时间无序磁性理论在磁掺杂ZnO中的应用
Theory of magnetism with temporal disorder applied to magnetically doped ZnO
摘要：
本文提出了一种非对称伊辛玻璃的动力学模型：一种在铁磁基体中随机排列概率为q的反铁磁键的伊辛模型。动力学是通过在n个蒙特卡罗步骤后改变反铁磁键的排列而引入的，但保持q和自旋组态的值不变。在铁磁和顺磁状态之间存在二级跃迁的区域中，动态行为遵循运动窄化的预期，并且仅在大n时恢复到静态行为。在铁磁态和自旋玻璃态之间存在一级跃迁时，存在一种不同的动力学行为，在这种情况下，没有显示出运动窄化效应。这一影响进行了讨论。这个模型的目的是解释掺杂ZnO的磁化强度降低时，交换相互作用随时间变化的属性。
英文摘要：
A dynamic model of the asymmetric Ising glass is presented: an Ising model with antiferromagnet bonds with probabilities q arranged at random in a ferromagnetic matrix. The dynamics is introduced by changing the arrangement of the antiferromagnetic bonds after n Monte Carlo steps but keeping the same value of q and spin configuration. In the region where there is a second order transition between the ferromagnetic and paramagnetic states the dynamic behaviour follows that expected for motional narrowing and reverts to the static behaviour only for large n. There is a different dynamic behaviour where there is a first order transition between the ferromagnetic and spin glass states where it shows no effects of motional narrowing. The implications of this are discussed. This model is devised to explain the properties of doped ZnO where the magnetisation is reduced when the exchange interactions change with time.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
