Spin-resolved two-photon photoemission study of the surface resonance state on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Co</mml:mi><mml:mo>∕</mml:mo><mml:mi>Cu</mml:mi><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>

Andreyev, O.; Koroteev, Yuri M.; Albaneda, M. Sánchez; Cinchetti, Mirko; Bihlmayer, Gustav; Chulkov, Eugene V.; Lange, J.; Steeb, Felix; Bauer, Michael; Echenique, Pedro M.; Blügel, Stefan; Aeschlimann, Martin

doi:10.1103/physrevb.74.195416

Cited by 35 publications

(34 citation statements)

References 24 publications

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“…The 3.5 nm thin Co films were deposited by electron beam epitaxy with an Omicron EFM-3 evaporator on a Cu(001) single crystal at a pressure of 10 −10 mbar. Afterwards the sample was annealed at 370 K. This results in a metastable tetragonally distorted Co fcc structure with an in-plane magnetic uniaxial anisotropy along the (110) direction of copper [27]. Alq 3 (99.995% pure) was purchased from Sigma Aldrich.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt

et al. 2014

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It was recently established that spin injection from a ferromagnetic metal into an organic semiconductor depends largely on the formation of hybrid interface states. Here we investigate whether the magnetic properties of the interface between cobalt and tris(8-hydroxyquinolinato)-Al(III) (Alq 3 ), the most prominent molecular candidate for organic spin-valve devices, can be modified by substituting the aluminum atom with either gallium or indium. The electronic structure of Alq 3 , Gaq 3 , and Inq 3 and the properties of their interfaces with ferromagnetic cobalt are probed experimentally, by using different photoemission spectroscopy methods, and theoretically, through density functional theory calculations. For all cases, the results highlight the presence of spin-polarized interface states. However no striking difference between the properties of the various molecules and interfaces is observed. This is a consequence of the fact that the molecules frontier orbitals are mainly localized on the ligands and they show only a negligible contribution coming from the metal ion.

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Section: Experimental Methodsmentioning

confidence: 99%

Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt

et al. 2014

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“…19 For the SP-UPS measurements, iron films 100 ML thick were deposited on a clean Cu(001) substrate under conditions similar to those reported in Ref. 20. The iron material (GoodFellow, 99.99% purity) was evaporated by electron bombardment at a deposition rate of 1 ML/min at a pressure of less than 1 × 10 −9 mbar.…”

Section: Experimental Methodsmentioning

confidence: 99%

Spin scattering and spin-polarized hybrid interface states at a metal-organic interface

et al. 2011

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Spin scattering at the interface formed between metallic Fe and Cu-phthalocyanine molecules is investigated by spin-polarized scanning tunneling spectroscopy and spin-resolved photoemission. The results are interpreted using first-principles electronic structure theory. The combination of experimental and theoretical techniques allows us to shed light on the role of hybrid interface states for the spin scattering. We show that Cu-phthalocyanine acts, via hybrid interface states, as a local spin filter up to room temperature both below and above the Fermi energy, E F . At the same time, the molecule behaves as a featureless scattering barrier in a region of about 1 eV around E F . Similar properties are found for both single molecules and self-assembled molecular layers, so that the acquired microscopic knowledge can be transferred to operating devices.

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“…A full characterization of the thin cobalt films is reported in Ref. 9 . The temperature-dependent measurements presented in the next session were performed following scheme M1.…”

Section: Methodsmentioning

confidence: 99%

Spin properties of interfaces with organic semiconductors studied by spin- and time-resolved two-photon photoemission

Cinchetti

Koffler

Steil

et al. 2011

Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV

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We review our recent work in the field of organic spintronics, and show that the spin-and time-resolved twophoton photoemission (STR-2PPE) technique can be used to obtain quantitative information about the spindependent properties of hybrid organic-inorganic interfaces, as well as about the spin-dependent transport in organic semiconductors. In addition, we present STR-2PPE measurements performed on the Co-copper phthalocyanine (CuPc) system at different temperatures to investigate the microscopic processes repsonsible for the spin-polarization decay in organic semiconductors and at interfaces with such materials. We found no significant temperature dependence of the spin-injection efficiency across the Co-CuPc interface as well as of the spin-polarization decay length in CuPc .

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Spin-resolved two-photon photoemission study of the surface resonance state onCo∕Cu(001)

Cited by 35 publications

References 24 publications

Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt

Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt

Spin scattering and spin-polarized hybrid interface states at a metal-organic interface

Spin properties of interfaces with organic semiconductors studied by spin- and time-resolved two-photon photoemission

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