Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures
Yuki Shiomi1, Hidetoshi Masuda2,3, Hidefumi Takahashi4
1Department of Basic Science, University of Tokyo, Meguro, Tokyo, 153-8902, Japan. yukishiomi@g.ecc.u-tokyo.ac.jp.
Scientific Reports
|May 7, 2020
Summary
The magneto-piezoelectric effect (MPE) in EuMnBi2 is enhanced at low temperatures, reaching maximum strain in its antiferromagnetic states. This discovery offers potential for new lead-free piezoelectric materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Physics
Background:
- Magneto-piezoelectric effect (MPE) involves strain generation in magnetic metals lacking specific symmetries.
- Previous MPE studies in EuMnBi2 were limited to 77 K, hindering comprehensive analysis.
Purpose of the Study:
- Extend MPE measurements in EuMnBi2 to lower temperatures (liquid helium range).
- Investigate MPE dependencies on laser position, electric current parameters, and temperature.
- Explore potential for novel lead-free piezoelectric materials.
Main Methods:
- Experimental measurement of MPE in EuMnBi2 at cryogenic temperatures.
- Systematic variation of experimental parameters (laser position, current frequency/amplitude, temperature).
- Analysis of MPE signal behavior across different magnetic ordering states.
Main Results:
- MPE signal significantly enhanced at lower temperatures.
- Maximum MPE magnitude observed in the antiferromagnetically ordered states of Eu and Mn ions.
- Estimated effective piezoelectric coefficient of 3500 pC/N at 4.5 K, exceeding typical piezoelectric ceramics.
Conclusions:
- Low-temperature MPE in EuMnBi2 exhibits significant enhancement.
- The observed MPE characteristics suggest potential for developing new lead-free piezoelectric materials.
- Further research is needed to address limitations like Joule heating for practical applications.
