La_(0.7)Sr_(0.3)MnO_3-PZT双层膜中的磁电耦合

Magnetoelectric Coupling in Bilayers of La_(0.7)Sr_(0.3)MnO_3-PZT

讨论了La0.7Sr0.3MnO3-Pb(Zr,Ti)O3双层膜的磁电(ME)效应.La0.7Sr0.3MnO3粉料由溶胶-凝胶法制成,经1 300 K热压并在1 573 K高温下烧结而成.在该双层膜中测量到了很强的磁电相互作用.相较于厚膜型(tape casting)复合样品,该双层膜显示出更为优良的ME耦合.反映其ME耦合效应强弱的电压系数αE是在一定的磁场、温度和频率下测得的.横向耦合要比纵向耦合更为强烈,并在225 K时ME电压系数达到峰值.分析表明由磁场和频率变化导致的ME系数变化的实验值与理论值符合的很好.

The synthesis and magnetoelectric （ME） characterization of bilayers of La0. 7 Sr0. 3 MnO3-Pb （ Zr, Ti）O3 are discussed. The La07Sr03 MnO3 powder is prepared with a sol-gel clue, then hot-pressed at 1 300 K and sintered at 1 573 K. A very strong ME interactions are measured for the bilayers, The bilayers exhibit superior ME coupling compared to thick film composites prepared by tape casting process. Data on ME voltage coefficient αE have been obtained as a function of bias magnetic field and temperature. The transverse coupling is stronger than the longitudinal interactions and a maximum in the ME voltage coefficient is measured at 225 K. There is excellent agreement between theory and data for the field of ME coefficients.