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Magnetoelectric properties of 500-nm Cr_2O_3 films

机译：500nm Cr_2O_3薄膜的磁电性能

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摘要

The linear magnetoelectric effect was measured in 500-nm Cr_2O_3 films grown by radio frequency sputtering on Al_2O_3 substrates between top and bottom thin film Pt electrodes. Magnetoelectric susceptibility was measured directly by applying an alternating current (ac) electric field and measuring the induced ac magnetic moment using superconducting quantum interference device magnetometry. A linear dependence of the induced ac magnetic moment on the ac electric field amplitude was found. The temperature dependence of the magnetoelectric susceptibility agreed qualitatively and quantitatively with prior measurements of bulk single crystals, but the characteristic temperatures of the film were lower than those of single crystals. It was also possible to reverse the sign of the magnetoelectric susceptibility by reversing the sign of the magnetic field applied during cooling through the Neel temperature. A competition between total magnetoelectric and Zeeman energies is proposed to explain the difference between film and bulk Cr_2O_3 regarding the cooling field dependence of the magnetoelectric effect.
机译：在通过射频溅射在顶部和底部薄膜Pt电极之间的Al_2O_3基板上生长的500 nm Cr_2O_3膜中测量了线性磁电效应。通过施加交流（ac）电场并使用超导量子干涉仪磁力计测量感应的交流磁矩来直接测量磁化率。发现感应的交流磁矩与交流电场幅度呈线性关系。磁电敏感性的温度依赖性与块状单晶的先前测量在定性和定量上一致，但是膜的特征温度低于单晶。通过反转在通过尼尔温度的冷却期间施加的磁场的符号，也可以反转磁电敏感性的符号。提出了总磁电能量与塞曼能量之间的竞争关系，以解释薄膜和块体Cr_2O_3在磁电效应的冷却场相关性方面的差异。

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  • 来源
    《Physical review》 |2016年第17期|174415.1-174415.7|共7页
  • 作者

    P. Borisov; T. Ashida; T. Nozaki; M. Sahashi; D. Lederman;

  • 作者单位

    Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506-6315, USA;

    Department of Electronic Engineering, Tohoku University, Sendai 980-0845, Japan;

    Department of Electronic Engineering, Tohoku University, Sendai 980-0845, Japan;

    Department of Electronic Engineering, Tohoku University, Sendai 980-0845, Japan;

    Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506-6315, USA,Department of Physics, University of California, Santa Cruz, California 95064, USA;

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