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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 MoonLee, Ho SikCha, Su YoungLee, SeunghunKim, Ji YoungPark, NoejungCho, Yong ChanKim, Su JaeKim, Sung-KyuBae, Jong-SeongPark, SungkyunCho, Chae RyongKoinuma, HideomiJeong, Se-Young
Issued Date
2012-04
DOI
10.1063/1.4705304
URI
https://scholarworks.unist.ac.kr/handle/201301/2452
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84860342054
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 ZNOSEMICONDUCTORSNANOWIRE

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