用量子一阶反转曲线（QFORC）研究磁化强度的宏观量子隧穿
Macroscopic quantum tunneling of magnetization explored by quantum-first-order reversal curves (QFORC)
摘要：
提出了一种研究具有磁滞效应的量子双阱势系统基本问题的新方法。该方法，创造量子一阶反转曲线（QFORC）分析，是由传统的一阶反转曲线（FORC）协议的启发，基于Preisach模型的滞后现象。我们成功地测试了QFORC方法在Mn12Ac分子磁体的特殊磁滞，这是由宏观量子隧穿磁化。QFORC方法允许人们快速地再现实验磁化行为，更重要的是，获得的信息是很难从基于矩阵对角化的通常方法推断。这是可能的分离的热激活和隧穿贡献的磁化变化，以及理解每个实验观察到的磁化曲线的跳跃，并将它们与特定的量子跃迁。
英文摘要：
A novel method to study the fundamental problem of quantum double well potential systems that display magnetic hysteresis is proposed. The method, coined quantum-first-order reversal curve (QFORC) analysis, is inspired by the conventional first-order reversal curve (FORC) protocol, based on the Preisach model for hysteretic phenomena. We successfully tested the QFORC method in the peculiar hysteresis of the Mn12Ac molecular magnet, which is governed by macroscopic quantum tunneling of magnetization. The QFORC approach allows one to quickly reproduce well the experimental magnetization behavior, and more importantly to acquire information that is difficult to infer from the usual methods based on matrix diagonalization. It is possible to separate the thermal activation and tunneling contributions from the magnetization variation, as well as understand each experimentally observed jump of the magnetization curve and associate them with specific quantum transitions.
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