Electrical control of ferromagnetism in Mn-doped semiconductor heterostructures

Abstract

The interplay of tunneling transport and carrier-mediated ferromagnetism in narrow semiconductor multi-quantum well structures containing layers of GaMnAs is investigated within a self-consistent Green's function approach, accounting for disorder in the Mn--doped regions and unwanted spin-flips at heterointerfaces on phenomenological ground. We find that the magnetization in GaMnAs layers can be controlled by an external electric bias. The underlying mechanism is identified as spin-selective hole tunneling in and out of the Mn-doped quantum wells, whereby the applied bias determines both hole population and spin polarization in these layers. In particular we predict that, near resonance, ferromagnetic order in the Mn doped quantum wells is destroyed. The interplay of both magnetic and transport properties combined with structural design potentially leads to several interrelated physical phenomena, such as dynamic spin filtering, electrical control of magnetization in individual magnetic layers, and, under specific bias conditions, to self-sustained current and magnetization oscillations (magneticmulti-stability). Relevance to recent experimental results is discussed.

10 pages, 8 figures

References in corpus (16)

• Spin Transfer Torques
• Theory of ferromagnetic (III,Mn)V semiconductors
• Visualizing Critical Correlations near the Metal-Insulator Transition in Ga1-xMnxAs
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
• Microscopic analysis of the valence band and impurity band theories of (Ga,Mn)As
• Resonant Tunneling Magneto Resistance in Coupled Quantum Wells
• Theory of digital magneto resistance in ferromagnetic resonant tunneling diodes
• Electric g Tensor Control and Spin Echo of a Hole-Spin Qubit in a Quantum Dot Molecule
• Quantum-level control in a III-V-based ferromagnetic-semiconductor heterostructure with a GaMnAs quantum well and double barriers
• Electronic correlations in short period (CrAs)${}_n$/(GaAs)${}_n$ ferromagnetic heterostructures
• Multiquantum well spin oscillator
• Proposal for a ferromagnetic multiwell spin oscillator
• Optimal control of magnetization dynamics in ferromagnetic heterostructures by spin--polarized currents
• Disorder Enhanced Spin Polarization in Diluted Magnetic Semiconductors
• Magnetoswitching of current oscillations in diluted magnetic semiconductor nanostructures
• Magnetoelectric bistabilities in ferromagnetic resonant tunneling structures

Cited by in corpus (4)

• Resonance Effects in Correlated Multilayer Heterostructures
• Charge transport through interfaces: a tight-binding toy model and its implications
• Theoretical investigation of spin-filtering in CrAs / GaAs heterostructures
• Disorder effects on resonant tunneling transport in GaAs/(Ga,Mn)As heterostructures