Accession Number:

ADA522804

Title:

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

Descriptive Note:

Corporate Author:

ARMY RESEARCH LAB ADELPHI MD

Personal Author(s):

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

Report Date:

2008-02-01

Pagination or Media Count:

6.0

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.

Descriptors:

• *POLARIZATION
• *GALLIUM ARSENIDES
• *NUCLEAR MAGNETIC RESONANCE
• SPIN STATES
• RELAXATION TIME
• MICROSCOPY
• NUCLEAR SPINS
• MAGNETIC RESONANCE

Subject Categories:

• Inorganic Chemistry
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE