Landau-Zener transitions in a system of interacting spins: Exact results for demagnetization probability

被引：17
|
作者：
Ostrovsky, VN [1 ]
Volkov, MV [1 ]
机构：
[1] St Petersburg State Univ, V Fock Inst Phys, St Petersburg 198504, Russia
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 06期
关键词：
D O I：
10.1103/PhysRevB.73.060405
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A set of spins interact with each other by an arbitrary anisotropic interaction and with external magnetic field. The field varies linearly with time and thus induces spin flips. If initially all spins are oriented in the same direction, then the probability of demagnetization is given exactly by a simple analytical expression. Depending on parameter values the spin-spin interactions might enhance or decrease the probability of demagnetization.
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