纳米磁体晶体中自旋雪崩的多维不稳定性和动力学
Multidimensional instability and dynamics of spin-avalanches in crystals of nanomagnets
摘要：
我们得到了一个基本的不稳定性的磁化开关前在超顺磁性和铁磁性材料，如纳米磁体，铁磁性纳米线，和系统的量子点与大自旋的晶体。我们发展了线性和非线性阶段的不稳定性理论。通过数值模拟，我们研究了纳米磁体晶体中自旋雪崩的不稳定性。这种不稳定性自发地扭曲了锋面，导致了复杂的多维锋面动力学。我们发现不稳定性具有普遍的物理性质，与各种物理系统有着深刻的关系，如燃烧中爆燃前沿的Darrieus-Landau不稳定性，惯性约束聚变和热核超超新星，以及有机半导体中掺杂前沿的不稳定性。
英文摘要：
We obtain a fundamental instability of the magnetization-switching fronts in super-paramagnetic and ferromagnetic materials such as crystals of nanomagnets, ferromagnetic nanowires, and systems of quantum dots with large spin. We develop the instability theory for both linear and nonlinear stages. By using numerical simulations we investigate the instability properties focusing on spin avalanches in crystals of nanomagnets. The instability distorts spontaneously the fronts and leads to a complex multidimensional front dynamics. We show that the instability has a universal physical nature, with a deep relationship to a wide variety of physical systems, such as the Darrieus-Landau instability of deflagration fronts in combustion, inertial confinement fusion and thermonuclear su- pernovae, and the instability of doping fronts in organic semiconductors.
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