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Drift and diffusion of spins generated by the spin Hall effect
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/content/aip/journal/apl/91/6/10.1063/1.2768633
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Image of FIG. 1.

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FIG. 1.

(Color) (a) Schematic of the -wide channel with a transverse arm. The origin is defined to be at the center of the arm along and at the center of the main channel along (red dot). The dotted lines represent the path of position scans. (b) for away from the transverse arm . The inset shows the spin coherence time extracted by assuming a Hanle model Lorentzian line shape. (c) taken away from the transverse arm for and (black circles), (blue triangles), and (magenta squares). (d) Characteristic data from the center of the transverse arm. The line is a guide to the eye.

Image of FIG. 2.

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FIG. 2.

(Color) (a) Normalized near the channel edge (black circles), from the edge (blue triangles), and from the edge (magenta squares). The corresponding lines are calculations from the diffusion model. (b) and used in the model calculations. is obtained from scans near the channel edge, while comes from measurements on a Hall bar. (c) Data are an image of along the main channel width showing the narrowing central peak away from the channel edge and the sign change away from the central peak. The lower panel shows model calculations of . (d) Data are an image of at in the transverse arm showing the complicated spin accumulation profile. The lower panel shows diffusion model calculations of .

Image of FIG. 3.

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FIG. 3.

(Color) Images of and calculated in the transverse arm. The top panels are data and the bottom panels are model calculations. The electric field in the channel has a magnitude along and is applied as (a) a square wave, (b) an offset square wave between 0 and , and (c) an offset square wave between 0 and . Data are normalized to the peak values in (a).

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/content/aip/journal/apl/91/6/10.1063/1.2768633
2007-08-08
2014-04-16

Abstract

Electrically generated spin accumulation due to the spin Hall effect is imaged in channels using Kerr rotation microscopy, focusing on its spatial distribution and time-averaged behavior in a magnetic field.Spatially resolved imaging reveals that spin accumulation observed in transverse arms develops due to the longitudinal drift of spin polarization produced at the sample boundaries. One- and two-dimensional drift-diffusion modeling is used to explain these features, providing a more complete understanding of observations of spin accumulation and the spin Hall effect.

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Scitation: Drift and diffusion of spins generated by the spin Hall effect
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/6/10.1063/1.2768633
10.1063/1.2768633
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