Spin Polarization Contrast Observed in GaAs by Force-Detected Nuclear Magnetic Resonance

Abstract

We applied the recently developed technique of force-detected nuclear magnetic resonance (NMR) to observe 71Ga, 69Ga, and 75As in GaAs. The nuclear spin-lattice relaxation time is 21 5 min for 69Ga at 5 K and 4.6 Tesla. We have exploited this long relaxation time to first create and then observe spatially varying nuclear spin polarization within the sample, demonstrating a new form of contrast for magnetic resonance force microscopy (MRFM). Such nuclear spin contrast could be used to indirectly image electron spin polarization in GaAs-based spintronic devices.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2008
Accession Number
ADA522804

Entities

People

  • Doran D. Smith
  • Kent R. Thurber
  • Lee E Harrell
  • Raul Fainchtein

Organizations

  • United States Army Research Laboratory

Tags

DTIC Thesaurus Topics

  • Contrast
  • Detection
  • Frequency
  • Frequency Modulation
  • Magnetic Fields
  • Magnetic Moments
  • Magnetic Resonance
  • Magnetic Resonance Imaging
  • Materials
  • Military Research
  • Nuclear Magnetic Resonance
  • Nuclear Spins
  • Physics Laboratories
  • Polarization
  • Quantum Properties
  • Relaxation Time
  • Resonance

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Medical Imaging.
  • Semiconductor Device Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene