Conference proceeding
Tuning the dynamic exchange interaction in ferromagnet/semiconductor heterostructures
Spintronics VIII, Vol.9551, pp.95510E-95510E-10
Proceedings of SPIE
01/01/2015
DOI: 10.1117/12.2188800
Abstract
We investigate the impact of tunnel barrier thickness on electron spin dynamics in Fe/MgO/GaAs heterostructures using spin-resolved optical pump-probe spectroscopy. Comparison of the Larmor frequency between thick and thin MgO barriers reveals a four-fold variation in exchange coupling strength, and investigation of the inhomogeneous dephasing time, T-2*, argues that inhomogeneity in the local effective hyperfine field dominates free-carrier spin relaxation across the entire range of barrier thickness. These results provide additional evidence to support the theory of hyperfine-dominated spin relaxation in GaAs at low temperature and in the presence of an externally applied magnetic field. Further, this work lays the foundation for engineering both the exchange coupling and the free carrier spin dynamics in ferromagnet/semiconductor heterostructures, allowing for the exploration of dissipation and transport in the regime of dynamically-driven spin pumping.
Details
- Title: Subtitle
- Tuning the dynamic exchange interaction in ferromagnet/semiconductor heterostructures
- Creators
- Yu-Sheng Ou - The Ohio State UniversityYi-Hsin Chiu - The Ohio State UniversityN. J. Harmon - University of IowaPatrick Odenthal - University of California, RiversideMatthew Sheffield - The Ohio State UniversityMichael Chilcote - The Ohio State UniversityR. K. Kawakami - The Ohio State UniversityM. E. Flatte - University of IowaE. Johnston-Halperin - The Ohio State University
- Contributors
- H J Drouhin (Editor)J E Wegrowe (Editor)M Razeghi (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- Spintronics VIII, Vol.9551, pp.95510E-95510E-10
- Publisher
- Spie-Int Soc Optical Engineering
- Series
- Proceedings of SPIE
- DOI
- 10.1117/12.2188800
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Number of pages
- 10
- Language
- English
- Date published
- 01/01/2015
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984428813602771
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