Please use this identifier to cite or link to this item:
Title: Surface ferromagnetism in hydrogenated-ZnO film
Authors: Li, T.
Ong, C.S. 
Herng, T.S. 
Yi, J.B. 
Bao, N.N. 
Xue, J.M. 
Feng, Y.P. 
Ding, J. 
Issue Date: 11-Apr-2011
Citation: Li, T., Ong, C.S., Herng, T.S., Yi, J.B., Bao, N.N., Xue, J.M., Feng, Y.P., Ding, J. (2011-04-11). Surface ferromagnetism in hydrogenated-ZnO film. Applied Physics Letters 98 (15) : -. ScholarBank@NUS Repository.
Abstract: Nonmagnetic ZnO films were found to exhibit room temperature ferromagnetism after hydrogen annealing at elevated temperatures (100-500°C), accompanied by (OH) bonds detection. The areal saturation magnetization Ms (∼1.1× 10-5 emu cm-2) was insensitive to film thickness, suggesting surface magnetism. The attribution to OH bonds on surface was further supported when the ferromagnetism disappeared after a short immersion for 1 s in acid solution while ferromagnetism was relatively stable in basic environment. The alternative H2 - and Ar-annealing can switch ferromagnetic "on" and "off" state, as the annealing under Ar atmosphere can reduce OH bond quantity significantly. First-principles calculations have further confirmed that OH-terminated ZnO surface belonging to the p31m two-dimensional space group has the lowest formation energy of -2.97 eV and a magnetic moment of 0.30 μB per OH due to unpaired magnetic moment of electrons occupying O 2p orbital. Insufficient surface OH concentration may result in antiferromagnetism and/or paramagnetism. © 2011 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.3581046
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Sep 22, 2022


checked on Sep 22, 2022

Page view(s)

checked on Sep 22, 2022

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.