纳米磁体中的重入自旋翻转跃迁
Re-entrant spin-flop transition in nanomagnets
摘要：
具有奇数自旋的反铁磁链在受到增加的磁场时，已知会经历从反平行到自旋翻转配置的转变。我们表明，在存在的各向异性有利于对齐垂直的领域，自旋翻转状态出现弱场和强场，反平行状态出现在中间领域。这两个转变是二阶的，配置随场强连续变化。这种重入跃迁相对于量子涨落是稳健的，并且可以在不同类型的纳米磁体中观察到。
英文摘要：
Antiferromagnetic chains with an odd number of spins are known to undergo a transition from an antiparallel to a spin-flop configuration when subjected to an increasing magnetic field. We show that in the presence of an anisotropy favoring alignment perpendicular to the field, the spin-flop state appears for both weak and strong field, the antiparallel state appearing for intermediate fields. Both transitions are second order, the configuration varying continuously with the field intensity. Such re-entrant transition is robust with respect to quantum fluctuations and it might be observed in different types of nanomagnets.
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