d(0) Ferromagnetism in undoped ZnO thin films: Effect of thickness, interface and oxygen annealing

作者：Mal Siddhartha^*; Yang Tsung Han; Jin Chunming; Nori Sudhakar; Narayan J; Prater J T

来源：Scripta Materialia, 2011, 65(12): 1061-1064.

DOI：10.1016/j.scriptamat.2011.09.016

• Magnetic thin films
• Laser deposition
• Annealing
• Resistivity and conductivity
• Interfaces

We present a systematic study of the thickness dependency of the structural, electrical and magnetic properties of undoped ZnO thin films. The highest saturation moment (similar to 36.75 emu cm(-3)) was observed for the thinnest films. Both the undoped and 5% Co doped ZnO films of different thickness (0.066-1.1 mu m) showed a diamagnetic behavior upon annealing in oxygen. Activation energy of quenching of ferromagnetism revealed oxygen vacancies as the key mediating defect in ferromagnetic ZnO thin films.

• 出版日期2011-12