论文标题
脉冲辅助磁化强度切换在Picsecond和Nansecond时标的磁性纳米线中
Pulse-assisted magnetization switching in magnetic nanowires at picosecond and nanosecond timescales with low energy
论文作者
论文摘要
对于磁性纳米材料中的自旋动力学的详细理解对于开发超快，低能和高密度的自旋逻辑和记忆是必要的。在这里，我们开发了微磁模型和分析溶液，以阐明增加阻尼和单轴各向异性对具有垂直磁各向异性和Yttrium Irontrium Iron型石榴石类似的旋转旋转特性的纳米线的磁场脉冲辅助开关时间，能量和田间需求的影响。纳米线最初使用外部磁场脉冲（写）和自我释放进行磁化。接下来，在两种垂直极性中接收2.5 ns长的外部磁性脉冲时，磁矩表现出确定性切换。有利的阻尼（α〜0.1-0.5）和各向异性能量（10^4-10^5 J M^-3）允许低于picsecond磁化的切换时间。使用自旋进动不稳定性观察到磁化逆转，磁场的磁场逆转。所需的切换率，能源成本和外部场中出现了竞争或纳米磁三元素。在室温下，开发具有优化阻尼和有效各向异性的磁性纳米线可以将开关屏障降低至3163KBT。因此，纳米磁体中的脉冲辅助皮秒和低能转换可以实现超快速纳米磁性逻辑和细胞自动机。
Detailed understanding of spin dynamics in magnetic nanomaterials is necessary for developing ultrafast, low-energy and high-density spintronic logic and memory. Here, we develop micromagnetic models and analytical solutions to elucidate the effect of increasing damping and uniaxial anisotropy on magnetic field pulse-assisted switching time, energy and field requirements of nanowires with perpendicular magnetic anisotropy and yttrium iron garnet-like spin transport properties. A nanowire is initially magnetized using an external magnetic field pulse (write) and self-relaxation. Next, magnetic moments exhibit deterministic switching upon receiving 2.5 ns-long external magnetic pulses in both vertical polarities. Favorable damping (α~0.1-0.5) and anisotropy energies (10^4-10^5 J m^-3) allow for as low as picosecond magnetization switching times. Magnetization reversal with fields below coercivity was observed using spin precession instabilities. A competition or a nanomagnetic trilemma arises among the switching rate, energy cost and external field required. Developing magnetic nanowires with optimized damping and effective anisotropy could reduce the switching energy barrier down to 3163kBT at room temperature. Thus, pulse-assisted picosecond and low energy switching in nanomagnets could enable ultrafast nanomagnetic logic and cellular automata.
