The interface spin coupling mechanism is studied in a hybrid structure made of Fe phthalocyanine molecules sublimed in ultrahigh vacuum on graphene grown on the magnetic substrate Ni(111). By using synchrotron X-ray magnetic circular dichroism, the field-dependent magnetization of the isolated FePc molecules and of the Ni substrate has been measured at low temperature (8 K). Along with density functional theory calculations, the role of the graphene interlayer in transmitting the magnetic coupling is addressed. Both experiments and theory show a ferromagnetic coupling between the molecules and the substrate which is weakened by the insertion of graphene. DFT calculations indicate that the key role is played by the π orbitals of graphene, which hybridize with the underlying magnetic Ni, giving rise to a sizable spin polarized continuum at the molecular interface. The resulting overlap with the Fe orbitals favors a direct coupling of ferromagnetic nature, as evidenced by our spin density distribution plots.

Ferromagnetic Exchange Coupling between Fe Phthalocyanine and Ni(111) Surface Mediated by the Extended States of Graphene / Candini, Andrea; Bellini, Valerio; Klar, David; Corradini, Valdis; Biagi, Roberto; DE RENZI, Valentina; Kummer, Kurt; Brookes, Nicholas B.; DEL PENNINO, Umberto; Wende, Heiko; Affronte, Marco. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - STAMPA. - 118:(2014), pp. 17670-17676. [10.1021/jp5041663]

Ferromagnetic Exchange Coupling between Fe Phthalocyanine and Ni(111) Surface Mediated by the Extended States of Graphene

CANDINI, Andrea;BELLINI, Valerio;CORRADINI, Valdis;BIAGI, Roberto;DE RENZI, Valentina;DEL PENNINO, Umberto;AFFRONTE, Marco
2014-01-01

Abstract

The interface spin coupling mechanism is studied in a hybrid structure made of Fe phthalocyanine molecules sublimed in ultrahigh vacuum on graphene grown on the magnetic substrate Ni(111). By using synchrotron X-ray magnetic circular dichroism, the field-dependent magnetization of the isolated FePc molecules and of the Ni substrate has been measured at low temperature (8 K). Along with density functional theory calculations, the role of the graphene interlayer in transmitting the magnetic coupling is addressed. Both experiments and theory show a ferromagnetic coupling between the molecules and the substrate which is weakened by the insertion of graphene. DFT calculations indicate that the key role is played by the π orbitals of graphene, which hybridize with the underlying magnetic Ni, giving rise to a sizable spin polarized continuum at the molecular interface. The resulting overlap with the Fe orbitals favors a direct coupling of ferromagnetic nature, as evidenced by our spin density distribution plots.
118
17670
17676
Ferromagnetic Exchange Coupling between Fe Phthalocyanine and Ni(111) Surface Mediated by the Extended States of Graphene / Candini, Andrea; Bellini, Valerio; Klar, David; Corradini, Valdis; Biagi, Roberto; DE RENZI, Valentina; Kummer, Kurt; Brookes, Nicholas B.; DEL PENNINO, Umberto; Wende, Heiko; Affronte, Marco. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - STAMPA. - 118:(2014), pp. 17670-17676. [10.1021/jp5041663]
Candini, Andrea; Bellini, Valerio; Klar, David; Corradini, Valdis; Biagi, Roberto; DE RENZI, Valentina; Kummer, Kurt; Brookes, Nicholas B.; DEL PENNINO, Umberto; Wende, Heiko; Affronte, Marco
File in questo prodotto:
File Dimensione Formato  
Ferromagnetic Exchange Coupling between Fe Phthalocyanine and Ni(111) Surface Mediated by the Extended States of Graphene - J Phys Chem C 2014.pdf

Accesso riservato

Tipologia: Versione originale dell'autore proposta per la pubblicazione
Dimensione 4 MB
Formato Adobe PDF
4 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1060168
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 30
social impact