论文标题
相关驱动的八倍磁各向异性在二维氧化物单层中
Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer
论文作者
论文摘要
二维系统中的工程磁各向异性具有巨大的科学和技术意义。二维磁体普遍表现出的单轴各向异性只有两个稳定的旋转方向，要求在状态之间进行180度的自旋切换。我们通过诱导（srruo3）1/（srtio3）n超晶格中的自旋重新定位，在磁性SRRUO3单层中展示了一个新颖的八倍各向异性，其中RU旋转的磁易于轴从单轴<001>方向（n = 1 and 2 and 2 and 2 and 2 and 2）转变为nford（n = 1 and 2）<111> n = n = 4 = n = n = n = 4 = n = n = n = n = n = n = n = n = n = n = 4 = n = n = n = n = n = n = 4 = n = n = n。这个八倍各向异性使SRRUO3单层中的71和109度旋转开关类似于铁电bifeo3中的71和109度极化开关。第一原则计算表明，增加SRTIO3层厚度会诱导出现相关驱动的轨道顺序，调整自旋轨道相互作用并重新定位SRRUO3单层易于轴。我们的工作表明，可以利用相关效应来实质性地改变自旋轨道相互作用，从而稳定二维磁体中前所未有的特性，并为低功率，多状态设备应用开放丰富的机会。
Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by two-dimensional magnets has only two stable spin directions, demanding 180 degrees spin switching between states. We demonstrate a novel eightfold anisotropy in magnetic SrRuO3 monolayers by inducing a spin reorientation in (SrRuO3)1/(SrTiO3)N superlattices, in which the magnetic easy axis of Ru spins is transformed from uniaxial <001> direction (N = 1 and 2) to eightfold <111> directions (N = 3, 4 and 5). This eightfold anisotropy enables 71 and 109 degrees spin switching in SrRuO3 monolayers, analogous to 71 and 109 degrees polarization switching in ferroelectric BiFeO3. First-principle calculations reveal that increasing the SrTiO3 layer thickness induces an emergent correlation-driven orbital ordering, tuning spin-orbit interactions and reorienting the SrRuO3 monolayer easy axis. Our work demonstrates that correlation effects can be exploited to substantially change spin-orbit interactions, stabilizing unprecedented properties in two-dimensional magnets and opening rich opportunities for low-power, multi-state device applications.
