过渡金属氧化物轨道占据和磁矩的电场控制
Electric-Field Control of the Orbital Occupancy and Magnetic Moment of a Transition-Metal Oxide.
作者信息
Preziosi Daniele, Alexe Marin, Hesse Dietrich, Salluzzo Marco
机构信息
Max Planck Institute of Microstructure Physics, Weinberg 2D-06120 Halle, Germany; Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom; and CNR-SPIN, Complesso Universitario di Monte Sant'Angelo, via Cinthia I-80126 Napoli, Italy.
出版信息
Phys Rev Lett. 2015 Oct 9;115(15):157401. doi: 10.1103/PhysRevLett.115.157401. Epub 2015 Oct 6.
By using soft-x-ray linear and magnetic dichroism on La_{0.825}Sr_{0.175}MnO_{3}/PbZr_{0.2}Ti_{0.8}O_{3} ferromagnetic-ferroelectric heterostructures we demonstrate a nonvolatile modulation of the Mn 3d orbital anisotropy and magnetic moment. X-ray absorption spectroscopy at the Mn L_{2,3} edges shows that the ferroelectric polarization direction modifies the carrier density, the spin moment, and the orbital splitting of t_{2g} and e_{g} Mn 3d states. These results are consistent with polar distortions of the oxygen octahedra surrounding the Mn ions induced by the switching of the ferroelectric polarization.
通过对(La_{0.825}Sr_{0.175}MnO_{3}/PbZr_{0.2}Ti_{0.8}O_{3})铁磁-铁电异质结构使用软X射线线性和磁二向色性，我们证明了Mn 3d轨道各向异性和磁矩的非易失性调制。Mn (L_{2,3}) 边的X射线吸收光谱表明，铁电极化方向改变了载流子密度、自旋矩以及(t_{2g}) 和 (e_{g}) Mn 3d态的轨道分裂。这些结果与铁电极化切换引起的Mn离子周围氧八面体的极性畸变一致。
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