Electrical detection of coherent spin precession using the ballistic intrinsic spin Hall effect
- Electrical detection of coherent spin precession using the ballistic intrinsic spin Hall effect
- 최원영; 김형준; 장준연; 한석희; 구현철; 마크 존슨
- spin Hall effect; Rashba effect
- Issue Date
- Nature nanotechnology
- VOL 10, NO 8, 666-670
- The spin–orbit interaction in two-dimensional electron systems provides an exceptionally rich area of research. Coherent spin precession in a Rashba effective magnetic field1,2 in the channel of a spin field-effect transistor3,4 and the spin Hall effect5–7 are the two most compelling topics in this area. Here, we combine these effects to provide a direct demonstration of the ballistic intrinsic spin Hall effect8 and to demonstrate a technique for an all-electric measurement of the Datta–Das3 conductance oscillation, that is, the oscillation in the source–drain conductance due to spin precession. Our hybrid device has a ferromagnet electrode as a spin injector and a spin Hall detector. Results from multiple devices with different channel lengths map out two full wavelengths of the Datta–Das oscillation. We also use the original Datta– Das technique with a single device of fixed length and measure the channel conductance as the gate voltage is varied. Our experiments show that the ballistic spin Hall effect can be used for efficient injection or detection of spin polarized electrons, thereby enabling the development of an
integrated spin transistor.
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