Exchange-bias reversal in Mn 2−x Ni 1+x Ga films with antisite disorder
- Resource Type
- Authors
- D. H. Mosca; A. J. A. de Oliveira; P.C. de Camargo; D.M. Schaefer; W. H. Schreiner; J. Varalda
- Source
- Intermetallics. 91:22-30
- Subject
- Materials science
Condensed matter physics
Magnetic moment
Mechanical Engineering
Metals and Alloys
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Moment (mathematics)
Tetragonal crystal system
Exchange bias
Mechanics of Materials
Ferrimagnetism
0103 physical sciences
Materials Chemistry
Density functional theory
Thin film
010306 general physics
0210 nano-technology
Molecular beam epitaxy
- Language
- ISSN
- 0966-9795
We report on the exchange-bias reversal in Mn2−xNi1+xGa (x = 0, 0.2, 0.4, and 0.6) thin films grown by molecular beam epitaxy on GaAs substrates. Exchange bias reversal is observed in these intrinsically ferrimagnetic films together with a reduction in the total moment even under increasing of Ni content which usually increases the total moment. These magnetic features indicate that antisite disorder is responsible for engender changes in the exchange-bias and total moment. Density functional theory calculations were performed to determine the magnetic moment dependence with the volume of cubic austenite and tetragonal martensite structures. A simple phenomenological approach is used to extract an effective exchange coupling constant from exchange bias fields.