Competing Magnetic Anisotropy Fields and Double Polarization Flops in Multiferroic Mn

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概要

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• We report the cobalt doping dependencies of the ferroelectric polarization and underlying incommensurate spiral magnetic ordering in multiferroic Mn<inf>1-x</inf>Co<inf>x</inf>WO<inf>4</inf>(0 \leq x < 0.18). The spiral ordering changed its rotational plane upon cobalt doping (x \sim 0.1), followed by heliconical ordering at higher doping (x > 0.15). These consecutive changes were accompanied by simultaneous 90° flops of ferroelectric polarizations. Such doping dependencies are driven by the competitions between the anisotropy fields of MnWO<inf>4</inf>and CoWO<inf>4</inf>, the spatial distributions of which are nearly orthogonal to each other. We propose a model that can consistently describe the two consecutive flops based on a combined picture of magnetic anisotropy and biquadratic exchange.

• 2013-12-15

著者

• Chung Jae-ho

  Department Of Physics Korea University

• KIM Kee

  CeNSCMR, Department of Physics and Astronomy, Seoul National University

• Song Young-Sang

  Department of Physics, Korea University, Seoul 136-713, Republic of Korea

• Kim Kee

  CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea

• Chun Sae

  CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea

• Schefer Jürg

  Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

• Schefer Jürg

  Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

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• Low Temperature Structural Instability of Tetragonal Spinel Mn
• Competing Magnetic Anisotropy Fields and Double Polarization Flops in Multiferroic Mn
• Low Temperature Structural Instability of Tetragonal Spinel Mn₃O₄

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