Annese Emilia, Di Santo Giovanni, Choueikani Fadi, Otero Edwige, Ohresser Philippe
ELETTRA - Sincrotrone Trieste S.C.p.A., SS 14 - km 163,5 in AREA Science Park, 34149 Trieste, Italy.
Programa de Engenharia Química, COPPE, Universidade Federal de Rio de Janeiro, 21941-901 Rio de Janeiro, RJ, Brazil.
ACS Omega. 2019 Mar 8;4(3):5076-5082. doi: 10.1021/acsomega.9b00214. eCollection 2019 Mar 31.
Metal-phthalocyanines are quasi-planar heterocyclic macrocycle molecules with a highly conjugated structure. They can be engineered at the molecular scale (central atom, ligand) to tailor new properties for organic spintronics devices. In this study, we evaluated the magnetic behavior of FePc in a ∼1 nm molecular film sandwiched between two ferromagnetic films: cobalt (bottom) and nickel (top). In the single interface, FePc in contact with a Co film is magnetically coupled with the inorganic film magnetization, though the relatively small Fe(Pc) X-ray magnetic circular dichroism (XMCD) signal in remanence, with respect to that observed in applied field of 6 T, suggests that a fraction of molecules in the organometallic film have their magnetic moment not aligned or antiparallel with respect to Co. When in contact with two interfaces, Fe(Pc) XMCD doubles, indicating that part of the Fe(Pc) are now aligned with the Ni topmost layer, saturated at 1 T. We discussed the relevance of the finding in terms of understanding and developing hybrid organic/inorganic spin devices.
金属酞菁是具有高度共轭结构的准平面杂环大环分子。它们可以在分子尺度（中心原子、配体）上进行设计，为有机自旋电子器件定制新特性。在本研究中，我们评估了夹在两个铁磁膜（底部为钴，顶部为镍）之间的约1纳米分子膜中FePc的磁行为。在单一界面中，与Co膜接触的FePc与无机膜的磁化强度磁耦合，尽管相对于在6 T外加磁场中观察到的信号，剩磁中相对较小的Fe(Pc) X射线磁圆二色性（XMCD）信号表明有机金属膜中的一部分分子的磁矩与Co不平行或反平行。当与两个界面接触时，Fe(Pc) XMCD翻倍，表明现在部分Fe(Pc)与在1 T时饱和的Ni最顶层对齐。我们从理解和开发有机/无机混合自旋器件的角度讨论了这一发现的相关性。
