AVS 60th International Symposium and Exhibition
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuP

Paper MI-TuP1
Synthesis and Characterization of Zn1-xCoxO/ZnO Hollow Nanosphere Structures

Tuesday, October 29, 2013, 6:00 pm, Room Hall B

Session: Magnetic Interfaces and Nanostructures Poster Session
Presenter: D.R. Liu, ITRC, NARL, Taiwan, Republic of China
Authors: D.R. Liu, ITRC, NARL, Taiwan, Republic of China
W.-H. Cho, ITRC, NARL, Taiwan, Republic of China
C.J. Weng, ITRC, NARL, Taiwan, Republic of China
Correspondent: Click to Email
Diluted magnetic semiconductors (DMS) have recently attracted considerable attention due to their potential applications for spintronic devices, such as spin-valve transistors, nonvolatile memory, and magneto-optical switches. ZnCoO is one of the most promising diluted magnetic semiconductors materials due to its high temperature ferromagnetism. In this study, ZnO 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, ZnO hollow nanospheres were formed. Then the Zn1-xCoxO (x=0~0.1) coatings were grown on ZnO hollow nanospheres by pulsed laser deposition(PLD). According to the results of high-resolution x-ray diffraction, the Zn1-xCoxO/ZnO 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). The magnetic properties of the nanospheres were measured by a vibrating sample magnetometer(VSM) and x-ray magnetic circular dichroism (XMCD) spectroscopy. The results show the magnetic properties of Zn1-xCoxO/ZnO hollow nanospheres strongly depend on the Co composition fraction and the size of nanospheres.