CoTPP molecules deposited on graphene/Ni (111): Quenching of the antiferromagnetic interaction induced by gold intercalation

Abstract

In this work, we investigated the effect of Au-intercalation on the magnetic coupling between a sub-monolayer of Co-Tetraphenylporphyrin molecules and a graphene-covered Ni(111) single crystal. Using x-ray absorption spectroscopy and x-ray magnetic circular dichroism, the element-specific magnetization and its field dependence were probed. Cobalt strongly couples antiferromagnetically to the nickel substrate, also through the graphene layer. The intercalation of graphene with gold leads to a complete removal of this coupling.

Interaction of ultra-thin CoTPP films on Fe(001) with oxygen: Interplay between chemistry, order, and magnetism

“…26 In the following, we consider the CoTPP/Fe(001)p(1 × 1)O system because Fe is one of the most important substrates for inorganic spintronics 27 and CoTPP, among the MTPP, a porphyrin carrying a non-null magnetic moment and consequently used as a prototypical molecule to study the interactions with different magnetic substrates. 17, 28,29 As we have recently shown, the CoTPP ML is magnetically coupled to the Fe(001)p(1 × 1)O substrate, even at RT. 29 In this work, we study the effect of exposing the 1 ML CoTPP/Fe(001)p(1 × 1)O system to an increasing amount of molecular oxygen by simultaneously monitoring its chemical modifications and magnetic behavior.…”

Heterometallic Co–Dy SMMs grafted on iron oxide nanoparticles

“…Molecular spintronic applications require that SMMs remain intact and retain their magnetic properties when deposited on a substrate. The use of organic spacers is not widespread, but it is understood that the decoupling between the magnetic surface and the SMM is a key factor, great success in this regard has been reported with the use of inorganic materials like MgO 8 or graphene 48 between the SMM and a metallic or magnetic surfaces. We show here that this can be easily achieved using an organic spacer between SMM and magnetic surface.…”

Molecular spintronics

“…For instance, the novel molecular materials and tailored hybrid interfaces described in Refs. [19][20][21][22]25, and 26 might enable the demonstration of unconventional devices, adding novel functionalities to conventional spintronics and providing a material platform for quantum computing. In this regard, we hope that the featured works will inspire new ideas and boost further investigations and that scientists active in different fields will enjoy the reading.…”

“…The Molecular Spintronics special topic in the Journal of Applied Physics offers an overview of the most active research areas currently under investigation in the broad field of molecular spintronics. In particular, featured topics include spin readout and manipulation in single-molecule magnets, [16][17][18] hybrid spin states and magnetic coupling at molecule/metal interfaces, [19][20][21][22] spin transport across ultrathin molecular monolayers 23 and molecular films with novel experimental techniques, 24 and novel promising materials for molecular spintronics such as organic radicals. 25,26 A particular emphasis is devoted to single-molecule spintronics for quantum computing, [16][17][18] with two works demonstrating the potential of one among the prototypical single-molecule magnets (TbPc 2 ) as quantum bits.…”