@article{oai:repo.qst.go.jp:00048719,
 author = {前川, 雅樹 and 阿部, 浩之 and 宮下, 敦巳 and 境, 誠司 and 山本, 春也 and 河裾, 厚男 and 前川 雅樹 and 阿部 浩之 and 宮下 敦巳 and 境 誠司 and 山本 春也 and 河裾 厚男},
 issue = {17},
 journal = {Applied Physics Letters},
 month = {Apr},
 note = {We investigated ferromagnetism of ZnO induced by oxygen implantation using spin-polarized positron annihilation spectroscopy together with magnetization measurements. The magnetization measurements showed appearance of ferromagnetism after oxygen implantation and its disappearance during post-implantation annealing at above 573 K. The Doppler broadening of annihilation radiation (DBAR) spectrum showed asymmetry upon field reversal after the oxygen-implantation. The obtained differential DBAR spectrum between positive and negative magnetic fields was well-explained with a theoretical calculation considering zinc vacancies. The disappearance of field reversal asymmetry of DBAR spectrum by annealing agreed with that of ferromagnetism observed by magnetization measurements. These suggest that the radiation-induced zinc vacancies are the source for the observed ferromagnetism of ZnO.},
 pages = {172402-1--172402-5},
 title = {Vacancy-induced ferromagnetism in ZnO probed by spin-polarized positron annihilation spectroscopy},
 volume = {110},
 year = {2017}
}