Observation of Negative Magnetic Hysteresis Loop in ZnO Thin Films
Observation of Negative Magnetic Hysteresis Loop in ZnO Thin Films
Haseman, M.; Winarksi, D.; Saadatkia, P.; Hernandez, A.; Kusz, M.; Anwand, W.; Wagner, A.; Thapa, S.; Colosimo, A. M.; Selim, F. A.
Abstract
We report on the observation of an unusual negative magnetic hysteresis loop in ZnO thin film co-doped with cobalt and aluminum (Co-Al:ZnO), while other transition-metal doped ZnO films such as Cu-doped ZnO and Mn-doped ZnO, exhibit normal hysteresis loops. The unusual magnetic behavior is ascribed to the presence of double magnetic layers with different magnetic moments due to the change of structural defects across the film layers. Positron annihilation measurements confirmed the presence of unique microstructural changes in the Co-Al:ZnO film. This study shows that defects in diluted magnetic semiconductors may induce not only ferromagnetism but also novel magnetic behaviors.
Keywords: magnetism ZnO hysteresis
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
- P-ELBE
Related publications
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 24889) publication
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Journal of Spectroscopy (2018), 3575917
DOI: 10.1155/2018/3575917
Cited 2 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-24889