Open AccessStrong ferromagnetism in Pt-coated ZnCoO: The role of interstitial hydrogen
Author(s) -
Jong Moon Shin,
Hosik Lee,
Su Young,
Seunghun Lee,
Do Young Kim,
Noejung Park,
Yong Chan Cho,
Su Jae Kim,
SungKyu Kim,
JongSeong Bae,
Sungkyun Park,
Chae–Ryong Cho,
Hideomi Koinuma,
SeYoung Jeong
Publication year - 2012
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4705304
Subject(s) - ferromagnetism , hydrogen , materials science , dopant , condensed matter physics , superparamagnetism , doping , magnetization , chemistry , magnetic field , optoelectronics , physics , organic chemistry , quantum mechanics
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.open7
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom