Magnetism of TiO and TiO₂ Nanoclusters

Authors

Xiaohui Wei, University of Nebraska-Lincoln
Ralph Skomski, University of Nebraska-LincolnFollow
Balamurugan Balasubramanian, University of Nebraska-LincolnFollow
Z. G. Sun, University of Nebraska-Lincoln
Stephen Ducharme, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

2009

Comments

Published in JOURNAL OF APPLIED PHYSICS 105, 07C517 (2009). Copyright © 2009 American Institute of Physics. Used by permission.

Abstract

Nanoclusters of rocksalt TiO, anatase TiO₂, and rutile TiO₂ were produced by cluster deposition and examined with transmission-electron microscopy, x-ray diffraction, and magnetization measurements. The clusters are all magnetic at room temperature, but the magnetization is structure-dependent. The hysteresis loops show coercivities that are of the order of 100 Oe and all films show a preferential in-plane magnetization direction. The size dependence of the magnetization was investigated for rutile clusters with average sizes from about 15 to 40 nm. The analysis of the measurements indicates that the magnetism is predominantly located near the surface of the clusters and characterized by a nominal value of 7.6 µ_B&#;nm².