Engineering the magnetic coupling and anisotropy at the molecule–magnetic surface interface in molecular spintronic devices - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2016

Engineering the magnetic coupling and anisotropy at the molecule–magnetic surface interface in molecular spintronic devices

Yannick J. Dappe
Philippe Ohresser
Fadi Choueikani
  • Function : Author
  • PersonId : 871782
Edwige Otero

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)2 is strongly ferromagnetically coupled to the surface, while Ni(Pyipa)2 is 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.
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Origin : Publication funded by an institution

Dates and versions

hal-01414673 , version 1 (28-02-2024)

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Victoria E. Campbell, Monica Tonelli, Irene Cimatti, Jean-Baptiste Moussy, Ludovic Tortech, et al.. Engineering the magnetic coupling and anisotropy at the molecule–magnetic surface interface in molecular spintronic devices. Nature Communications, 2016, 7, pp.13646. ⟨10.1038/ncomms13646⟩. ⟨hal-01414673⟩
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