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Fiber Bragg Grating Dilatometry in Extreme Magnetic Field and Cryogenic Conditions
Marcelo Jaime1,2, Carolina Corvalán Moya3,4,5,6, Franziska Weickert7
1National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. mjaime@lanl.gov.
Sensors (Basel, Switzerland)
|November 9, 2017
Summary
This study details fiber Bragg grating methods for measuring thermal expansion and magnetostriction in small single-crystalline samples under extreme magnetic fields and cryogenic temperatures. The technique achieves high strain sensitivity, enabling detailed material analysis.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Experimental Techniques
Background:
- Studying material properties under extreme conditions (high magnetic fields, low temperatures) is crucial for fundamental research and technological development.
- Accurate measurement of thermal expansion and magnetostriction in small samples presents significant experimental challenges.
- Existing dilatometry techniques often lack the sensitivity or applicability for extreme environments.
Purpose of the Study:
- To review and present single-mode SiO₂ fiber Bragg grating techniques for dilatometry of small single-crystalline samples.
- To enable precise measurements of thermal expansion and magnetostriction in extreme environments (up to 150 T magnetic fields, <1 K temperatures).
- To analyze and mitigate experimental artifacts affecting measurement accuracy.
Main Methods:
- Utilizing single-mode SiO₂ fiber Bragg gratings for high-sensitivity strain measurement.
- Developing experimental strategies for dilatometry on millimeter-long samples (metallic, insulating, radioactive).
- Quantitative analysis of experimental artifacts including temperature-dependent refractive index, magnetic field polarization rotation, and strain transfer efficiency.
Main Results:
- Demonstration of a dilatometry technique with strain sensitivity as low as ≈10⁻⁸.
- Successful measurement of thermal expansion and magnetostriction in various material types under extreme conditions.
- Quantitative assessment of artifacts and comparison with analytical models for small samples.
Conclusions:
- Fiber Bragg grating techniques are effective for dilatometry in extreme magnetic fields and cryogenic temperatures.
- The developed methods allow for high-precision characterization of small single-crystalline samples.
- Understanding and accounting for experimental artifacts are critical for accurate results in extreme environment measurements.
