http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Controlling of magnetic phase in delta doped (Ga,Mn)As structures
Jisang Hong 한국자기학회 2005 한국자기학회 학술연구발표회 논문개요집 Vol.15 No.1
With FLAPW calculations, we first theoretically found that one can manipulate the magnetic exchange interaction between two magnetic monolayer in Mn doped GaAs structures. The magnetic phase change was occurred when the interlayer distance is about 16 A. The ferromagnetic interaction was stable if the Mn-Mn distance is less than 16 A although the ferromagnetic phase stability was modified by carrier type. We hope our theoretical results stimulate experimental verification.
Spin Polarization of CuO Nanowires
Jisang Hong 한국자기학회 2006 Journal of Magnetics Vol.11 No.1
??Very recently, it was presented that the one dimensional (1D) CuO atomic chains can maintain large magnetic moments. In this work, we analyzed m-resolved density of states (DOS) to understand the peculiar spin polarization occurred in Cu atoms. It was found that the /m/=1 states play an essential role in the spin polarization of Cu atoms. In addition, we calculated magnetic anisotropy energy (MAE) and observed that the distribution of MAE is strongly sensitive to the interatomic distance between Cu and O atoms. Besides, it was revealed that the contribution to MAE comes for the second half of Brillouin zone (BZ).
Oxygen induced spin polarized ferromagnetic state of 1D CuO nanowire
jisang hong,R.Q. Wu 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.4
With the full potential linearized augmented plane wave (FLAPW) method, we have investigated if a 1D Cu nanowire can display spin polarized phase. Interestingly, it was obtained that the oxygen has dramatic effect on the magnetic state manifesting spin polarized ferromagnetic ground state for free standing CuO wire, whereas pure unsupported 1D Cu wire has non-magnetic state. Our numerical results show that the magnetic moments of Cu and O atoms are very sensitive to the inter-atomic distance between Cu and O atoms, while the sum of magnetic moments from Cu and O atoms are almost constant in the range of plastic deformation. In addition, it was displayed that spin polarized 1D CuO nanowires were shown to have nearly half metallic features. We also extracted the yield stress of the CuO nanowires, and found that the maximum plastic deformation occurred at the inter-atomic distance of 3.8 a.u. between Cu and O atoms. In addition, the ferromagnetic CuO nanowires prefer perpendicular magnetization to the chain axis fro most Cu-O interatomic distances.