ICMAB-CSIC, Campus de UAB, 08193 Bellaterra, Spain.
Nanoscale. 2013 Apr 7;5(7):2990-8. doi: 10.1039/c3nr33346a.
The chemical composition and the magnetic structure of individual La0.7Sr0.3MnO3 (LSMO) ferromagnetic manganite epitaxial nanostructures less than 200 nm in width are explored using Photoemission Electron Microscopy (PEEM). X-ray absorption spectra (XAS) provide separate information on the surface and the bulk composition of the nanoislands and give evidence of Mn(2+) present on the surface of otherwise stoichiometric nanostructures. Ferromagnetic domains less than 70 nm are resolved using X-ray magnetic circular dichroism (XMCD), which allows for the detection of magnetic vortex states in both (001)LSMO square and (111)LSMO triangular manganite nanoislands. The evolution of single nanostructures under an in-plane magnetic field is seen to depend on the specific nanoisland size and geometry. In particular, PEEM XMCD imaging allows detecting opposite chiralities as well as a variety of magnetization behaviors for different nanoislands.
使用光发射电子显微镜（PEEM）研究了宽度小于 200nm 的单个 La0.7Sr0.3MnO3（LSMO）铁磁锰酸盐外延纳米结构的化学成分和磁结构。X 射线吸收光谱（XAS）分别提供了纳米岛表面和体成分的信息，并证明了在其他化学计量的纳米结构表面存在 Mn(2+)。使用 X 射线磁圆二色性（XMCD）分辨小于 70nm 的铁磁畴，这允许在（001）LSMO 正方形和（111）LSMO 三角形锰酸盐纳米岛中检测到磁涡旋状态。在面内磁场下单个纳米结构的演化被发现取决于特定纳米岛的大小和几何形状。特别是，PEEM XMCD 成像允许检测到相反的手性以及不同纳米岛的各种磁化行为。
