论文标题
由铁磁和抗铁磁共振驱动的当前波动
Current Fluctuations Driven by Ferromagnetic and Antiferromagnetic Resonance
论文作者
论文摘要
我们考虑在金属之间夹杂在铁磁体或抗铁磁铁中的电子传输。当磁性材料中旋转时，它们会散发出电流到周围的导体中。通常，介观系统中的绝热泵送也可以增强当前的波动。我们概括了使用散射理论以三种方式旋转动力学驱动的当前波动的描述。首先，我们的理论描述了与任何给定电子散射特性的一般连接。其次，我们考虑抗铁磁铁和铁磁体。第三，我们处理多发设备。使用射击噪声引起的电流波动来揭示抗铁磁共振似乎比使用它们揭示铁磁共振更容易。该结果的起源是，与热能相比，相关能量要高得多。热能控制着独立于自旋动力学的约翰逊 - 尼奎斯特。我们给出各种连接的结果，例如弹道和无序接触。最后，我们讨论实验后果。
We consider electron transport in ferromagnets or antiferromagnets sandwiched between metals. When spins in the magnetic materials precess, they emit currents into the surrounding conductors. Generally, adiabatic pumping in mesoscopic systems also enhances current fluctuations. We generalize the description of current fluctuations driven by spin dynamics in three ways using scattering theory. First, our theory describes a general junction with any given electron scattering properties. Second, we consider antiferromagnets as well as ferromagnets. Third, we treat multiterminal devices. Using shot noise-induced current fluctuations to reveal antiferromagnetic resonance appears to be easier than using them to reveal ferromagnetic resonance. The origin of this result is that the associated energies are much higher as compared to the thermal energy. The thermal energy governs the Johnson-Nyquist that is independent of the spin dynamics. We give results for various junctions, such as ballistic and disordered contacts. Finally, we discuss experimental consequences.
