Ferromagnetism in undoped ZnO grown by pulsed laser deposition
Abstract
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.
- Publication:
-
Materials Research Express
- Pub Date:
- May 2020
- DOI:
- 10.1088/2053-1591/ab8c71
- Bibcode:
- 2020MRE.....7e6102A
- Keywords:
-
- ferromagnetism;
- ZnO;
- positron annihilation spectroscopy;
- vacancy cluster;
- x-ray diffraction