论文标题
旋转厅纳米振荡器的选择热控制
Optothermal control of spin Hall nano-oscillators
论文作者
论文摘要
我们研究了局部激光加热对170 nm宽的纳米收缩式旋转霍尔纳米振荡器（SHNO）的自动振荡性能的影响，该特性是由蓝宝石底物上的Nife/pt Biyer制造的。 532 nm连续波激光器的聚焦为大约500 nm，范围为0至12 mW。通过与电阻加热进行比较，我们估计局部温度升高约为8 k/mW。我们证明了阈值电流，频率和峰值功率的可逆激光调谐，并发现SHNO频率可以通过高达350 MHz调节，这是单独调整的三倍以上。温度升高还会导致信号抖动增加，阈值电流增加以及自动振荡的最大电流减少。我们的结果为在较大的SHNO网络中的单个SHNO的光学控制开放，而无需额外的电压门。
We investigate the impact of localized laser heating on the auto-oscillation properties of a 170 nm wide nano-constriction spin Hall nano-oscillators (SHNO) fabricated from a NiFe/Pt bilayer on a sapphire substrate. A 532 nm continuous wave laser is focused down to a spot size of about 500 nm at a power ranging from 0 to 12 mW. Through a comparison with resistive heating, we estimate a local temperature rise of about 8 K/mW. We demonstrate reversible laser tuning of the threshold current, the frequency, and the peak power, and find that the SHNO frequency can be tuned by up to 350 MHz, which is over three times more than the current tuning alone. Increasing the temperature also results in increased signal jitter, an increased threshold current, and a reduced maximum current for auto-oscillations. Our results open up for optical control of single SHNOs in larger SHNO networks without the need for additional voltage gates.
