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首页> 外文期刊>Physical review >Comprehensive study on ferroelectricity induced by a proper-screw-type magnetic ordering in multiferroic CuFeO_2: Nonmagnetic impurity effect on magnetic and ferroelectric order
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Comprehensive study on ferroelectricity induced by a proper-screw-type magnetic ordering in multiferroic CuFeO_2: Nonmagnetic impurity effect on magnetic and ferroelectric order

机译：多铁性CuFeO_2中适当螺旋型磁有序引起的铁电的综合研究：非磁性杂质对磁和铁电有序的影响

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摘要

We refined the magnetic structure of a ferroelectric (FE) phase of multiferroic CuFe_(1-x)Ga_xO_2 with x = 0.035 by complementary use of spherical neutron polarimetry and a four-circle neutron-diffraction measurement, revealing that the proper-screw-type magnetic structure in the ferroelectric phase has a finite ellipticity of ～0.9. By means of polarized neutron-diffraction and in-situ pyroelectric measurements, we also investigated the quantitative relationship between the macroscopic ferroelectric polarization (P) and the asymmetry in volume fractions with left-handed and right-handed helical magnetic order in CuFe_(1-x)Al_xO_2 with x=0.0155 and CuFe_(1-x)Ga_xO_2 with x=0.035. These measurements revealed that the substitution of a small amount of nonmagnetic Ga~(3+) or Al~(3+) ions does not significantly change the magnitude of the local ferroelectric polarization but does reduce the sensitivity of P to the poling electric field (E_p). This implies that the mobility of the magnetic domain walls, which is sensitive to magnetic defects due to nonmagnetic substitution, determines the sensitivity of P to E_p because of a one-to-one correspondence between the magnetic and ferroelectric domains.
机译：通过互补使用球形中子极化和四圆中子衍射测量，我们完善了x = 0.035的多铁性CuFe_（1-x）Ga_xO_2的铁电（FE）相的磁性结构，揭示了适当的螺旋型铁电相中的磁性结构具有〜0.9的有限椭圆率。通过极化中子衍射和原位热电测量，我们还研究了宏观铁电极化（P）与CuFe_（1-）中具有左旋和右旋螺旋磁阶的体积分数不对称性之间的定量关系。 x）＝ 0.0155的x）Al_xO_2和x ＝ 0.035的CuFe_（1-x）Ga_xO_2。这些测量结果表明，少量非磁性Ga〜（3+）或Al〜（3+）离子的取代不会显着改变局部铁电极化的幅度，但会降低P对极化电场的敏感性（ E_p）。这暗示着由于非磁取代引起的磁缺陷的磁畴壁的迁移率决定了P对E_p的敏感度，因为磁畴和铁电畴之间是一一对应的关系。

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  • 来源
    《Physical review》 |2009年第21期|214423.1-214423.13|共13页
  • 作者

    T. Nakajima; S. Mitsuda; K. Takahashi; M. Yamano; K. Masuda; H. Yamazaki; K. Prokes; K. Kiefer; S. Gerischer; N. Terada; H. Kitazawa; M. Matsuda; K. Kakurai; H. Kimura; Y. Noda; M. Soda; M. Matsuura; K. Hirota;

  • 作者单位

    Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;

    Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;

    Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;

    Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;

    Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;

    Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;

    Helmholtz Centre Berlin for Materials and Energy, Glienicker Strasse 100. Berlin 14109, Germany;

    Helmholtz Centre Berlin for Materials and Energy, Glienicker Strasse 100. Berlin 14109, Germany;

    Helmholtz Centre Berlin for Materials and Energy, Glienicker Strasse 100. Berlin 14109, Germany;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan;

    Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan;

    Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan;

    Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan;

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  • 关键词

    magnetomechanical and magnetoelectric effects, magnetostriction; spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.); ferroelectricity and antiferroelectricity;

    机译：磁机械和磁电效应;磁致伸缩;磁性有序材料的自旋排列（包括中子和自旋极化电子研究;同步辐射源X射线散射等）;铁电和反铁电;

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