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Updated: Jul 13, 2026

Fabrication and Operation of a Nano-Optical Conveyor Belt

Fabrication and Operation of a Nano-Optical Conveyor Belt

Published on: August 26, 2015

Imaging spin transport in lateral ferromagnet/semiconductor structures.

S A Crooker¹, M Furis, X Lou

¹National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. crooker@lanl.gov

Science (New York, N.Y.)

|October 1, 2005

Summary

This summary is machine-generated.

Researchers directly imaged spin injection and accumulation in gallium arsenide devices. They observed spin polarization flowing against electron current, showing spin accumulation via reflection from ferromagnetic contacts.

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Lateral spin-transport devices utilize ferromagnetic contacts for spin injection and detection.
Understanding spin dynamics, particularly spin accumulation and transport, is crucial for spintronic applications.

Purpose of the Study:

To directly image electrical spin injection and accumulation in gallium arsenide (GaAs) channels.
To investigate the behavior and origin of spin accumulation near ferromagnetic drain contacts.
To explore the modulation of electrical conductance by controlling spin orientation.

Main Methods:

Direct imaging of spin injection and accumulation in lateral spin-transport devices.
Utilized ferromagnetic source and drain tunnel-barrier contacts.
Optical injection of spin-polarized electrons.

Main Results:

Observed emission of spins from the source and imaged a region of spin accumulation near the drain.
Injected and accumulated spins exhibited the same orientation, antiparallel to the contact magnetization.
Demonstrated that accumulated spin polarization flows away from the drain, against the net electron current, indicating spin polarization by reflection.

Conclusions:

Direct imaging provides unprecedented insight into spin dynamics in lateral devices.
Spin accumulation arises from reflection at the ferromagnetic drain contact.
Electrical conductance is controllable by manipulating spin orientation, paving the way for novel spintronic devices.