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Related Experiment Video

Updated: May 21, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

Gate-controlled spin injection at LaAlO3/SrTiO3 interfaces.

N Reyren1, M Bibes, E Lesne

  • 1Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France.

Physical Review Letters
|June 12, 2012
PubMed
Summary
This summary is machine-generated.

We demonstrate electrical spin injection in a high-mobility two-dimensional electron system at the LaAlO3/SrTiO3 interface. Spin accumulation signals are amplified by resonant tunneling through localized states, enhancing spin injection efficiency.

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Last Updated: May 21, 2026

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • The LaAlO3/SrTiO3 interface hosts a high-mobility quasi-two-dimensional electron system (2-DES).
  • Understanding spin dynamics in such systems is crucial for developing spintronic devices.

Purpose of the Study:

  • To investigate electrical spin injection and accumulation in the 2-DES at the LaAlO3/SrTiO3 interface.
  • To analyze the influence of magnetic fields and electrical biases on spin signals.

Main Methods:

  • Utilizing a nonlocal, three-terminal measurement geometry.
  • Applying perpendicular and transverse magnetic fields to induce Hanle and inverted Hanle effects.
  • Modulating bias and back-gate voltages to study spin accumulation variations.

Main Results:

  • Successfully achieved electrical spin injection into the 2-DES.
  • Observed voltage variations linked to spin precession under magnetic fields.
  • Demonstrated signal amplification via resonant tunneling through localized states in LaAlO3.

Conclusions:

  • Electrical spin injection is feasible at the LaAlO3/SrTiO3 interface.
  • Resonant tunneling significantly enhances spin accumulation signals.
  • This work provides insights into spin transport mechanisms in oxide heterostructures.