利用CoGd亚铁磁体实现高能效的自旋霍尔纳米振荡器
Energy-efficient spin Hall nano-oscillators using near-compensated CoGd ferrimagnets
AI总结：
该研究利用CoGd亚铁磁体制备自旋霍尔纳米振荡器，通过成分调控在磁化补偿点附近实现低电流密度、小磁场与窄线宽，性能较铁磁同类器件提升一个数量级，为高能效自旋电子器件提供新平台。
AI中文摘要：
传统基于铁磁体的自旋霍尔纳米振荡器（SHNOs）面临实际局限，其阈值电流密度高且需大的外部磁场。亚铁磁体因独特的磁动力学特性及实现高能效自旋电子器件的潜力，成为有吸引力的替代方案。本研究报道利用Co₁₋ₓGdₓ合金的稀土-过渡金属（RE-TM）亚铁磁SHNOs，成分调控可使其在磁化补偿点附近实现高性能运行。优化后的SHNO在低电流密度（1.43×10^7 A/cm²）、小磁场（5 mT）下工作，同时呈现窄线宽（0.61 MHz），相比铁磁体同类器件性能提升一个数量级。这种增强性能源于补偿点附近的高自旋轨道转矩效率、低磁各向异性、降低的有效磁化强度及最小化的非线性。这些结果确立了RE-TM亚铁磁体作为下一代自旋电子器件的有前景材料平台，并为实现高能效、高性能自旋电子振荡器提供新策略。
英文摘要：
Conventional spin Hall nano-oscillators (SHNOs) based on ferromagnets face practical limitations due to high threshold current densities and large external magnetic field requirements. Ferrimagnets provide an attractive alternative due to their unique magnetic dynamics and potential for energy-efficient spintronic devices. In this study, we report rare-earth-transition-metal (RE-TM) ferrimagnetic SHNOs utilizing Co1-xGdx alloys, in which compositional tuning enables high-performance operation near the magnetization compensation. The optimized SHNO operates at a low current density (1.43*10^7 A/cm^2), a small magnetic field (5 mT), and exhibits a narrow linewidth (0.61 MHz) simultaneously, showing an order-of-magnitude improvement over its ferromagnetic counterparts. This enhanced performance arises from high spin-orbit torque efficiency, low magnetic anisotropy, reduced effective magnetization, and minimized nonlinearity near the compensation point. These results establish RE-TM ferrimagnets as a promising material platform for next-generation spintronic devices and offer new strategies for realizing energy-efficient, high-performance spintronic oscillators.
