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Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

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Strong ferromagnetism in Pt-coated ZnCoO: The role of interstitial hydrogen

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Title
Strong ferromagnetism in Pt-coated ZnCoO: The role of interstitial hydrogen
Author
Shin, Jong MoonLee, Ho SikCha, Su YoungLee, SeunghunKim, Ji YoungPark, NoejungCho, Yong ChanKim, Su JaeKim, Sung-KyuBae, Jong-SeongPark, SungkyunCho, Chae RyongKoinuma, HideomiJeong, Se-Young
Keywords
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
201204
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.100, no.17, pp. -
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.
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DOI
http://dx.doi.org/10.1063/1.4705304
ISSN
0003-6951
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SNS_Journal Papers
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