LaNiO3/CaMnO3 超晶格中的界面铁磁性。
Interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices.
机构信息
Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
出版信息
Phys Rev Lett. 2013 Aug 23;111(8):087202. doi: 10.1103/PhysRevLett.111.087202. Epub 2013 Aug 21.
We observe interfacial ferromagnetism in superlattices of the paramagnetic metal LaNiO3 and the antiferromagnetic insulator CaMnO3. LaNiO3 exhibits a thickness dependent metal-insulator transition and we find the emergence of ferromagnetism to be coincident with the conducting state of LaNiO3. That is, only superlattices in which the LaNiO3 layers are metallic exhibit ferromagnetism. Using several magnetic probes, we have determined that the ferromagnetism arises in a single unit cell of CaMnO3 at the interface. Together these results suggest that ferromagnetism can be attributed to a double exchange interaction among Mn ions mediated by the adjacent itinerant metal.
我们在顺磁金属 LaNiO3 和反铁磁绝缘体 CaMnO3 的超晶格中观察到了界面铁磁性。LaNiO3 表现出厚度依赖的金属-绝缘体转变，我们发现铁磁性的出现与 LaNiO3 的导带状态一致。也就是说，只有 LaNiO3 层为金属的超晶格才表现出铁磁性。通过使用几种磁性探针，我们已经确定铁磁性出现在 CaMnO3 的单个单元胞中。这些结果表明，铁磁性可以归因于相邻巡游金属介导热力学 Mn 离子之间的双交换相互作用。
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