Control of the magnetism of cobalt phthalocyanine by a ferromagnetic substrate

Annese, E.; Fujii, Jun; Vobornik, I.; Panaccione, G.; Rossi, G.

doi:10.1103/physrevb.84.174443

Cited by 51 publications

(57 citation statements)

References 40 publications

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“…5,6 Theoretical investigations have revealed that Fe OEP molecules are chemisorbed at ferromagnetic surfaces whereby the magnetic coupling is mediated by the N-atoms. 6 Transition metal-based porphyrin molecules have been studied intensively on ferromagnetic substrates focussing on the magnetic coupling between surface and molecule [5][6][7][8][9][10] and the influence of the anisotropy of the substrate on the magnetic properties of the molecule. Nonmagnetic substrates have been used to study spin and orbital magnetic anisotropies 11,12 as well as correlation and hybridization effects with the substrate.…”

Section: Introductionmentioning

confidence: 99%

Iron porphyrin molecules on Cu(001): Influence of adlayers and ligands on the magnetic properties

et al. 2013

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The structural and magnetic properties of Fe octaethylporphyrin (OEP) molecules on Cu(001) have been investigated by means of density functional theory (DFT) methods and X-ray absorption spectroscopy. The molecules have been adsorbed on the bare metal surface and on an oxygen-covered surface, which shows a √ 2 × 2 √ 2R45 • reconstruction. In order to allow for a direct comparison between magnetic moments obtained from sum-rule analysis and DFT we calculate the dipolar term 7 Tz , which is also important in view of the magnetic anisotropy of the molecule. The measured Xray magnetic circular dichroism shows a strong dependence on the photon incidence angle, which we could relate to a huge value of 7 Tz , e.g. on Cu(001) 7 Tz amounts to -2.07 µB for normal incidence leading to a reduction of the effective spin moment ms+7 Tz . Calculations have also been performed to study the influence of possible ligands such as Cl and O atoms on the magnetic properties of the molecule and the interaction between molecule and surface, because the experimental spectra display a clear dependence on the ligand, which is used to stabilize the molecule in the gas phase. Both types of ligands weaken the hybridization between surface and porphyrin molecule and change the magnetic spin state of the molecule, but the changes in the X-ray absorption are clearly related to residual Cl ligands.

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Section: Introductionmentioning

confidence: 99%

Iron porphyrin molecules on Cu(001): Influence of adlayers and ligands on the magnetic properties

et al. 2013

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“…This inferred alignment of Mn and Co magnetic moments underscores FM-coupling at room temperature of the Mn within MnPc to the underlying Co (ref. 9), as seen in other systems 9,14,15,17,18 .…”

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confidence: 88%

Exchange bias and room-temperature magnetic order in molecular layers

et al. 2015

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Molecular semiconductors may exhibit antiferromagnetic correlations well below room temperature. Although inorganic antiferromagnetic layers may exchange bias single-molecule magnets, the reciprocal effect of an antiferromagnetic molecular layer magnetically pinning an inorganic ferromagnetic layer through exchange bias has so far not been observed. We report on the magnetic interplay, extending beyond the interface, between a cobalt ferromagnetic layer and a paramagnetic organic manganese phthalocyanine (MnPc) layer. These ferromagnetic/organic interfaces are called spinterfaces because spin polarization arises on them. The robust magnetism of the Co/MnPc spinterface stabilizes antiferromagnetic ordering at room temperature within subsequent MnPc monolayers away from the interface. The inferred magnetic coupling strength is much larger than that found in similar bulk, thin or ultrathin systems. In addition, at lower temperature, the antiferromagnetic MnPc layer induces an exchange bias on the Co film, which is magnetically pinned. These findings create new routes towards designing organic spintronic devices.

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“…The molecules organize in two local lattices: rectangular with lattice parameters 1.6 × 1.6nm 2 and hexagonal lattice with a molecule−molecule distance of ∼1.53 nm 4. Figure 2(d) displays the STM image of 0.1 ML CoPc film deposited on the Fe 5-ML-thick film.…”

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confidence: 95%

CoPc 2D and 1D Arrangement on a Ferromagnetic Surface

et al. 2016

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We investigated the growth and electronic properties of Co-phthalocyanine (CoPc) molecule deposited on iron film with different structures (pseudomorph-fcc and bcc) and on iron nanowires by scanning tunnelling microscopy and X-ray absorption spectroscopy (XAS). CoPc molecules self-assemble in a two-dimensional (2D) arrangement with the molecular plane parallel to the iron surfaces, and the local order is lost after the first layer. The molecule-ferromagnet interaction causes the broadening of Co and N unoccupied molecular states as well as different electronic distribution of N states as a function of the atomic structure of iron surface. The ferromagnetic coupling between the molecule and the iron film is dominated by the electronic interaction between Co and the first Fe layer. CoPc 2D arrangement turns into 1D by using as a template the iron nanowire grown on a facet surface of oxidized Cu(332) surface. CoPc molecules interact weakly with the iron nanowires manifesting a substantial Co 3dz spectral feature in XAS spectrum and the possibility of a magnetic interaction between Co moment and iron nanowires. Both CoPc 2D and 1D arrangements can open up new interesting scenarios to tune the magnetic properties of hybrid interfaces involving metallorganic molecules.

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Control of the magnetism of cobalt phthalocyanine by a ferromagnetic substrate

Cited by 51 publications

References 40 publications

Iron porphyrin molecules on Cu(001): Influence of adlayers and ligands on the magnetic properties

Iron porphyrin molecules on Cu(001): Influence of adlayers and ligands on the magnetic properties

Exchange bias and room-temperature magnetic order in molecular layers

CoPc 2D and 1D Arrangement on a Ferromagnetic Surface

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