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Intrinsic ferromagnetism and anomalous Hall effect in GaN thin film by Mn delta doping
- Source :
- Journal of Alloys and Compounds. 834:154892
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Compound semiconductors doped with magnetically active transition metals (TM) are actively pursued for semiconductor spintronics. Herein we report that delta doping (δ-doping) has been used to incorporate manganese (Mn) into the gallium nitride (GaN) matrix resulting in phase pure highly crystalline heteroepitaxial thin films of (Ga,Mn)N on c-plane sapphire (Al2O3) by plasma-assisted molecular beam epitaxy. Magnetotransport measurements reveal the anomalous Hall effect (AHE) while magnetic measurements show the existence of ferromagnetic ordering. Density functional theory calculations show that δ-doping of Mn atom enables exchange interactions between the Mn 3d states and N 2p states thereby resulting in spin polarized holes in the valence band giving rise to observed AHE and ferromagnetism. This work opens new avenues for incorporating spin polarized carriers in III-nitrides based semiconductors by creating magnetically active Mn layers in heterostructures for spintronics applications.
- Subjects :
- Materials science
Gallium nitride
02 engineering and technology
010402 general chemistry
01 natural sciences
Condensed Matter::Materials Science
chemistry.chemical_compound
Transition metal
Hall effect
Condensed Matter::Superconductivity
Materials Chemistry
Spintronics
Condensed matter physics
Mechanical Engineering
Doping
Metals and Alloys
Heterojunction
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
0104 chemical sciences
Ferromagnetism
chemistry
Mechanics of Materials
Condensed Matter::Strongly Correlated Electrons
0210 nano-technology
Molecular beam epitaxy
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 834
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........734ebfa44f28f44bea77e23a27c42fe8