title: Engineering the magnetic coupling and anisotropy at the molecule-magnetic surface interface in molecular spintronic devices.
abstract: A challenge in molecular spintronics is to control the magnetic coupling between magnetic molecules and magnetic electrodes to build efficient devices. Here we show that the nature of the magnetic ion of anchored metal complexes highly impacts the exchange coupling of the molecules with magnetic substrates. Surface anchoring alters the magnetic anisotropy of the cobalt(II)-containing complex (Co(Pyipa)2), and results in blocking of its magnetization due to the presence of a magnetic hysteresis loop. In contrast, no hysteresis loop is observed in the isostructural nickel(II)-containing complex (Ni(Pyipa)2). Through XMCD experiments and theoretical calculations we find that Co(Pyipa)2is strongly ferromagnetically coupled to the surface, while Ni(Pyipa)2is either not coupled or weakly antiferromagnetically coupled to the substrate. These results highlight the importance of the synergistic effect that the electronic structure of a metal ion and the organic ligands has on the exchange interaction and anisotropy occurring at the molecule-electrode interface.
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France.
authors.forename: Victoria E
authors.initials: VE
authors.lastname: Campbell
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France.
authors.forename: Monica
authors.initials: M
authors.lastname: Tonelli
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France.
authors.forename: Irene
authors.initials: I
authors.lastname: Cimatti
authors.affiliation: SPEC, CEA, CNRS, Univesité Paris Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Moussy
authors.affiliation: IPCM, UMR CNRS 7201, UPMC, Université Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Ludovic
authors.initials: L
authors.lastname: Tortech
authors.affiliation: SPEC, CEA, CNRS, Univesité Paris Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: Yannick J
authors.initials: YJ
authors.lastname: Dappe
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Rivière
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France.
authors.forename: Régis
authors.initials: R
authors.lastname: Guillot
authors.affiliation: Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Delprat
authors.affiliation: Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France.
authors.forename: Richard
authors.initials: R
authors.lastname: Mattana
authors.affiliation: Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Seneor
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Ohresser
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France.
authors.forename: Fadi
authors.initials: F
authors.lastname: Choueikani
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France.
authors.forename: Edwige
authors.initials: E
authors.lastname: Otero
authors.affiliation: Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France.
authors.forename: Florian
authors.initials: F
authors.lastname: Koprowiak
authors.affiliation: Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France.
authors.forename: Vijay Gopal
authors.initials: VG
authors.lastname: Chilkuri
authors.affiliation: Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Suaud
authors.affiliation: Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Guihéry
authors.affiliation: PSL Research University, Chimie ParisTech-CNRS, Institut de Recherche de Chimie Paris, F-75005 Paris, France.
authors.forename: Anouk
authors.initials: A
authors.lastname: Galtayries
authors.affiliation: CEA/DEN/DANS/DPC/SCCME, Laboratoire d'Etude de la Corrosion Aqueuse, F-91191 Gif-sur-Yvette, France.
authors.forename: Frederic
authors.initials: F
authors.lastname: Miserque
authors.affiliation: IMPMC-CNRS, Université Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Arrio
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France.|IMPMC-CNRS, Université Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Sainctavit
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France.
authors.forename: Talal
authors.identifier: 0000-0002-9311-3463
authors.initials: T
authors.lastname: Mallah