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Title: A 4 K cryogenic probe for use in magnetic resonance force microscopy experiments

The detailed design of a mechanically detected nuclear magnetic resonance probe using the SPAM (Springiness Preservation by Aligning Magnetization) geometry, operating at 4 K, in vacuum, and a several-Tesla magnetic field is described. The probe head is vibration-isolated well enough from the environment by a three-spring suspension system that the cantilever achieves thermal equilibrium with the environment without the aid of eddy current damping. The probe uses an ultra-soft Si cantilever with a Ni sphere attached to its tip, and magnetic resonance is registered as a change in the resonant frequency of the driven cantilever. The RF system uses frequency sweeps for adiabatic rapid passage using a 500 μm diameter RF coil wound around a sapphire rod. The RF coil and optical fiber of the interferometer used to sense the cantilever's position are both located with respect to the cantilever using a Garbini micropositioner, and the sample stage is mounted on an Attocube nanopositioner.
Authors:
;  [1] ;  [2]
  1. U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783 (United States)
  2. Mechanical Engineering, University of Washington, Seattle, Washington 98195 (United States)
Publication Date:
OSTI Identifier:
22220357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 9; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CRYOGENICS; DAMPING; DESIGN; EDDY CURRENTS; ELECTRON PROBES; INTERFEROMETERS; MAGNETIC FIELDS; MAGNETIZATION; MICROSCOPY; NMR SPECTROMETERS; NUCLEAR MAGNETIC RESONANCE; OPTICAL FIBERS; RF SYSTEMS; SAPPHIRE; SENSORS; THERMAL EQUILIBRIUM