We perform a first-principles study of electronic structure and magnetism of C-doped zinc-blende ZnO using the full-potential linearized augmented plane wave method. Results show that C-doped zinc-blende ZnO exhibits ...We perform a first-principles study of electronic structure and magnetism of C-doped zinc-blende ZnO using the full-potential linearized augmented plane wave method. Results show that C-doped zinc-blende ZnO exhibits half-metallic ferromagnetism with a stable ferromagnetic ground state. The calculated magnetic moment of the 32-atom supercell containing one C dopant is 2.00 μ B , and the C dopant contributes most. The calculated low formation energy suggests that C-doped zinc-blende ZnO is energetically stable. The hole-mediated double exchange mechanism can be used to explain the ferromagnetism in C-doped zinc-blende ZnO.展开更多
The amorphous TbCo/Cr films with perpendicular magneto-anisotropy were prepared by nonbiased r.f magnetron sputtering and the effects of Cr underlayer on the magnetic properties of TbCo films were investigated. It is ...The amorphous TbCo/Cr films with perpendicular magneto-anisotropy were prepared by nonbiased r.f magnetron sputtering and the effects of Cr underlayer on the magnetic properties of TbCo films were investigated. It is found that both the TbCo layer thickness and the Cr underlayer can influence the magnitude of anisotropy for TbCo films. A perpendicular anisotropy as high as 4.57×10~6 erg·cm^(-3) was obtained in 120 nm thick Tb_(31)C_(69) films with a 180 nm thick Cr underlayer. But it is only 3.24×10~6 erg·cm^(-3) for the Tb_(31)Co_(69) film without Cr underlayer of the same thickness. The cross-sectional SEM observations indicate that the TbCo films with Cr underlayer consist of columns structure. It is considered that this heterogeneous structure gives rise to the anisotropy enhancement of TbCo films in case with Cr underlayer.展开更多
基金Project supported by the National Natural Science Foundation of China (Grants Nos. 11004066 and 11074081)the Research Foundation for the Doctoral Program of Higher Education of China (Grant Nos. 20100142120080 and 20090142110063)
文摘We perform a first-principles study of electronic structure and magnetism of C-doped zinc-blende ZnO using the full-potential linearized augmented plane wave method. Results show that C-doped zinc-blende ZnO exhibits half-metallic ferromagnetism with a stable ferromagnetic ground state. The calculated magnetic moment of the 32-atom supercell containing one C dopant is 2.00 μ B , and the C dopant contributes most. The calculated low formation energy suggests that C-doped zinc-blende ZnO is energetically stable. The hole-mediated double exchange mechanism can be used to explain the ferromagnetism in C-doped zinc-blende ZnO.
文摘The amorphous TbCo/Cr films with perpendicular magneto-anisotropy were prepared by nonbiased r.f magnetron sputtering and the effects of Cr underlayer on the magnetic properties of TbCo films were investigated. It is found that both the TbCo layer thickness and the Cr underlayer can influence the magnitude of anisotropy for TbCo films. A perpendicular anisotropy as high as 4.57×10~6 erg·cm^(-3) was obtained in 120 nm thick Tb_(31)C_(69) films with a 180 nm thick Cr underlayer. But it is only 3.24×10~6 erg·cm^(-3) for the Tb_(31)Co_(69) film without Cr underlayer of the same thickness. The cross-sectional SEM observations indicate that the TbCo films with Cr underlayer consist of columns structure. It is considered that this heterogeneous structure gives rise to the anisotropy enhancement of TbCo films in case with Cr underlayer.
