Giant magnetic moments in dilute magnetic semiconductors

• Published in: Journal of magnetism and magnetic materials Vol. 320; no. 6; pp. 895 - 897
• Main Authors: Orlov, A.F., Balagurov, L.A., Konstantinova, A.S., Perov, N.S., Yarkin, D.G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2008
• Subjects: Dilute magnetic semiconductor; Giant magnetic moment; Oxide semiconductor; 75.60.Ej; 75.50.Pp; Giant magnetic moment; Oxide semiconductor; 75.30.Cr; Dilute magnetic semiconductor
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2007.09.007

The concentration dependence of the specific magnetic moment value at room temperature in dilute semiconductor titanium oxides doped with either Co or Fe has been investigated. This value was found to increase sharply at small concentrations of magnetic impurity. The magnetic moment of 22.9 μ B per impurity atom has been revealed for TiO 2 doped with 0.15 at% Co, not yet reported in any semiconductor oxide systems. We conclude the observed giant magnetic moments are caused by the crystal lattice polarization at small impurity concentrations. The comparison with published data point to different types of the magnetization concentration dependence for various semiconductor matrixes that is probably related to the dielectric permittivity of the environment.