Observation of Negative Magnetic Hysteresis Loop in ZnO Thin Films. (10th June 2018)

• Record Type: Journal Article
• Authors: Haseman, Micah; Saadatkia, Pooneh; Winarski, David; Hernandez, Armando; Kusz, Matt; Anwand, Wolfgang; Wagner, Andreas; Thapa, Sunil; Colosimo, A. M.; Selim, Farida A.
• Other Names: Culea Eugen Academic Editor.
• Is Part Of: Journal of spectroscopy. Volume 2018(2018)
• Publication Date: 2018-06-10
• Subjects: Spectrum analysis -- Periodicals; 543.505
• DOI: 10.1155/2018/3575917
• Languages: English
• ISSNs: 2314-4920

Abstract

Abstract : We report on the observation of an unusual negative magnetic hysteresis loop in ZnO thin film codoped 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.