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A Strain-Mediated Magnetoelectric-Spin-Torque Hybrid Structure

机译：应变介导的磁电自旋混合结构

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摘要

Magnetization dynamics induced by spin-orbit torques in a heavy-metal/ferromagnet can potentially be used to design low-power spintronics and logic devices. Recent computations have suggested that a strain-mediated spin-orbit torque (SOT) switching in magnetoelectric (ME) heterostructures is fast, energy-efficient, and permits a deterministic 180 degrees magnetization switching. However, its experimental realization has remained elusive. Here, the coexistence of the strain-mediated ME coupling and the SOT in a CoFeB/Pt/ferroelectric hybrid structure is shown experimentally. The voltage-induced strain only slightly modifies the efficiency of SOT generation, but it gives rise to an effective magnetic anisotropy and rotates the magnetic easy axis which eliminates the incubation delay in current-induced magnetization switching. The phase field simulations show that the electric-field-induced effective magnetic anisotropy field can reduce the switching time approximately by a factor of three for SOT in-plane magnetization switching. It is anticipated that such strain-mediated ME-SOT hybrid structures may enable field-free, ultrafast magnetization switching.
机译：由重金属/铁磁体中的自旋轨道转矩引起的磁化动力学可以潜在地用于设计低功率自旋电子器件和逻辑器件。最近的计算表明，磁电（ME）异质结构中的应变介导的自旋轨道转矩（SOT）切换是快速，节能的，并允许确定性的180度磁化切换。但是，它的实验实现仍然难以捉摸。在这里，实验显示了在CoFeB / Pt /铁电混合结构中，应变介导的ME耦合和SOT的共存。电压感应应变只会稍微改变SOT产生的效率，但会引起有效的磁各向异性并旋转易磁化轴，从而消除了电流感应磁化切换中的孵育延迟。相场仿真表明，对于SOT平面内磁化开关，电场感应的有效磁各向异性场可以将开关时间减少大约三倍。可以预料，这种应变介导的ME-SOT混合结构可以实现无场，超快磁化转换。

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  • 来源
    《Advanced Functional Materials》 |2019年第6期|1806371.1-1806371.8|共8页
  • 作者

    Nan Tianxiang; Hu Jia-Mian; Dai Minyi; Emori Satoru; Wang Xinjun; Hu Zhongqiang; Matyushov Alexei; Chen Long-Qing; Sun Nian;

  • 作者单位

    Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA|Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA;

    Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA|Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA;

    Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA|Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA;

    Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA|Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA;

    Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA;

    Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA;

    Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA;

    Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA;

    Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA;

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  • 正文语种 eng
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  • 关键词

    magnetoelectric effect; phase-field simulation; spin Hall effect; spin-orbit torque;

    机译：磁电效应;相场模拟;自旋霍尔效应;自旋轨道转矩;

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