Establishing a deeper understanding of the anisotropy in manganites is useful for tailoring their magnetic properties for device applications. Here we showed that ferromagnetic La_(0.7)Sr_(0.3)MnO_3(LSMO) thin films,e...Establishing a deeper understanding of the anisotropy in manganites is useful for tailoring their magnetic properties for device applications. Here we showed that ferromagnetic La_(0.7)Sr_(0.3)MnO_3(LSMO) thin films,epitaxially grown on SrTiO_3(STO) substrates, exhibited unexpected double-shifted magnetization curves originating from the competition between common biaxial and emergent uniaxial anisotropies. This emergent uniaxial anisotropy could be induced by exchange coupling between the ferromagnetic LSMO and an antiferromagnetic LSMO dead layer at the LSMO/STO interface, which could be manipulated by the degree of oxygen deficiency.展开更多
We report the anisotropy effect and the relaxation dynamics of surface pressure of silica nanoparticle monolayer at the air-water interface. The anisotropy of surface pressure occurs when the water surface is fully co...We report the anisotropy effect and the relaxation dynamics of surface pressure of silica nanoparticle monolayer at the air-water interface. The anisotropy of surface pressure occurs when the water surface is fully covered by particles and becomes more prominent with the increase of surface concentration. Hence, the conception of surface tensor was proposed to characterize the monolayer properties. The dynamics of pressure relaxation involves three timescales which are related to the damping of surface fluctuation, rearrangement of particle rafts and particle motion inside each raft. The anisotropy decays when the layer is kept static and the process is accelerated remarkably by barrier oscillation. The underlying physics mechanism is also discussed in detail for the origin of pressure anisotropy and its decay dynamics.展开更多
基金supported by the National Natural Science Foundation of China(51332001 and 51402164)Tsinghua University Initiative Scientific Research Program(2014Z21010 and 2014Z01006)
文摘Establishing a deeper understanding of the anisotropy in manganites is useful for tailoring their magnetic properties for device applications. Here we showed that ferromagnetic La_(0.7)Sr_(0.3)MnO_3(LSMO) thin films,epitaxially grown on SrTiO_3(STO) substrates, exhibited unexpected double-shifted magnetization curves originating from the competition between common biaxial and emergent uniaxial anisotropies. This emergent uniaxial anisotropy could be induced by exchange coupling between the ferromagnetic LSMO and an antiferromagnetic LSMO dead layer at the LSMO/STO interface, which could be manipulated by the degree of oxygen deficiency.
基金supported by the NPU Foundation for Fundamental Research (Grant No. NPU-FFR-JC20100242)
文摘We report the anisotropy effect and the relaxation dynamics of surface pressure of silica nanoparticle monolayer at the air-water interface. The anisotropy of surface pressure occurs when the water surface is fully covered by particles and becomes more prominent with the increase of surface concentration. Hence, the conception of surface tensor was proposed to characterize the monolayer properties. The dynamics of pressure relaxation involves three timescales which are related to the damping of surface fluctuation, rearrangement of particle rafts and particle motion inside each raft. The anisotropy decays when the layer is kept static and the process is accelerated remarkably by barrier oscillation. The underlying physics mechanism is also discussed in detail for the origin of pressure anisotropy and its decay dynamics.
