Bluschke M, Frano A, Schierle E, Minola M, Hepting M, Christiani G, Logvenov G, Weschke E, Benckiser E, Keimer B
Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
Helmholtz-Zentrum Berlin für Materialien und Energie, Wilhelm-Conrad-Röntgen-Campus BESSY II, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
Phys Rev Lett. 2017 May 19;118(20):207203. doi: 10.1103/PhysRevLett.118.207203. Epub 2017 May 17.
Resonant x-ray scattering at the Dy M_{5} and Ni L_{3} absorption edges was used to probe the temperature and magnetic field dependence of magnetic order in epitaxial LaNiO_{3}-DyScO_{3} superlattices. For superlattices with 2 unit cell thick LaNiO_{3} layers, a commensurate spiral state develops in the Ni spin system below 100 K. Upon cooling below T_{ind}=18 K, Dy-Ni exchange interactions across the LaNiO_{3}-DyScO_{3} interfaces induce collinear magnetic order of interfacial Dy moments as well as a reorientation of the Ni spins to a direction dictated by the strong magnetocrystalline anisotropy of Dy. This transition is reversible by an external magnetic field of 3 T. Tailored exchange interactions between rare-earth and transition-metal ions thus open up new perspectives for the manipulation of spin structures in metal-oxide heterostructures and devices.
利用Dy M₅和Ni L₃吸收边的共振X射线散射来探测外延LaNiO₃-DyScO₃超晶格中磁有序的温度和磁场依赖性。对于具有2个晶胞厚LaNiO₃层的超晶格，在100 K以下，Ni自旋系统中会形成一种相称的螺旋态。在冷却至T_ind = 18 K以下时，跨越LaNiO₃-DyScO₃界面的Dy-Ni交换相互作用会诱导界面Dy磁矩的共线磁有序，以及Ni自旋重新取向至由Dy的强磁晶各向异性所决定的方向。该转变可被3 T的外部磁场逆转。因此，稀土和过渡金属离子之间定制的交换相互作用为金属氧化物异质结构和器件中自旋结构的操控开辟了新的前景。
