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Hanle spin precession in a two-dimensional electron system
- Publication Year :
- 2017
- Publisher :
- AMER PHYSICAL SOC, 2017.
-
Abstract
- We investigate the nonlocal Hanle effect in high mobility two-dimensional electron systems using (Ga,Mn)As/GaAs spin Esaki diodes as spin selective contacts. Spin signals in these systems can be strongly affected by dynamic nuclear polarization, which mimics long spin-relaxation times extracted from the measured Hanle curves. Here, we introduce a method which largely suppresses these effects by using an ac injection-detection setup. This allows us to extract from the measurements realistic spin lifetimes on the order of single nanoseconds. As the detection of Hanle signals is also strongly affected by offset signals we discuss the magnetic field dependence of these background voltages observed in lateral nonlocal spin injection devices. We show how the strength of the background magnetoresistance can be minimized by choosing a proper device geometry.
- Subjects :
- Hanle effect
Physics
RELAXATION ANISOTROPY
ROOM-TEMPERATURE
INJECTION
POLARIZATION
SPINTRONICS
SILICON
SEMICONDUCTORS
TRANSPORT
CURRENTS
VALVE
Spintronics
Magnetoresistance
Spin polarization
Condensed matter physics
ddc:530
02 engineering and technology
Electron
021001 nanoscience & nanotechnology
Polarization (waves)
530 Physik
01 natural sciences
Magnetic field
0103 physical sciences
010306 general physics
0210 nano-technology
Diode
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....0e1b0498b7acfc102e5fc02808e88960