Strong ferromagnetism in Pt-coated ZnCoO: The role of interstitial hydrogen
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- Strong ferromagnetism in Pt-coated ZnCoO: The role of interstitial hydrogen
- 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
- Blocking temperature; Co-dopants; Density-functional methods; Ferromagnetic orderings; High concentration; High isostatic pressure; Hydrogen absorption; Hydrogen treatments; Interstitial hydrogen; Low temperatures; Magnetic exchange
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.100, no.17, pp. -
- 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.
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