http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Mossbauer 분광 분석에 의한 Ba₂(Co, Zn)₂Fe₁₂O₂₂ 내의 이온 분포 연구
최상준(S. Choi),권순주(S. J. Kwon) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.2
Y-type hexagonal ferrites(Ba₂(Co, Zn)₂Fe₁₂O₂₂ : Me=transition metal) have promising electromagnetic properties in ㎓ range. Co and Zn are good candidates for the transition metal. To understand their role on the properties, it is thus necessary to study the ion(s) distribution in that complex Y-type hexagonal ferrite structure. The authors report Mossbauer spectroscopic results from very reliable samples, which has been extensively characterized by chemical analysis, Rietveld analysis of X-ray diffraction patterns, and magnetic property measurements. Analyzing two samples, Co₂Y and Co_(1.6)Zn_(0.4)Y, conclusions are made as follow : (1) Co ions prefer the tetrahedral interstitial sites in the S-block (6c_Ⅳ) and the octahedral sites (18h_Ⅵ) at the interface of S- and T-block. (2) Partial substitution of Co with Zn (within the experimental range) does not disturb the Fe distribution.
교환 결합 상태가 다른 [Ni80Fe20 / Cu / Co / Cu] 다층 박막에서 Co 계면 삽입이 자기적 특성에 미치는 영향
이정주(J. J. Lee),최상준(J. S. Choi),홍재화(J. H. Hong),권순주(S. J. Kwon) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.2
The [Ni_(80)Fe(20)/Cu/Co/Cu] multilayers were grown by evaporation technique, and according to magnetic exchange coupling relation, magnetoresistance ratio and magnetization curve were studied by Co inserting Ni_(80)Fe_(20)/Cu interface. Insertion of Co layer to the antiferromagnetically coupled system, i. e t_(Cu) =25 Å, decrease the MR ratio contrary to previous reports. However the insertion to the ferromagnetically coupled (t_(Cu) = 27 Å) and the non-coupled (t_(Cu)=47 Å) systems increase the ratio to 3.5 % and 6 % respectively. The results imply that the insertion change the magnetic exchange coupling state as well as the spin dependent scattering of conduction electrons. Besides, insertion of Co layer between Cu and Ni_(80)Fe_(20) layer enhances thermal stability to the 300℃, which indicates that insertion of Co has a role of the effective diffusion barrier.