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Proceedings Paper

Spectroscopic and magnetic properties of colloidal transition metal-doped transparent conducting oxide nanocrystals as building blocks for spintronic materials
Author(s): Shokouh S. Farvid; Ting Wang; Pavle V. Radovanovic
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Paper Abstract

The synthesis of colloidal Cr3+-doped In2O3 NCs with the body-centered cubic bixbyte-type crystal structure, and Cr3+-doped SnO2 NCs with the rutile crystal structure was described. Ligand-field electronic absorption spectroscopy suggests that Cr3+ dopants have quasi-octahedral coordination in both In2O3 and SnO2 NC host lattices. Unlike free-standing nanocrystals, the nanocrystalline films fabricated from colloidal Cr3+-doped In2O3 and SnO2 nanocrystals exhibit room temperature ferromagnetism. Analogous magnetic behavior suggests the same origin of ferromagnetic ordering in both materials. The observed ferromagnetism has been related to the existence of extended structural defects, formed at the interfaces between nanocrystals in nanocrystalline films. These structural defects are likely responsible for the formation of charge carriers which mediate the dopant magnetic moment ordering.

Paper Details

Date Published: 1 September 2010
PDF: 7 pages
Proc. SPIE 7760, Spintronics III, 77600B (1 September 2010); doi: 10.1117/12.860894
Show Author Affiliations
Shokouh S. Farvid, Univ. of Waterloo (Canada)
Ting Wang, Univ. of Waterloo (Canada)
Pavle V. Radovanovic, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 7760:
Spintronics III
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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