Low frequency magnetic resonance with a dc SQUID (Superconducting QUantum Interference Device)

Technical Report · Sun Oct 01 00:00:00 EDT 1989

OSTI ID:6723287

Connor, C

Conventional NMR and NQR spectrometers use transistor-based detectors, which are responsive only to voltage. This forces the experimenter to convert the sample magnetization to a voltage, a process that is less efficient at low frequencies when the Faraday induction effect is used. However, the SQUID directly measures the magnetization, so there is no frequency dependent sensitivity to the sample magnetization. Of course, many other devices also measure magnetic field directly, but none has the low frequency sensitivity of the SQUID. Chapter 2 presents the theory required to extend conventional magnetic resonance to z-axis magnetic resonance, a form most efficient for the SQUID. The operating principles of the SQUID, as well as the techniques used to convert the SQUID response into a useful output voltage, are outlined in Chapter 3. The SQUID spectrometer constructed for these experiments is described in Chapter 4. Also in this chapter are a discussion of the design considerations for a SQUID spectrometer, and indications of the overall performance of our instrument. Experimental results on NQR and low frequency NMR are found in Chapters 5 and 6, respectively. 96 refs., 38 figs., 5 tabs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6723287
• Report Number(s): LBL-28544; ON: DE90013357
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
36 MATERIALS SCIENCE
NUCLEAR MAGNETIC RESONANCE
NUCLEAR THEORY
SQUID DEVICES
OPERATION
ANISOTROPY
CERAMICS
DETECTION
ENERGY LEVELS
FREQUENCY ANALYSIS
GLASS
HAMILTONIAN FUNCTION
HYPERFINE STRUCTURE
INTERACTIONS
LAYERS
MEASURING METHODS
NUCLEAR QUADRUPOLE RESONANCE
OSCILLATIONS
RESOLUTION
SOLID STATE PHYSICS
SPIN
TEMPERATURE EFFECTS
USES
ANGULAR MOMENTUM
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
FUNCTIONS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
PARTICLE PROPERTIES
PHYSICS
RESONANCE
SUPERCONDUCTING DEVICES
426001* - Engineering- Superconducting Devices & Circuits- (1990-)
653001 - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models
360603 - Materials- Properties
656000 - Condensed Matter Physics
360204 - Ceramics
Cermets
& Refractories- Physical Properties