We investigate the room temperature ferromagnetism in band gap tunable Mgx Zn1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn 1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mgx Zn1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)