Related Experiment Videos
Carrier-induced magnetic ordering control in a digital (Ga,Mn)as structure
Jisang Hong1, Ding-Sheng Wang, R Q Wu
1Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Physical Review Letters
|May 21, 2005
Summary
External holes induce magnetic switching in (Ga,Mn)As heterostructures, enabling separate control over Curie temperature (Tc) and magnetization reversal. Electrons have minimal impact on this magnetic behavior.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Digital (Ga,Mn)As heterostructures are promising for spintronic applications.
- Understanding carrier-induced magnetism is crucial for device design.
Purpose of the Study:
- To theoretically investigate carrier-induced magnetization reversal in (Ga,Mn)As heterostructures.
- To explore the influence of Mn-Mn layer distance and carrier type/concentration.
- To demonstrate independent control of Curie temperature (Tc) and magnetic reversal.
Main Methods:
- Utilized the full potential linearized augmented plane wave (FP-LAPW) method for theoretical calculations.
- Simulated heterostructures with varying Mn-Mn distances (d(Mn-Mn)).
- Analyzed the effects of external hole and electron concentrations.
Main Results:
- External holes induced a transition from antiferromagnetic to ferromagnetic states at d(Mn-Mn) = 16.96 Å.
- Electron injection showed no significant effect on the magnetic state.
- Achieved separate control over Tc and magnetic reversal characteristics.
Conclusions:
- Carrier type plays a critical role in magnetization reversal in (Ga,Mn)As.
- Digital (Ga,Mn)As alloys offer tunable magnetic properties.
- This research paves the way for novel spintronic device functionalities.