Magnetism of TiO and TiO2 nanoclusters.

Authors :: Wei, Xiaohui
Skomski, Ralph
Balamurugan, B.
Sun, Z. G.
Ducharme, Stephen
Sellmyer, D. J.
Source :: Journal of Applied Physics; Apr2009, Vol. 105 Issue 7, p07C517-07C520, 3p, 1 Black and White Photograph, 3 Graphs
Publication Year :: 2009
Abstract: Nanoclusters of rocksalt TiO, anatase TiO<subscript>2</subscript>, and rutile TiO<subscript>2</subscript> 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<subscript>B</subscript>/nm<superscript>2</superscript>. [ABSTRACT FROM AUTHOR]