Production of bulk dilute ferromagnetic semiconductor by mechanical milling

We tried to prepare the bulk dilute ferromagnetic semiconductor (DMS) by mechanical milling (MM). Experimental results were as following: (1) The observation of X-ray diffraction and transmitting electron microscopy showed that the particle diameter of host ZnO powder were reduced to about 10 nm by MM. (2) The MM for the mixtures of V₂O₅/ZnO or γ-Fe₂O₃/ZnO realizes the V- or Fe-doped ZnO nano-powders. (3) The values of magnetization under the field of 5 kOe were nearly saturated to 0.8×10^-3 to 3×10^-3 μ_B/V-ion for V_xZn_1-xO (x=0.05, 0.1 and 0.2), and 0.2-0.3 μ_B/Fe-ion for Fe_xZn_1-xO (x=0.05 and 0.1) at room temperature. The above results show that the ferromagnetic DMS powder of V_xZn_1-xO and Fe_xZn_1-xO were successfully prepared by MM method.