Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures

Yuki Shiomi, Hidetoshi Masuda, Hidefumi Takahashi, Shintaro lshiwata

研究成果: Article査読


Magneto-piezoelectric effect (MPE) refers to generation of strain in response to electric currents in magnetic metals which lack both time-reversal and space-inversion symmetries. A recent experimental paper demonstrated the MPE in the antiferromagnetic metal EuMnBi2 at 77 K, but the limited temperature range of the MPE measurement hampered detailed discussion on the MPE. Here we extend the measurement temperature range down to liquid He temperature, and studied the dependences of the MPE on the laser position, frequency and amplitude of electric currents, and temperature in the very low temperature range. We show that the MPE signal is enhanced at low temperatures and reaches a maximum magnitude in the antiferromagnetically ordered states of both Eu and Mn ions. An effective piezoelectric coefficient for the MPE at 4.5 K is estimated to be as large as 3500 pC/N, which is much larger than piezoelectric coefficients of typical piezoelectric ceramics, although the magnitude of real MPE displacements should be limited due to strong Joule heating at high electric currents. The present results may open up a new strategy to realize new lead-free piezoelectric materials.

ジャーナルScientific reports
出版ステータスPublished - 2020 12 1

ASJC Scopus subject areas

  • General

フィンガープリント 「Large Magneto-piezoelectric Effect in EuMnBi<sub>2</sub> Single Crystal at Low Temperatures」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。