Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China.
Phys Rev Lett. 2019 Mar 22;122(11):117601. doi: 10.1103/PhysRevLett.122.117601.
Materials with a coexistence of magnetic and ferroelectric order (i.e., multiferroics) provide an efficient route for the control of magnetism by electric fields. Unfortunately, a long-sought room temperature multiferroic with strongly coupled ferroelectric and ferromagnetic (or ferrimagnetic) orderings is still lacking. Here, we propose that hydrogen intercalation in antiferromagnetic transition-metal oxides is a promising way to realize multiferroics with strong magnetoelectric coupling. Taking brownmillerite SrCoO_{2.5} as an example, we show that hydrogen intercalated SrCoO_{2.5} displays strong ferrimagnetism and large electric polarization in which the hydroxide acts as a new knob to simultaneously control the magnetization and polarization at room temperature. We expect that ion intercalation will become a general way to design magnetoelectric and spintronic functional materials.
具有磁序和铁电序共存的材料（即多铁性材料）为通过电场控制磁性提供了有效的途径。不幸的是，人们一直渴望找到具有强耦合铁电序和铁磁序（或亚铁磁序）的室温多铁性材料，但至今仍未实现。在这里，我们提出在反铁磁过渡金属氧化物中进行氢插层是实现强磁电耦合多铁性材料的一种很有前途的方法。以褐锰矿型 SrCoO_{2.5}为例，我们表明，氢插层 SrCoO_{2.5} 表现出强铁磁性和大的电极化，其中氢氧化物作为一个新的旋钮可以在室温下同时控制磁化和极化。我们预计离子插层将成为设计磁电和自旋电子功能材料的通用方法。
