Ferromagnetism in Undoped ZnO Grown by Pulsed Laser Deposition


Ferromagnetism in Undoped ZnO Grown by Pulsed Laser Deposition

Waqar, A.; Cai-Qin, L.; Xu, C.; Zhou, S.; Wagner, A.; Butterling, M.; Muhammad, Y.; Francis, C.-C. L.

Undoped ZnO films grown on sapphire by pulsed laser deposition are magnetic at room temperature. A comprehensive study involving x-ray diffraction, positron annihilation spectroscopy, and superconducting quantum Interference device-vibrating sample magnetometer is performed to study the origin of the observed magnetization. Correlations between the saturation magnetization, VZn-2VO concentration and surface to volume ratio of the grain found experimentally show that the magnetization is associated with the vacancy cluster and probably VZn-2VO residing on the grain surface.

Keywords: ZnO films; pulsed laser deposition; magnetic x-ray diffraction; positron annihilation spectroscopy; magnetization vacancy; cluster grain surface

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Publ.-Id: 30912