Magnetic Properties of Transition Metal Doped SnO₂ by Mechanical Synthesis

Abstract

Transition metal (TM=V, Fe,Ni and Cu) doped rutile-type SnO₂ were prepared by mechanical milling (MM). XRD results showed that the particle diameter d of host SnO₂ powder was 16 nm after MM. The MM for the mixtures of TM oxide and SnO₂ at 500 rpm for 15 minutes realized the 10 mol % TM doped SnO₂ nano powders. Magnetization measurement showed that saturated magnetization M_s at 300K was 6.4×10^-2 - 7.4×10^-1, 5.1×10^-4 and 5.6×10^-4 μ_B/TM-ion for TM=Fe, Ni and Cu. Thus the diluted ferromagnetic semiconductor powder of (TM)_0.1Sn_0.9O₂ with T_c higher than room temperature were successfully prepared by MM, except for V_0.1Sn_0.9O₂.