分子磁体中的自旋隧穿前沿
Fronts of spin tunneling in molecular magnets
摘要：
在分子磁体如Mn-12 Ac中，在偏置共振下的耗散自旋隧穿跃迁由偶极场控制，偶极场可以使系统共振和非共振。它示出，这导致自旋弛豫的形式的传播前沿的隧穿，与偶极场调整自洽地提供一个零偏置内的前核心。有两个区域的前传播：层状和非层状不连续磁化和偶极场。在层流状态下，如果横向场足够大，波前的速度可以超过磁爆燃的速度。磁场扫过晶体末端附近可以引发隧穿前沿。
英文摘要：
Dissipative spin-tunneling transitions at biased resonances in molecular magnets such as Mn-12 Ac are controlled by the dipolar field that can bring the system on and off resonance. It is shown that this leads to spin relaxation in form of propagating fronts of tunneling, with the dipolar field adjusting self-consistently to provide a zero bias within the front core. There are two regimes of the front propagation: laminar and non-laminar with discontinuous magnetization and dipolar field. In the laminar regime the speed of the front can exceed that of the magnetic deflagration, if the transverse field is large enough. Fronts of tunneling can be initiated by magnetic field sweep near the end of the crystal.
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