Polymer-assisted deposition and room-temperature ferromagnetism of amorphous Mn-doped gallium oxide films. (November 2022)

• Record Type: Journal Article
• Authors: Dai, Xu; Zhang, Xi; Xiang, Gang
• Is Part Of: Scripta materialia. Number 220(2022)
• Publication Date: 2022-11
• Subjects: Amorphous gallium oxide -- Magnetic semiconductor -- Polymer-assisted deposition -- Oxygen vacancies -- Ferromagnetism; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114919
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this work, amorphous Mn-doped gallium oxide ( a -GMO) films are prepared by polymer-assisted deposition. The a -GMO films exhibit room-temperature ferromagnetism (RTFM) and their saturation magnetization ( MS ) and coercive field ( HC ) values are dependent on the Mn concentration. Interestingly, a lower Mn-doping concentration (3.1%) is sufficient to trigger the RTFM in the a -GMO films, in comparison with the previously-reported values in crystalline Mn-doped β-Ga2 O3 (11%) and γ-Ga2 O3 (7.0%). Furthermore, the a -GMO films exhibit higher MS values than those crystalline Mn-doped Ga2 O3 films at the medium doping levels between 10% and 20%. Further analysis shows that the enhancement of the ferromagnetism comes from the strong coupling between abundant oxygen vacancies (VO s) and Mn ions in the a -GMO films. Our results give insight to the RTFM of the a -GMO films and may be useful for the design, fabrication and application of spintronic materials based on gallium oxide.