Electrical spin injection in modulation-doped GaAs from an in situ grown Fe/MgO layer
- Electrical spin injection in modulation-doped GaAs from an in situ grown Fe/MgO layer
- 심성훈; 김형준; 구현철; 이윤희; 장준연
- spin injection; modulation doping; in situ grown Fe/MgO; 3therminal Hanle curve
- Issue Date
- Applied physics letters
- VOL 107, NO 10, 102407-1-102407-5
- We study spin accumulation in n-doped GaAs that were electrically injected from Fe via MgO
using three-terminal Hanle measurement. The Fe/MgO/GaAs structures were prepared in a cluster molecular beam epitaxy that did not require the breaking of the vacuum. We found the crystal orientation relationship of epitaxial structures Fe//MgO//GaAs without evident defects at the interface. Control of depletion width and interface resistance by means of modulation doping improves spin injection, leading to enhanced spin voltage (DV) of 6.3mV at 10K and 0.8mV even at 400 K. The extracted spin lifetime and spin diffusion length of GaAs are 220 ps and 0.77 lm, respectively, at 200 K. MgO tunnel barrier grown in situ with modulation doping at the interface appears to be promising for spin injection into GaAs. VC 2015 AIP Publishing LLC.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.