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- Park, Noejung
- Computational Physics & Electronic Structure Lab.
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Strong ferromagnetism in Pt-coated ZnCoO: The role of interstitial hydrogen
- Author(s)
- Shin, Jong Moon, Lee, Ho Sik, Cha, Su Young, Lee, Seunghun, Kim, Ji Young, Park, Noejung, Cho, Yong Chan, Kim, Su Jae, Kim, Sung-Kyu, Bae, Jong-Seong, Park, Sungkyun, Cho, Chae Ryong, Koinuma, Hideomi, Jeong, Se-Young
- Issued Date
- 2012-04
- Citation
- APPLIED PHYSICS LETTERS, v.100, no.17
- Abstract
- We observed strong ferromagnetism in ZnCoO as a result of high concentration hydrogen absorption. Coating ZnCoO with Pt layer, and ensuing hydrogen treatment with a high isostatic pressure resulted in a highly increased carrier concentration of 10(21)/cm(3). This hydrogen treatment induced a strong ferromagnetism at low temperature that turned to superparamagnetism at about 140 K. We performed density functional method computations and found that the interstitial H dopants promote the ferromagnetic ordering between scattered Co dopants. On the other hand, interstitial hydrogen can decrease the magnetic exchange energy of Co-H-Co complexes, leading to a reduction in the blocking temperature.
- Publisher
- AMER INST PHYSICS
- ISSN
- 0003-6951
- Keyword
- DOPED ZNO, SEMICONDUCTORS, NANOWIRE
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