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In situ 법에 의한 Cu-Nb3Sn 복합재료선재의 초전도특성과 이에 미치는 Ti의 영향 (1)
박현순,서수정,이은덕,안재민 ( H . S .Park,S . J . Suh,U . D . Lee,J . M . Ahn ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.1
The Cu-Nb₃Sn composites wire as a superconducting material was prepared by in situ method as follow : Cu-15wt.%Nb alloys which were melted in a high-frequency induction furnace and casted in bar were cold-worked up to the final diameter of 0.24㎜, electroplated with Sn, pre-treated in two steps and then diffused at 550∼650℃ for 24∼96hrs. The overall J_c and T_c of the specimens were measured by the four point-probe method at 10K in the magnetic field of 0 Tesla. The overall J_c of the composites wire which diffused at 550℃ after pre-treating in two steps were generally higher than those of the wire at either 600℃ or 650℃. For the specimens diffused at 550℃, the overall J_c were increased until 72hrs. of diffusion time and then decreased. However, in case of diffusion at 600℃ and 650℃, the overall J_c were gradually decreased from the beginning. The maximum overall J_c obtained in this experiment was 1.3×10⁴A/㎠, which was measured for the specimen diffused at 550 for 72hrs. When the specimens were diffused at 550℃, for 72hrs. after pre-treating, the measured critical temperature, T_c was 16.19K. Similar T_c value were obtained in other specimens regardless of diffusion time and temperature.
나노결정구조 Fe - Nb - B - N 박막의 미세구조 및 자기적 특성
박진영(J. Y. Park),서수정(S. J. Suh),노태환(T. H. Noh),김광윤(K. Y. Kim),김종열(J. Y. Kim),김희중(H. J. Kim) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.5
The microstructure and magnetic properties of Fe-Nb-B-N thin film alloys, which produced by rf magnetron sputtering method in Ar + N₂ mixed gas atmosphere, were investigated. The Fe_(70)Nb₁₄B₁₁N_5 films, annealed at 590℃, exhibit soft magnetic properties: 4 πMs = 16.5 kG, Hc = 0.13 Oe and μ_(eff) (1~10 ㎒) =5,000. The frequency stability of the Fe-Nb-B-N films has also been found to be good up to 10 ㎒.<br/> The Fe-Nb-B-N thin film alloys annealed at 590℃ consist of three phase; fine crystalline α-Fe phase with grain size of about 5~10 ㎚, Nb-B rich amorphous phase and Nb-nitride precipitates with the size of less than 3 ㎚. Annealed Fe-Nb-B films have two phases; α-Fe grains with the size of about 10 ㎚ and NbB rich amorphous phase. The addition of N decreased α-Fe grain size due to the precipitation of NbN. The good magnetic properties of the Fe-Nb-B-N film alloys are due to fine α-Fe grains resulting from the precipitation of NbN.
비결합형 터널접합구조에서 Cr 하지층에 따른 전자기적 특성변화
박진우(J. W. Park),전동민(D. M. Jeon),윤성용(S. Y. Yoon),이종윤(J. Y. Lee),서수정(S. J. Suh) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.3
Cross-geometrical Cr/Co/Al-Ox/Co/Ni-Fe tunnel junctions were fabricated by magnetron sputtering. To form an insulating layer, The Al layer was oxidized in an atmosphere of oxygen-argon mixture at low power after deposition. To enhance the coercivity of the bottom Co layer, The Cr seed layer was deposited on the glass and it led to increase in coercivity. The coercivity increase is due to the increase of roughness through the Cr thickness. In over oxidation time, the oxidation of Co bottom layer and flat interface of insulator can increase the bottom Co coercivity. But TMR ratio gradually decrease. TMR ratio is relevant with Cr thickness, insulator thickness, and oxidation time. The maximum TMR ratio was 14% at room temperature and the TMR ratio was decreased to half at 0.51 V.
Mn - Ir - Pt 새로운 반강자성체를 사용한 스핀밸브 거대자기저항에 관한 연구
윤성용(S. Y. Yoon),김장현(J. H. Kim),전동민(D. M. Jeon),김윤식(Y. S. Kim),이두현(D. H. Lee),서수정(S. J. Suh) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.4
The Mn_(80)Ir_(18.1)Pt_(1.9) exchange bias layers (EBLs), which have a small amounts of Pt, exhibit a high value of Hex. The Si/NiFe/Mn_(80)Ir_(18.1)Pt_(1.9) EBL shows the largest H(ex) of 187 Oe, which is equivalent to a exchange energy (Jex) of 0.146 erg/㎠. NiFe/Mn_(80)Ir_(18.1)Pt_(1.9) EBLs are estimated to have blocking temperature of about 250℃, which is higher than those of Mn-Ir EBLs and Mn-Ir-Pt EBLs with higher Pt contents. This result implies that a little addition of Pt element promotes thermal stability in the Mn-Ir-Pt EBLs. The chemical stability of Mn-Ir-Pt EBLs was characterized by potentiodynamic test, which was performed in 0.001 M NaCl solution. The current density of Mn-Ir-Pt films was gradually reduced with increasing Pt content. The present results indicate that the Mn-Ir-Pt with a small amount of Pt is suitable for an anti ferromagnetic material for a reliable spin valve giant magnetoresistance device.