期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 649, 期 -, 页码 891-898出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.07.218
关键词
Diluted magnetic semiconductors; X-ray absorption; Spintronics
资金
- Helmholtz-Gemeinschaft Deutscher Forschungszentren [HGF-VH-NG-713]
- Deutsche Forschungsgemeinschaft [Bu 2956/1-1, SCHM1663/4-1]
- Department of Science and Technology (DST), India [INT/ITALY/P-13/2012 (SP-PhT.1/89)]
- University Grant Commission (UGC), India [20-12/2009(ii)EU-IV]
In order to address existing unresolved issues related to intrinsic and extrinsic origins of ferromagnetism in Zn1-xCoxO based diluted magnetic semiconductors for varying x, the present work aims to investigate the tunable ferromagnetism triggered in paramagnetic Zn0.95Co0.05O films using 500 KeV inert xenon ion irradiation of different fluences. The origin of ferromagnetism in post irradiated Zn0.95Co0.05O films is understood from different densities of bound magnetic polarons (BMPs) formation through correlated spins of tetrahedrally substituted Co2+ ions and anionic vacancies. The alteration in crystallographic positions of Zn, Co cations, and O anions in the tetrahedral environment as analyzed from Zn and Co K-edgeX-ray absorption and O 1s photoemission is a crucial factor for the stabilization of different density of BMPs. Magnetic field and temperature dependence of X-ray magnetic circular dichroism at the Co L-2,L-3 edge provide experimental evidence of purely paramagnetic contribution from well localized Co2+ ions of Co sublattice for paramagnetic Zn0.95Co0.05O film. The paramagnetic Co2+ ions of Co sublattice persist in irradiated films, which reveal BMPs formation as the origin of ferromagnetism. (C) 2015 Elsevier B.V. All rights reserved.
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