title: Quantitative measurement of the magnetic exchange interaction across a vacuum gap.
abstract: We demonstrate that magnetic exchange force spectroscopy allows for a quantitative determination of the distance-dependent magnetic exchange interaction across a vacuum gap. Experiments were performed on the antiferromagnetic Fe monolayer on W(001) with magnetically sensitive tips and compared to first-principles calculations performed for different cluster tip models. For stable tips, which can be distinguished from unstable tips by analyzing the dissipation signal, very good agreement with theory is observed.
authors.affiliation: Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Schmidt
authors.forename: C
authors.initials: C
authors.lastname: Lazo
authors.forename: U
authors.initials: U
authors.lastname: Kaiser
authors.forename: A
authors.initials: A
authors.lastname: Schwarz
authors.forename: S
authors.initials: S
authors.lastname: Heinze
authors.forename: R
authors.initials: R
authors.lastname: Wiesendanger