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Updated: Oct 10, 2025
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
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Magnetoelastic standing waves induced in UO2 by microsecond magnetic field pulses
Rico Schönemann1, George Rodriguez2, Dwight Rickel3
1Materials Physics and Applications-National High Magnetic Field Laboratory, Pulse Field Facility, Los Alamos National Laboratory, Los Alamos, NM 87545; rschoenemann@lanl.gov mjaime@lanl.gov.
Summary
Researchers studied the piezomagnetic antiferromagnet UO2 using magnetoelastic dilatometry. They observed mechanical resonances and a phase shift in lattice oscillations, revealing insights into its magnetic and elastic properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Uranium dioxide (UO2) exhibits complex magnetic and elastic behaviors.
- Understanding magnetoelastic coupling is crucial for advanced materials.
- Piezomagnetic antiferromagnets present unique responses to external magnetic fields.
Purpose of the Study:
- To investigate the magnetoelastic dilatometry of UO2.
- To probe mechanical resonances and lattice dynamics under extreme magnetic fields.
- To elucidate the role of the antiferromagnetic order parameter in UO2's response.
Main Methods:
- Magnetoelastic dilatometry using the fiber Bragg grating method.
- Application of high pulsed magnetic fields up to 150 T.
- Measurements conducted across a temperature range of 10-300 K.
Main Results:
- Excitation of mechanical resonances in UO2 on microsecond timescales.
- Observation of resonances in both paramagnetic and antiferromagnetic states.
- A distinct π phase shift in lattice oscillations above the piezomagnetic switch field (Hc).
Conclusions:
- Strong magnetoelastic coupling and high crystal quality drive the observed resonances in UO2.
- The π phase shift is attributed to the reversal of the antiferromagnetic order parameter.
- Results provide fundamental insights into the piezomagnetic properties of UO2.
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