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허재혁(J. H. Her),채동훈(D. H. Chae),박성렬(S. Y. Park),이동렬(D. R. Lee),박수현(S. H. Park),정윤희(Y. H. Jeong),전인준(I. J. Jeon),김동언(D. Kim),이기봉(K.-B. Lee),박용준(Y. J. Park),김기정(K. J. Kim),김봉수(B. S. Kim) 한국진공학회(ASCT) 1999 Applied Science and Convergence Technology Vol.8 No.3(1)
서로 다른 두께를 가진 철/망간산화물 다층박막들을 펄스 레이저 증착기법으로 성장시켰다. 소각 입사 X-선 반사율 측정결과 뚜렷한 다층박막 Bragg peak들이 보임으로써 시료가 좋은 층상구조를 가지고 있음을 확인할 수 있었고, 이를 분석하여 정량적인 구조변수를 얻었다. 또한 MnO의 (111)면에 해당하는 X-선 회절 peak를 통해 망간산화물은 대부분 MnO 형태로 존재함을 알았다. 이러한 Mn+²의 자기적 특성을 알아보기 위해 XMCD를 측정하였으며, 계면근처에서 MnO의 자기모멘트는 Fe과는 반대방향으로 정렬하고 있음이 확인되었다. Fe/MnO multilayers with different bilayer thicknesses were grown by pulsed laser deposition method. Grazing incidence X-ray reflectivity results showed obvious multilayer Bragg peaks implying highly layered samples and, through their analysis, some structural parameters were quantitatively estimated. From the X-ray diffraction peak corresponding to MnO(111), Mn-oxide turned out to be dominantly MnO. To characterize the magnetic properties of Mn+², XMCD were carried out. Magnetic moments of MnO near interfaces were ordered in the opposite direction to those of Fe.
민병일(B. I. Min),정윤희(Y. H. Jeong),양충진(C. J. Yang) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
Electronic and magnetic propertis of the rare-earth permanent magnet, Nd₂Fe₁₄B, are investigated by performing self-consistent local density functional electronic structure calculations. Employing the LMTO (linearized muffin-tin orbital) band method, we have obtained the electronic band structures for both paramagnetic and ferromagnetic phases of Nd₂Fe₁₄B. Based on the energy band structures, we have studied various physical properties, such as electronic and magnetice structures, we have studied various physical properties, such as electronic and magnetic structures and the bonding effect between the rare-earth and transition metals. It is found that the boron atom substantially reduces the magnetic moment of neighboring Fe atoms through the hybridization interaction and that it plays an important role in stabilizing the structure. The average magnetic moment of Fe atoms in the ferromagnetic phase is estimated to be 2.15 μ_B. The Fe atom in the j2-site, which is located farthest from the B atom and surrounded by 12 Fe nearest neighbors, has the biggest magnetic moment (2.7 μ_B), while the Fe in the e-site, which interacts most strongly with B atoms, has the smallest magnetic moment (1.9 μ_B).