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Magnetic bistability: From microscopic to macroscopic understandings of hysteretic behavior using abinitio calculations

机译:磁性双稳态:从头到尾使用计算方法从微观到宏观对滞后行为的理解

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We study the hysteretic behavior in spin-crossover materials using wave-function ab initio calculations to identify the physical ingredients governing such manifestation. We show that the hysteresis loop is mainly controlled by electrostatic contributions which are here quantified, in contrast with phenomenological descriptions which traditionally rely on the apparent need for intermolecular contacts. A general thermodynamic model based on ab initio information is developed to account for the relevant collective contributions. The magnetic memory appears to be governed by the simultaneous electronic relocalization within the individual constituents and the fluctuation of the Madelung potential difference created by the two spin states. An electronic trapping scenario is suggested to rationalize the hysteresis phenomenon.
机译:我们使用波函数从头算来研究自旋交联材料中的磁滞行为,以确定控制这种表现形式的物理成分。我们表明,磁滞回线主要受此处定量的静电作用控制,这与传统上依赖于对分子间接触的明显需求的现象学描述相反。建立了一个从头算信息的通用热力学模型来说明相关的集体贡献。磁存储器似乎受单个成分中同时进行的电子重新定位以及由两个自旋状态产生的马德隆电势差的波动支配。建议使用电子陷波方案来合理化磁滞现象。

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