ratio) was obtained.