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채근화(K.H. Chae),송종환(J.H. Song),정성문(S.M. Jung),장홍규(H.G. Jang),주장현(J.H. Joo),강석태(S.T. Kang),최범식(B.S. Choi),김상옥(S.O. Kim),황정남(C.N. Whang) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1
이온선혼합의 열충격으로 야기되는 등방적 또는 이방적 원자이동을 정량적으로 묘사하기 위한 모형을 제시하였다. 불순물 확산에서 원자들의 이동비는 구성원자들의 활성화에너지에 의존한다. 이 모형은 0에 가까운 혼합열과 비교적 높은 활성화에너지를 가진 이중층들의 실험결과들을 만족스럽게 예견한다. 불순물 확산에서 구성원자들의 활성화에너지가 크게 차이가 나는 계들은 이방적 원자이동을 보여주는 반면, 비슷한 활성화에너지를 가지는 계들은 등방적 원자이동을 나타낸다. A simple model is presented to describe quantitative the isotropic and anisotropic atomic transport in thermal spike induced ion mixing. The ratio of atomic transport depends on the activation energies of constituents for the impurity diffusion. The model predicts fairly satisfactory the trend of experimental observations for the bilayer systems which have near zero heats of mixing and relatively high spike activation energies. The systems which have large difference in activation energies of constituents for the impurity diffusion show the anisotropic atomic transport, while the systems having similar activation energies for the impurity diffusion reveal the isotropic atomic transport.
Room-temperature ferromagnetism of Cu ion-implanted Ga-doped ZnO
이종한,신상원,채근화,김동환,송종한 한국물리학회 2012 Current Applied Physics Vol.12 No.3
1 MeV Cu2+ ions have been implanted into un-doped ZnO and Ga-doped ZnO films with a dose of 1 × 1017 ions/cm2 at room-temperature. Cu ion-implanted Ga-doped ZnO had ferromagnetism at roomtemperature and the saturation magnetization of this sample was estimated to be 0.12 mB per Cu, while the Cu ion-implanted un-doped ZnO did not show ferromagnetic behavior. Near-edge X-ray fine structure (NEXAFS) spectroscopy revealed that a partial amount of implanted Cu ions existed as Cu2+ (d9)state in Ga-doped ZnO film. On the other hand, almost Cu atoms existed as Cu1+ (d10) state in un-doped ZnO film. However, the subsequent annealing at temperature above 800 ℃ on this ferromagnetic sample induced the annihilation of ferromagnetism due to the formation of non-ferromagnetic Cu2O phase.