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Exchange bias driven by Dzyaloshinskii-Moriya interactions
R Yanes1, J Jackson, L Udvardi
1Department of Physics, University of Konstanz, Konstanz, D-78457, Germany.
Physical Review Letters
|December 10, 2013
Summary
Exchange bias in IrMn3/Co(111) systems is driven by Dzyaloshinskii-Moriya interactions, enhancing coercivity through a spin-flop mechanism. This study uses multiscale modeling to understand perpendicular exchange bias.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Exchange bias is a crucial phenomenon in spintronics, enabling magnetic memory devices.
- Compensated thin-film systems like IrMn3/Co(111) are key for understanding interfacial magnetic effects.
- Multiscale modeling offers a powerful approach to investigate complex magnetic phenomena.
Purpose of the Study:
- To investigate the exchange bias effect in a compensated IrMn3/Co(111) system.
- To elucidate the origins of perpendicular exchange bias and coercivity enhancement.
- To utilize multiscale modeling, bridging ab initio and atomistic spin models.
Main Methods:
- Multiscale modeling combining ab initio and atomistic spin models.
- Numerical evaluation of out-of-plane hysteresis loops for varying ferromagnetic layer thicknesses.
- Analysis of interfacial exchange interaction contributions to identify bias origins.
Main Results:
- Observation of perpendicular exchange bias in the IrMn3/Co(111) system.
- Significant enhancement of system coercivity.
- Identification of Dzyaloshinskii-Moriya interactions as the primary source of exchange bias.
- Attribution of coercivity increase mainly to a spin-flop mechanism.
Conclusions:
- Dzyaloshinskii-Moriya interactions are the dominant mechanism for exchange bias in this system.
- Spin-flop transitions are responsible for the observed coercivity enhancement.
- Multiscale modeling provides valuable insights into the fundamental mechanisms governing exchange bias.
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