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(Color online) (a) M-H curve measured at 300 K for Zn0.85Co0.15O and Zn0.8Co0.2O before hydrogen injection. (b) M-H curve measured at 300 K for Zn0.9Co0.1O, Zn0.85Co0.15O, and Zn0.8Co0.2O treated at different rf-power for hydrogen plasma.
(Color online) SIMS depth profile of elements (Zn, Co, O, and H) for each sample according to Co concentration and hydrogen treatment conditions. Hydrogen contents showed the strong dependency on the plasma treatment condition.
(Color online) Comparison of hydrogen content (hydrogen profile: open circle) and remnant magnetization (star) for each sample according to Co concentration and hydrogen treatment conditions. The dashed line is a guide of hydrogen contents to the eye.
(Color online) XRD patterns according to Co concentration and hydrogen treatment conditions with calculated Bragg peak position for ZnO, CoO, and Co.
(Color online) TEM image for Zn0.85Co0.15O (a) before and (b) after hydrogen treatment. Dash circle indicates the different phase from single ZnO phase, which is assumed to be due to CoO phase.
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