Spin–orbit torque nano-oscillator with giant magnetoresistance readout
Spin–orbit torque nano-oscillator with giant magnetoresistance readout
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DOI：
10.1038/s42005-020-00454-7
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发表时间：
2020-10
影响因子：
5.5
通讯作者：
Jen-Ru Chen;Andrew Smith;E. Montoya;J. Lu;I. Krivorotov
中科院分区：
文献类型：
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作者：
Jen-Ru Chen;Andrew Smith;E. Montoya;J. Lu;I. Krivorotov
基于铁磁性和非磁性金属双层的自旋轨道力矩纳米振荡器是一种超紧凑的电流控制微波信号源。它们在微波辅助磁记录、神经形态计算和芯片到芯片无线通信等实际应用中具有很大的吸引力。然而，这些器件的一个主要缺点是由于铁磁层的各向异性磁阻相对较小而产生的低输出微波功率。在这里，我们的实验表明，自旋轨道力矩纳米振荡器的输出功率可以在不影响其结构简单性的情况下显著提高。在振荡器中增加一个铁磁参考层，使我们可以利用面内电流巨磁电阻来提高器件的输出功率。这种输出功率的增强既是巨磁电阻比各向异性磁阻大的结果，也是它们不同的角度依赖性的结果。我们的结果为自旋轨道力矩纳米振荡器的实际应用提供了希望。
Spin-orbit torque nano-oscillators based on bilayers of ferromagnetic and nonmagnetic metals are ultra-compact current-controlled microwave signal sources. They are attractive for practical applications such as microwave assisted magnetic recording, neuromorphic computing, and chip-to-chip wireless communications. However, a major drawback of these devices is low output microwave power arising from the relatively small anisotropic magnetoresistance of the ferromagnetic layer. Here we experimentally show that the output power of a spin-orbit torque nano-oscillator can be significantly enhanced without compromising its structural simplicity. Addition of a ferromagnetic reference layer to the oscillator allows us to employ current-in-plane giant magnetoresistance to boost the output power of the device. This enhancement of the output power is a result of both large magnitude of giant magnetoresistance compared to that of anisotropic magnetoresistance and their different angular dependencies. Our results hold promise for practical applications of spin-orbit torque nano-oscillators.