Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1802750 | Journal of Magnetism and Magnetic Materials | 2009 | 4 Pages |
Through first-principles total-energy calculations, the effect of H-impurity on the magnetic properties of Co-doped ZnO is studied. Instead of an antibonding location, a bond-centered location of Co–O is the most stable location for isolated H in Co-doped ZnO with a strong bond with oxygen which results in the Co neighbor displaced from the host site to form a Co dimer with the other Co. At the most stable position, due to the strong hybridization between the H-impurity states and the Co 3d3d-t2gt2g minority spin states at the Fermi level in the gap, H-impurity can mediate a strong short-ranged and long-ranged ferromagnetic spin–spin interaction between neighboring Co atoms. Results based on first-principles total-energy calculations show that H-impurity is a very effective agent that can make Co-doped ZnO process high-temperature ferromagnetism.