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首页> 外文期刊>Physical review >Low-nonlinearity spin-torque oscillations driven by ferromagnetic nanocontacts
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Low-nonlinearity spin-torque oscillations driven by ferromagnetic nanocontacts

机译：铁磁纳米接触驱动的低非线性自旋转矩振荡

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摘要

Spin-torque oscillators are strong candidates as nanoscale microwave generators and detectors. However, because of large amplitude-phase coupling (nonlinearity), phase noise is enhanced over other linear autooscil-lators. One way to reduce nonlinearity is to use ferromagnetic layers as a resonator and excite them at localized spots, making a resonator-excitor pair. We investigated the excitation of oscillations in dipole-coupled ferromagnetic layers, driven by localized current at ferromagnetic nanocontacts. Oscillations possessed properties of optical-mode spin waves and at low field (≈200 Oe) had high frequency (15 GHz), a moderate precession amplitude (2°-3°), and a narrow spectral linewidth (＜3 MHz) due to localized excitation at nanocontacts. Micromagnetic simulation showed emission of the resonator's characteristic optical-mode spin waves from disturbances generated by domain-wall oscillations at nanocontacts.
机译：自旋转矩振荡器是纳米级微波发生器和探测器的强大候选者。但是，由于幅度-相位耦合大（非线性），相噪比其他线性自激振荡器有所增强。减少非线性的一种方法是使用铁磁层作为谐振器，并在局部点激励它们，从而形成谐振器-激励器对。我们研究了在偶极耦合铁磁层中由铁磁纳米触点处的局部电流驱动的振荡激发。振荡具有光模自旋波的特性，并且在低场（≈200Oe）下具有高频率（15 GHz），进动幅度适中（2°-3°）和窄谱线宽度（＜3 MHz），这是由于纳米接触的局部激发。微观电磁仿真表明，由纳米接触处的畴壁振荡产生的干扰会产生谐振器的特征光学模式自旋波。

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  • 来源
    《Physical review》 |2016年第2期|024408.1-024408.5|共5页
  • 作者

    Muftah Al-Mahdawi; Yusuke Toda; Yohei Shiokawa; Masashi Sahashi;

  • 作者单位

    Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan;

    Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan;

    Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan;

    Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan;

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