BiFeO3/La0.7Sr 0.3MnO 3多层膜界面的磁电耦合
Magnetoelectric coupling at the interface of BiFeO3/La0.7Sr0.3MnO3 multilayers
摘要：
由铁磁锰氧化物La_（0.7）Sr_（0.3）MO_3和铁电反铁磁BiFeO_3组成的异质结构中的电场控制交换偏置最近已被实验证实。通过微观模型的哈密顿量，我们提供了一个可能的解释这种磁电耦合的起源。我们发现，在协议与实验结果，在BiFeO3接口的净铁磁矩。感应铁磁矩是体材料BiFeO 3中占主导地位的e_g电子双交换和t_2g自旋反铁磁超交换相互竞争的结果。这些同时铁磁和反铁磁倾向的平衡强烈影响的界面电子电荷密度，反过来，可以控制的BiFeO3铁电极化。
英文摘要：
Electric-field controlled exchange bias in a heterostructure composed of the ferromagnetic manganite La0.7Sr0.3MO3 and the ferroelectric antiferromagnetic BiFeO3 has recently been demonstrated experimentally. By means of a microscopic model Hamiltonian we provide a possible explanation of the origin of this magnetoelectric coupling. We find, in agreement with experimental results, a net ferromagnetic moment at the BiFeO3 interface. The induced ferromagnetic moment is the result of the competition between the e_g-electrons double exchange and the t_2g-spins antiferromagnetic superexchange that dominate in bulk BiFeO3. The balance of these simultaneous ferromagnetic and antiferromagnetic tendencies is strongly affected by the interfacial electronic charge density which, in turn, can be controlled by the BiFeO3 ferroelectric polarization.
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。
