We report an advanced organic spin-interface architecture with magnetic remanence at room temperature, constituted by metal phthalocyanine molecules magnetically coupled with Co layer(s), mediated by graphene. Fe- and Cu-phthalocyanines assembled on graphene/Co have identical structural configurations, but FePc couples antiferromagnetically with Co up to room temperature, while CuPc couples ferromagnetically with weaker coupling and thermal stability, as deduced by element-selective X-ray magnetic circular dichroic signals. The robust antiferromagnetic coupling is stabilized by a superexchange interaction, driven by the out-of-plane molecular orbitals responsible of the magnetic ground state and electronically decoupled from the underlying metal via the graphene layer, as confirmed by ab initio theoretical predictions. These archetypal spin interfaces can be prototypes to demonstrate how antiferromagnetic and/or ferromagnetic coupling can be optimized by selecting the molecular orbital symmetry.

Ferromagnetic and antiferromagnetic coupling of spin molecular interfaces with high thermal stability / Avvisati, Giulia; Cardoso, Claudia; Varsano, Daniele; Ferretti, Andrea; Gargiani, Pierluigi; Betti, Maria Grazia. - In: NANO LETTERS. - ISSN 1530-6984. - 18:4(2018), pp. 2268-2273. [10.1021/acs.nanolett.7b04836]

Ferromagnetic and antiferromagnetic coupling of spin molecular interfaces with high thermal stability

Avvisati, Giulia;Betti, Maria Grazia
2018

Abstract

We report an advanced organic spin-interface architecture with magnetic remanence at room temperature, constituted by metal phthalocyanine molecules magnetically coupled with Co layer(s), mediated by graphene. Fe- and Cu-phthalocyanines assembled on graphene/Co have identical structural configurations, but FePc couples antiferromagnetically with Co up to room temperature, while CuPc couples ferromagnetically with weaker coupling and thermal stability, as deduced by element-selective X-ray magnetic circular dichroic signals. The robust antiferromagnetic coupling is stabilized by a superexchange interaction, driven by the out-of-plane molecular orbitals responsible of the magnetic ground state and electronically decoupled from the underlying metal via the graphene layer, as confirmed by ab initio theoretical predictions. These archetypal spin interfaces can be prototypes to demonstrate how antiferromagnetic and/or ferromagnetic coupling can be optimized by selecting the molecular orbital symmetry.
2018
density functional theory; Spin interface; superexchange interaction; X-ray magnetic circular dichroism; Bioengineering; Chemistry (all); Materials Science (all); Condensed Matter Physics; Mechanical Engineering
01 Pubblicazione su rivista::01f Lettera, Nota
Ferromagnetic and antiferromagnetic coupling of spin molecular interfaces with high thermal stability / Avvisati, Giulia; Cardoso, Claudia; Varsano, Daniele; Ferretti, Andrea; Gargiani, Pierluigi; Betti, Maria Grazia. - In: NANO LETTERS. - ISSN 1530-6984. - 18:4(2018), pp. 2268-2273. [10.1021/acs.nanolett.7b04836]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1113691
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