AVS 57th International Symposium & Exhibition
    Electronic Materials and Processing Tuesday Sessions
       Session EM-TuP

Paper EM-TuP8
Synthesis and Magnetic Properties of Zn1-xMnxO Hollow Nanospheres

Tuesday, October 19, 2010, 6:00 pm, Room Southwest Exhibit Hall

Session: Electronic Materials and Processing Poster Session
Presenter: D.R. Liu, National Applied Research Laboratories, Taiwan
Authors: D.R. Liu, National Applied Research Laboratories, Taiwan
T.C. Wu, National Applied Research Laboratories, Taiwan
Y.C. Yeh, National Applied Research Laboratories, Taiwan
W.H. Cho, National Applied Research Laboratories, Taiwan
Correspondent: Click to Email
ZnMnO is one of the most promising diluted magnetic semiconductors (DMS) materials due to its predicted above room temperature ferromagnetism. In this study, Al2O3 layer was conformally deposited on the surface of polystyrene (PS) nanoshpere with different diameter (100nm~800nm) by atomic layer deposition (ALD). After removal of PS nanosphere by heating, Al2O3 hollow nanospheres were formed. Then the Zn1-xMnxO ( x=0.03, 0.05, 0.07) coatings were grown on Al2O3 hollow nanospheres by pulsed laser deposition(PLD). According to the results of high-resolution x-ray diffraction, the Zn1-xMnxO hollow nanospheres are polycrystalline with a preferential growth direction of (002). The surface and cross-section morphologies of the hollow nanospheres were analyzed using a field-emission scanning electron microscope (FE-SEM). Photoluminescence spectra in applied magnetic field demonstrate ultraviolet emission peaks which have shift with the increase of Mn ion concentration. The magnetic properties of the nanospheres were measured by a superconducting quantum interference device (SQUID) magnetometer and x-ray magnetic circular dichroism (XMCD) spectroscopy. The results show the magnetic properties of Zn1-xMnxO hollow nanospheres strongly depend on the Mn composition fraction and the size of nanospheres.