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수직자기기록용 Co - Cr - Ta 박막의 자기적 성질에 대한 연구
황충호(C. H. Hwang),박용수(Y.S. Park),장평우(P. W. Jang),이택동(T. D. Lee) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.1
Effects of Ta addition on Co-Cr pependicular magnetic recording media were studied to obtain high perpendicular coercivity at lower substrate temperature. For the purpose, magnetic properties and microstructures of Co-Cr-(Ta) films were studied by varying the Cr contents from 17 to 21 at. % and Ta contents for 0 to 3.2 at. %. Effectiveness of Ta addition in increasing perpendicular coercivity was significant for lower Cr content films. The increasement of perpendicular coercivity was more pronounced for the films deposited on 100℃ heated substrate in the case of (Co_(83)Cr_(17))_(98.4)Ta_(1.6) composition. The cause of the increase of perpendicular coercivity was considered due to not the grain refinement effects and the improvement of c-axis alignments but increase of Ta and Cr segregation.
Co - Cr - (Ta) 수직자기기록용 박막의 자기이방성에 대한 연구
황충호(C. H. HWANG),박용수(Y. S. PARK),신경호(K. H. Shin),이택동(T. D. Lee) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
In order to investigate the origin of an increase in the coercivity with the Ta addition to Co-Cr films, the perpendicular magnetic anisotropy of Co-Cr film and CoCrTa film was measured by a torque magnetometer and VSM. In Co-Cr binary alloy film, the uniaxial anisotropy increased with increasing Cr content. The perpendicular magnetic anisotropy of CO_(81.7)Cr_(16.7),Ta_(1.6) film was larger than that of CO_(81)Cr_(19) film, both of which were deposited at the same substrate temperature of 100 ℃. The change in the perpendicular magnetic anisotropy with annealing was studied to understand the Ta addition effect. The amount of decrease in perpendicular magnetic anisotropy of the CoCrTa film by the annealing was larger than that of Co-Cr film. And the perpendicular magnetic anisotripies of Co-Cr film and CoCrTa film after annealing were almost the same. The cause of this was interpretated as the enhanced segregation of solute atoms in the Ta added thin film in the as-deposited state. The enhanced segregation of solute atoms increases the perpendicular magnetic anisotropy of the film, and causes the increase of perpendicular coercivity of the film.
이상 스테인리스강의 냉간가공 및 열처리에 의한 내식성 및 기계적 성질의 변화
김영식,남승의,박용수,황충호 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.7
Effects of cold work and aging treatment on corrosion and microhardness of duplex stainless steels were studies employing weight-loss tests, polarization tests and micronardness test. Degree of cold work applied were 15%, 30% and 40%, and temperatures for aging were 475℃, 600℃ and 800℃. Cold work enhanced the corrosion resistance, and this fact was attributed to decrease in the amount of ferrite and change in its configuration. Cold work higher than 15% was detrimental, because increase in defect concentration counteracted against the beneficial effects of ferrite. Aging treatment improved the corrosion resistance and the hardness. Spinodal decomposition at 475℃ and ferrite-austenite transformation at higher temperatures were attributed to the improvements. Applying 30% cold work followed by aging heat treatment at 475℃ was found the best in treating the duplex stainless steels studied.