title: Magnetic hardening induced by nonmagnetic organic molecules.
abstract: We reveal for the first time through a theoretical first-principles study that the adsorption of a nonmagnetic π-conjugated organic molecule on a ferromagnetic surface locally increases the strength of the magnetic exchange interaction between the magnetic atoms binding directly to the molecule. This magnetic hardening effect leads to the creation of a local molecular mediated magnetic unit with a stable magnetization direction and an enhanced barrier for the magnetization switching as compared to the clean surface. Remarkably, such a hybrid organic-ferromagnetic system exhibits also a spin-filter functionality with sharp spin-split molecularlike electronic features at the molecular site.
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute of Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Callsen
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute of Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: Vasile
authors.initials: V
authors.lastname: Caciuc
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute of Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: Nikolai
authors.initials: N
authors.lastname: Kiselev
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute of Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: Nicolae
authors.initials: N
authors.lastname: Atodiresei
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute of Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Blügel