The comparison of the structural, magnetic, electronic, and optical properties for ZnCoO and Co-precipitation samples

Kim, Gyeong Rip; 조용찬,; Kim, Su Jae; 이승훈,; Jeong, Se-Young; Bae, Jong Seong; Jeong, I. S.; Kim, Wonkyung; Cho, Chae-Ryong; Park, Sungkyun

doi:10.3938/jkps.56.1374

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2017

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“…The absorption spectra of the thin films were almost identical, with no reductions or shifts in the features corresponding to the Co 2+ d-d * transition. This indicates that the valence state of the Co is not affected by hydrogen treatment 57, 58 . We also derived the optical band gap energy of each thin film using a Tauc plot.…”

Section: Resultsmentioning

confidence: 87%

Formation of ferromagnetic Co–H–Co complex and spin-polarized conduction band in Co-doped ZnO

Lee

Park

Kim

et al. 2017

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Magnetic oxide semiconductors with wide band gaps have promising spintronic applications, especially in the case of magneto-optic devices. Co-doped ZnO (ZnCoO) has been considered for these applications, but the origin of its ferromagnetism has been controversial for several decades and no substantial progress for a practical application has been made to date. In this paper, we present direct evidence of hydrogen-mediated ferromagnetism and spin polarization in the conduction band of ZnCoO. Electron density mapping reveals the formation of Co–H–Co, in agreement with theoretical predictions. Electron spin resonance measurement elucidates the ferromagnetic nature of ZnCoO by the formation of Co–H–Co. We provide evidence from magnetic circular dichroism measurements supporting the hypothesis that Co–H–Co contributes to the spin polarization of the conduction band of hydrogen-doped ZnCoO.

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Section: Resultsmentioning

confidence: 87%