Liu Yan, Zhao Yonggang, Li Peisen, Zhang Sen, Li Dalai, Wu Hao, Chen Aitian, Xu Yang, Han X F, Li Shiyan, Lin Di, Luo Haosu
Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University , Beijing 100084, China.
Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
ACS Appl Mater Interfaces. 2016 Feb 17;8(6):3784-91. doi: 10.1021/acsami.5b10233. Epub 2016 Feb 3.
Electric-field control of magnetism in multiferroic heterostructures composed of Co40Fe40B20 (CoFeB) and (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) with different ferroelectric phases via changing composition and temperature is explored. It is demonstrated that the nonvolatile looplike bipolar-electric-field-controlled magnetization, previously found in the CoFeB/PMN-xPT heterostructures with PMN-xPT in the rhombohedral (R) phase around the morphotropic phase boundary (MPB), also occurs for PMN-xPTs with both R phase (far away from MPB) and monoclinic (M) phase, suggesting that the phenomenon is the common feature of CoFeB/PMN-xPT multiferroic heterostructures for PMN-xPT with different phases. The magnitude of the effect changes with increasing temperature and volatile bipolar-electric-field-controlled magnetization with a butterflylike behavior occurs when the ferroelectric phase changes to the tetragonal phase (T). Moreover, for the R-phase sample with x = 0.18, an abrupt and giant increase of magnetization is observed at a characteristic temperature in the temperature dependence of magnetization curve. These results are discussed in terms of coupling between magnetism and ferroelectric domains including macro- and microdomains for different ferroelectric phases. This work is helpful for understanding the phenomena of electric-field control of magnetism in FM/FE multiferroic heterostructures and is also important for applications.
通过改变成分和温度,研究了由Co40Fe40B20(CoFeB)和具有不同铁电相的(1 - x)Pb(Mg1/3Nb2/3)O3 - xPbTiO3(PMN - xPT)组成的多铁性异质结构中磁性的电场控制。结果表明,先前在同型相界(MPB)附近具有菱面体(R)相PMN - xPT的CoFeB/PMN - xPT异质结构中发现的非易失性环状双极电场控制磁化,在具有R相(远离MPB)和单斜(M)相的PMN - xPT中也会出现,这表明该现象是CoFeB/PMN - xPT多铁性异质结构中PMN - xPT不同相的共同特征。该效应的大小随温度升高而变化,当铁电相转变为四方相(T)时,会出现具有蝶形行为的挥发性双极电场控制磁化。此外,对于x = 0.18的R相样品,在磁化曲线的温度依赖性中,在一个特征温度下观察到磁化强度突然大幅增加。从磁性与不同铁电相的宏观和微观铁电畴之间的耦合角度对这些结果进行了讨论。这项工作有助于理解铁磁/铁电多铁性异质结构中磁性的电场控制现象,对应用也很重要。