Dynamical Nuclear Polarization by Electrical Spin Injection in Ferromagnet-Semiconductor Heterostructures

Abstract

Electrical spin injection from Fe into Al${}_x$Ga${}_{1-x}$As quantum well heterostructures is demonstrated in small (< 500 Oe) in-plane magnetic fields. The measurement is sensitive only to the component of the spin that precesses about the internal magnetic field in the semiconductor. This field is much larger than the applied field and depends strongly on the injection current density. Details of the observed hysteresis in the spin injection signal are reproduced in a model that incorporates the magnetocrystalline anisotropy of the epitaxial Fe film, spin relaxation in the semiconductor, and the dynamical polarization of nuclei by the injected spins.

5 pages, 3 figures

References in corpus (5)

• Efficient Electrical Spin Injection from a Magnetic Metal / Tunnel Barrier Contact into a Semiconductor
• Electrical Spin Injection in a Ferromagnetic / Tunnel Barrier/ Semiconductor Heterostructure
• Origin of enhanced dynamic nuclear polarization and all-optical nuclear magnetic resonance in GaAs quantum wells
• Spontaneous Spin Coherence in n-GaAs Produced by Ferromagnetic Proximity Polarization
• Ferromagnetic imprinting of spin polarization in a semiconductor

Cited by in corpus (20)

• Spintronics: Fundamentals and applications
• Spin dynamics in semiconductors
• Spin precession and inverted Hanle effect in a semiconductor near a finite-roughness ferromagnetic interface
• Spin injection from the Heusler alloy Co_2MnGe into Al_0.1Ga_0.9As/GaAs heterostructures
• Spin Injection and Relaxation in Ferromagnet-Semiconductor Heterostructures
• Spin accumulation in forward-biased MnAs/GaAs Schottky diodes
• Electron spin-phonon interaction symmetries and tunable spin relaxation in silicon and germanium
• Signatures of dynamically polarized nuclear spins in all-electrical lateral spin transport devices
• Electron Spin Dynamics and Hyperfine Interactions in Fe/Al_0.1Ga_0.9As/GaAs Spin Injection Heterostructures
• Spin diffusion/transport in $n$-type GaAs quantum wells
• Breakdown of the Korringa Law of Nuclear Spin Relaxation in Metallic GaAs
• Nuclear Magnetic Resonance in a Ferromagnet-Semiconductor Heterostructure
• Spin blockade at semiconductor/ferromagnet junctions
• Nuclear Spin Dynamics in Parabolic Quantum Wells
• Nuclear Polarization in Quantum Point Contacts in an In-Plane Magnetic Field
• Electronic structure of nuclear-spin-polarization-induced quantum dots
• Bias current dependence of the spin lifetime in insulating Al${}_{0.3}$Ga${}_{0.7}$As
• Probing current-induced magnetic fields in Au|YIG heterostructure with low-energy muon spectroscopy
• Spin-orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions
• Electrical expression of spin accumulation in ferromagnet/semiconductor structures