磁性材料磁有序的分子场来源

发布时间：2018-06-26 05:36

本文选题：磁有序模型 + 磁性氧化物　；参考：《物理学报》2017年06期

【摘要】：对于磁性材料磁有序能的来源,即外斯分子场来源,本文提出一个模型:在磁性金属和合金中的相邻离子实之间,以及磁性氧化物的相邻阴阳离子间,其外层轨道上高速运动的电子分别有一定概率形成三种不同的状态.1)具有一定寿命的自旋相反的电子对,称为外斯电子对(WEP);2)距离很近且自旋方向相同的电子,容易发生互相交换,交换前后电子的自旋方向保持不变;3)当一个离子外层轨道有2个电子,其相邻的离子外层轨道只有1个电子时,前者多出的电子可以跃迁到后者的轨道上,并且保持自旋方向不变.我们认为,WEP两个电子间的静磁吸引能是分子场(即磁有序能)的主要来源.进而,推导出WEP的能量表达式、两电子的平衡间距和最大间距,探讨了在几种钙钛矿结构锰氧化物中形成外斯电子对的概率,用以解释居里温度附近晶格常数随温度变化的特点.结果表明这个模型是合理的.
[Abstract]:For the source of magnetic ordering energy of magnetic materials, I. e., the source of Wise molecular field, a model is proposed: between adjacent ions in magnetic metals and alloys, and between adjacent anions and anions of magnetic oxides. The electrons moving at high speed in its outer orbit have a certain probability of forming three different states (.1) two pairs of spin opposite electrons with a certain lifetime, called WEP (WEP) 2) which are very close and have the same spin direction. The spin direction of the electrons before and after the exchange remains invariant.) when there are two electrons in an ion outer orbit and only one electron in its adjacent ion outer orbit, the electrons extra from the former can be transferred to the latter orbit. And keep the spin direction unchanged. We consider that the magnetostatic attraction energy between the two electrons of WEP is the main source of the molecular field (that is, the magnetic ordering energy). Furthermore, the energy expression of WEP, the equilibrium distance between two electrons and the maximum spacing are derived, and the probability of forming Weses electron pair in several kinds of perovskite manganese oxides is discussed. It is used to explain the variation of lattice constant with temperature near Curie temperature. The results show that the model is reasonable.
【作者单位】：河北师范大学物理科学与信息工程学院河北省新型薄膜材料实验室;中国科学院物理研究所磁学国家重点实验室;
【基金】：国家自然科学基金(批准号:11174069) 河北省自然科学基金(批准号:A2015205111) 河北省应用基础研究计划重点基础研究项目(批准号:16961106D) 河北省教育厅青年基金(批准号:QN2016015)资助的课题~~
【分类号】：TM271

【相似文献】