人工反铁磁体中超畴壁的自发涨落
Spontaneous Magnetic Superdomain Wall Fluctuations in an Artificial Antiferromagnet
摘要：
集体动力学通常在确定自然发生的材料和超材料的基态稳定性方面起着重要作用。利用软x射线光子相关谱研究了正方形人工自旋晶格中反铁磁有序超畴的温度动力学。我们观察到的AF起始温度以下的超畴壁运动的指数减慢，类似于典型的散装反铁磁体的行为。使用连续时间随机游走模型，我们表明，这些superdomain壁进行低温弹道和高温扩散运动。
英文摘要：
Collective dynamics often play an important role in determining the stability of ground states for both naturally occurring materials and metamaterials. We studied the temperature dependent dynamics of antiferromagnetically ordered superdomains in a square artificial spin lattice using soft x-ray photon correlation spectroscopy. We observed an exponential slowing down of superdomain wall motion below the AF onset temperature, similar to the behavior of typical bulk antiferromagnets. Using a continuous time random walk model we show that these superdomain walls undergo low-temperature ballistic and high-temperature diffusive motions.
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