NDLI: Modification of crystal anisotropy and enhancement of magnetic moment of Co-doped SnO2 thin films annealed under magnetic field.

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Modification of crystal anisotropy and enhancement of magnetic moment of Co-doped SnO2 thin films annealed under magnetic field.

Content Provider	Europe PMC
Author	Loya-Mancilla, Sagrario M Poddar, Pankaj Das, Raja Ponce, Hilda E Esparza Templeton-Olivares, Ivan L Solis-Canto, Oscar O Ornelas-Gutierrez, Carlos E Espinosa-Magaña, Francisco Olive-Méndez, Sion F
Copyright Year	2014
Abstract	Co-doped SnO2 thin films were grown by sputtering technique on SiO2/Si(001) substrates at room temperature, and then, thermal treatments with and without an applied magnetic field (HTT) were performed in vacuum at 600°C for 20 min. HTT was applied parallel and perpendicular to the substrate surface. Magnetic M(H) measurements reveal the coexistence of a strong antiferromagnetic (AFM) signal and a ferromagnetic (FM) component. The AFM component has a Néel temperature higher than room temperature, the spin axis lies parallel to the substrate surface, and the highest magnetic moment m =7 μB/Co at. is obtained when HTT is applied parallel to the substrate surface. Our results show an enhancement of FM moment per Co+2 from 0.06 to 0.42 μB/Co at. for the sample on which HTT was applied perpendicular to the surface. The FM order is attributed to the coupling of Co+2 ions through electrons trapped at the site of oxygen vacancies, as described by the bound magnetic polaron model. Our results suggest that FM order is aligned along [101] direction of Co-doped SnO2 nanocrystals, which is proposed to be the easy magnetization axis.
ISSN	19317573
Journal	Nanoscale Research Letters
Volume Number	9
PubMed Central reference number	PMC4256971
Issue Number	1
PubMed reference number	25489286
e-ISSN	1556276X
DOI	10.1186/1556-276x-9-635
Language	English
Publisher	Springer
Publisher Date	2014-11-25
Access Restriction	Open
Rights License	This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. Copyright © 2014 Loya-Mancilla et al.; licensee Springer.
Subject Keyword	Crystal anisotropy Magnetic anisotropy Thin film Ferromagnetism Antiferromagnetism Magnetic moment Spin axis Diluted magnetic oxide
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics Materials Science

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