Structural and magnetic properties in Mn-doped ZnO films prepared by pulsed-laser deposition

摘要

We investigated the structural and magnetic properties of Zn_(0.95)Mn_(0.05)O films prepared on sapphire substrates by pulsed-laser deposition. Only low temperature ferromagnetism (Curie temperature lower than 50 K) was observed in Mn-doped samples, while pure ZnO film shows a typical paramagnetic behavior. Structural analyses indicate that the substitutional Mn~(2+) ions play a significant role for the low temperature ferromagnetism. Lattice defects such as V_0 and V_(ZN) were not proven to be effective factors for the origin of ferromagnetism in the films. The low temperature ferromagnetism might be interpreted as p-d hybridization from indirect coupling of Mn ions (Mn-O-Mn).