• Beyond the Heisenberg model: Anisotropic exchange interaction between a Cu-tetraazaporphyrin monolayer and Fe3O4(100)

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    PhysRevLett.110.137202.pdf (727.32 KB)

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    2013

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    Klanke, J., Rentschler, E., Medjanik, K., Kutnyakhov, D., Schonhense, G., Krasnikov, S., Shvets, I.V., (...), Elmers, H.J., Beyond the Heisenberg model: Anisotropic exchange interaction between a Cu-tetraazaporphyrin monolayer and Fe3O4(100), Physical Review Letters, 110, 3, 2013, art. no. 137202

    Abstract

    The exchange coupling of a single spin localized at the central ion of Cu-tetraazaporphyrin on a magnetite(100) surface has been studied using x-ray magnetic circular dichroism (XMCD). Sum rule analysis of the XMCD spectra results in Cu spin and orbital magnetic moments as a function of the applied external field at low temperatures (20 K). The exchange coupling is positive for magnetization direction perpendicular to the surface (ferromagnetic) while it is negative for in-plane magnetization direction (antiferromagnetic). We attribute the anisotropy of the Heisenberg exchange coupling to an orbitally dependent exchange Hamiltonian.

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    http://hdl.handle.net/2262/66686

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    Keywords

    in-plane magnetization
    Author's Homepage: http://people.tcd.ie/ivchvets

    Author: SHVETS, IGOR

    Type of material: Journal Article