Superexchange pathways stabilize the magnetic coupling of MnPc with Co in a spin interface mediated by graphene
| Autor: | Maria Grazia Betti, Pierluigi Gargiani, Pierluigi Mondelli, Francesco Presel, Giulia Avvisati, Alessandro Baraldi |
|---|---|
| Přispěvatelé: | Avvisati, Giulia, Gargiani, Pierluigi, Mondelli, Pierluigi, Presel, Francesco, Baraldi, Alessandro, Betti, Maria Grazia |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
exchange interaction molecular magnets surfaces graphene magnetic anisotropy x-ray magnetic circular dichroism x-ray absorption spectroscopy Scanning tunneling microscopy | Nitrogen compounds | copper phthalocyanine magnetic coupling 02 engineering and technology Graphene MnPc molecules 01 natural sciences MnPc molecule law.invention law 0103 physical sciences Molecular orbital 010306 general physics magnetic anisotropy Condensed matter physics Magnetic circular dichroism graphene 021001 nanoscience & nanotechnology Inductive coupling Magnetic anisotropy X-ray magnetic circular dichroism Superexchange Electron configuration 0210 nano-technology |
| Zdroj: | Physical Review B 98 (2018). doi:10.1103/PhysRevB.98.115412 info:cnr-pdr/source/autori:Avvisati G.; Gargiani P.; Mondelli P.; Presel F.; Baraldi A.; Betti M.G./titolo:Superexchange pathways stabilize the magnetic coupling of MnPc with Co in a spin interface mediated by graphene/doi:10.1103%2FPhysRevB.98.115412/rivista:Physical Review B/anno:2018/pagina_da:/pagina_a:/intervallo_pagine:/volume:98 |
| DOI: | 10.1103/PhysRevB.98.115412 |
| Popis: | We investigate the magnetic response of a spin interface constituted by MnPc molecules adsorbed on graphene/Co and its robustness against thermal fluctuations by x-ray magnetic circular dichroism. Element-selective hysteresis loops reveal a remarkable antiferromagnetic coupling between MnPc and Co that is strong both in perpendicular and in-plane magnetic orientations, thanks to the magnetic anisotropy properties and electronic configuration of MnPc. The magnetic interaction between MnPc and Co is mediated by the molecular states and the graphene $\ensuremath{\pi}$ orbitals in a superexchange mechanism that allows a strong exchange coupling while the molecular orbitals symmetries are preserved by the graphene decoupling layer. Our results show that the strength and stability of the magnetic coupling between MnPc molecules and Co layer(s), intercalated at the graphene/Ir(111) interface, is further optimized by the open $3d$ shell of the central Mn ion. The magnetic properties are compared with analogous molecular spin interfaces with high thermal stability, paradigmatic examples to exploit in surface-supported molecular spin electronics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|