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CO / Cu 인공초격자에서 구리기저층에 첨가된 니켈의 양이 자기저항에 미치는 영향
민경익(K. I. Min),송용진(Y. J. Song),주승기(S. K. Joo) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
The effect of Ni content in Cu underlayer on the magnetoresistance of Cu / Co artificial superlattice has been investigated. As the content of Ni increased, the preferred orientation of artificial superlattice changed from fcc (100) to fcc (111) due to the change of the preferred orientation of the underlayer. When the content of Ni was 6 %, 26.7 % of magneto resistance with 175 Oe of saturation field could be obtained in [Cu(19 Å) / Co(30 Å)]_(20)| Cu-6%Ni(200 Å) / Si.
[Ni / Fe / Cu]20 다층 박막의 자기저항 특성에 관한 연구
이후산(H.-S. Lee),민경익(K.-I. Min),주승기(S.-K. Joo) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
[Ni / Fe / Cu] and [Fe / Ni / Fe / Cu] multilayers were prepared with three gun rf-magnetron sputtering, and dependence of magnetoresistance on the Ni / Fe thickness ratio was investigated. Vaccum annealing was tried to invetigated the effect of annealing. Oscillation of magnetoresistance on the Cu spacer thickness was dbserved in these two kinds of multilayers. When the thickness of Fe inserted into the Ni / Cu interface was about 3 Å, the maximwn value of magnetoresistance(13 %) could be observed. In a sample of 1~2 Å Fe thickness, saturation field decreased significantly, while magnetoresistace decreased slightly in comparison with the sample of 3 Å Fe. In [Cu(23 Å) / Fe(1 Å) / Ni(18 Å) / Fe(1 Å)]_(20) / Fe(80 Å) / Si, 6 % magnetoresistance with 100 Oe saturation field could be obtained. No appreciable change in magnetoresistance and saturation field could be observed by low temperature annealing. Formation of Ni-Fe alloy was not confirmed.
Co / Pd 및 Co / Pt 수직자기기록매체에 있어서 바닥층의 스퍼터링 압력과 M-H 거동의 관계
오훈상(H. S. Oh),이병일(B. I. Lee),주승기(S. K. Joo) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
Co/Pd and Co/Pt multilayered thin films for perpendicular magnetic recording media were fabricated by sputtering method and the effects of the sputtering pressure during the formation of Pd or Pt underlayers on the magnetization behavior and coercivity of the multilayers were investigated. It was found that the coercivity of Co/Pd multilayers was strongly dependent on the sputtering pressure of underlayer and could be enhanced to a large extent merely by increasing the sputtering pressure of underlayer, while in case of Co/Pt films, the degree of coercivity enhancement by controlling the sputtering pressure of underlayer was almost negligible. Coercivity variation of Co/Pd and Co/Pt multilayers with the underlayer material and deposition pressure of underlayer could be well explained in terms of the interface roughness of multilayer films induced by underlayer topology, which could also be correlated to the change of perpendicular anisotropy energy and magnetic reversal feature with the sputtering pressure of underlayer. Kerr rotation angle was hardly affected by the preparation conditions of underlayers.