AVS 63rd International Symposium & Exhibition
    Electronic Materials and Photonics Thursday Sessions
       Session EM-ThP

Paper EM-ThP4
Optical and Magneto-Optical Properties of ZnO/Zn1-xCoxO Thin Films Grown by Pulsed Laser Deposition

Thursday, November 10, 2016, 6:00 pm, Room Hall D

Session: EMPD Poster Session
Presenter: Da-Ren Liu, Instrument Technology Research Center, National Applied Research Laboratories
Authors: D.R. Liu, Instrument Technology Research Center, National Applied Research Laboratories
C.J. Weng, Instrument Technology Research Center, National Applied Research Laboratories
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 DMS materials due to its predicted above room temperature ferromagnetism. In this study, ZnO layer was conformally deposited on the Si substrates by atomic layer deposition (ALD). Then the Zn1-xCoxO (0.01 < x < 0.10) coatings were grown on ZnO layer by Nd:YAG pulsed laser deposition (PLD). The thickness and roughness of the films were characterized by grazing-incidence x-ray reflectivity (GIXR). According to the results of high-resolution x-ray diffraction, the ZnO/ Zn1-xCoxO thin films are polycrystalline with a preferential growth direction of (002). Photoluminescence spectra demonstrate ultraviolet emission peaks which have shift with the increase of Co ion concentration. The temperature-dependent magnetization (M-T) curves of the ZnO/ Zn1-xCoxO thin films were measured by a superconducting quantum interference device (SQUID) magnetometer and the magneto-optical properties were measured by micro-MOKE spectroscopy. The results show the room temperature ferromagnetism of the ZnO/ Zn1-xCoxO thin films suggested that the possibility for the application to diluted magnetic semiconductors.