6533b852fe1ef96bd12ab5f0
RESEARCH PRODUCT
Beyond the Heisenberg Model: Anisotropic Exchange Interaction between a Cu-Tetraazaporphyrin Monolayer andFe3O4(100)
Michael MerzPeter NagelJulia KlankeIgor V. ShvetsKaterina MedjanikGerd SchönhenseHans-joachim ElmersEva RentschlerD. KutnyakhovStefan SchupplerSergey A. Krasnikovsubject
PhysicsCondensed Matter::Materials ScienceMagnetizationMagnetic momentCondensed matter physicsFerromagnetismMagnetic circular dichroismHeisenberg modelExchange interactionGeneral Physics and AstronomyAntiferromagnetismCondensed Matter::Strongly Correlated ElectronsSum rule in quantum mechanicsdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-03-25 | Physical Review Letters |