High Spin Polarization at Ferromagnetic Metal–Organic Interfaces: A Generic Property

Djeghloul, F.; Gruber, Manuel; Urbain, E.; Xenioti, Dimitra; Joly, L.; Boukari, S.; Arabski, J.; Bulou, Hervé; Scheurer, F.; Bertran, F.; Fèvre, P. Le; Taleb‐Ibrahimi, A.; Wulfhekel, Wulf; Garreau, G.; Hajjar‐Garreau, Samar; Wetzel, P.; Alouani, M.; Beaurepaire, E.; Bowen, M.; Weber, W.

doi:10.1021/acs.jpclett.6b01112

Cited by 74 publications

(104 citation statements)

References 42 publications

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“…The current understanding is that the hybridization between 3d ferromagnets and π-conjugated molecules leads univocally to the inversion of the spin-polarization sign at the interface 19,[43][44][45] . In a recent comprehensive study based on spin-resolved photoemission, experimental evidence was provided to show that the presence of highly spin-polarized HISs is a very general phenomenon that does not even require the presence of π electrons in the isolated molecule, or a fully occupied majority d band in the 3d ferromagnet (strong ferromagnetism) 46 . Together with molecules evaporated in ultrahigh-vacuum conditions, significant work has also been developed on the use of different self-assembled monolayers on ferromagnetic materials, offering a perspective of molecular hybridization in an environment closer to established industrial processes such as inkjet printing and roll-to-roll coating [47][48][49][50] .…”

Section: The Molecular Sidementioning

confidence: 99%

Activating the molecular spinterface

2017

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The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba-Edelstein effect and the spin-momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.

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Section: The Molecular Sidementioning

confidence: 99%

Activating the molecular spinterface

2017

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“…In the past few years molecular spintronics [1] research has witnessed a fast developing interest in the investigation and functionalization of organic-ferromagnetic interfaces [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Major achievements in the field include the detection of the inversion of the spin-polarization above single molecules deposited on magnetic surfaces [7,8,12,16], the measurement of interface magnetoresistance due to the formation of a hybrid interface magnetic layer [11], and the time-resolved occupation analysis of hybrid interface states acting as spindependent electron traps [10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic subunits within a single molecule–surface hybrid

et al. 2017

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Magnetic molecule-surface hybrids are ideal building blocks for molecular spintronic devices due to their appealing tailorable magnetic properties and nanoscale size. So far, assemblies of interacting molecular-surface hybrids needed for spintronic functionality were generated by depositing aromatic molecules onto transition-metal surfaces, resulting in a random arrangement of hybrid magnets due to the inherent and strong hybridization. Here, we demonstrate the formation of multiple intramolecular subunits within a single molecule-surface hybrid by means of spin-polarized scanning tunneling microscopy experiments and ab initio density functional theory calculations. This novel effect is realized by depositing a polycyclic aromatic molecule on a magnetic surface. A highly asymmetric chiral adsorption position induces different structural, electronic, and magnetic properties in each aromatic ring of the molecule. In particular, the induced molecular spin polarization near the Fermi energy varies among the rings due to site-and spin-dependent molecule-surface hybridization. Our results showcase a possible organic chemistry route of tailoring geometrically welldefined assemblies of magnetically distinguishable subunits in molecule-surface hybrids.

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“…Such effects can lead to magnetic hardening or softening of the newly formed unit consisting of the chemisorbed molecule and its direct metal neighbors 19,23,24 . Since such new hybrid systems promise unique magnetic functionalities, they are currently studied intensively 19,21,[25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Quantum interference effects in molecular spin hybrids

et al. 2017

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We have studied by means of low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) single molecular spin hybrids formed upon chemisorbing a polycyclic aromatic, 3-fold symmetric hydrocarbon molecule on Co(111) nanoislands. The spin-dependent hybridization between the Co d-states and the π-orbitals of the molecule leads to a spin-imbalanced electronic structure of the chemisorbed organic molecule. Spin-sensitive measurements reveal that the spin polarization shows intramolecular variations among the different aromatic rings in spite of the highly symmetric adsorption geometry promoted by symmetry matching of the 3-fold symmetric molecule and the 6-fold symmetric Co(111) lattice. Hence, the varying degree of spin polarization on the organic molecule does not stem from a different hybridization of the aromatic rings with the Co atoms, but is proposed to be a consequence of the superposition of the spin polarization of the molecule and the spatially modulated spin polarization of the spin-dependent quantum interference pattern of the Co(111) surface state.

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High Spin Polarization at Ferromagnetic Metal–Organic Interfaces: A Generic Property

Cited by 74 publications

References 42 publications

Activating the molecular spinterface

Activating the molecular spinterface

Magnetic subunits within a single molecule–surface hybrid

Quantum interference effects in molecular spin hybrids

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