title: Magnetic phase control in monolayer films by substrate tuning.
abstract: We propose tailoring exchange interactions in magnetic monolayer films by tuning the adjacent nonmagnetic substrate. As an example, we demonstrate a ferromagnetic-antiferromagnetic phase transition for one monolayer Fe on a Ta(x)W(1-x)(001) surface as a function of the Ta concentration. At the critical Ta concentration, the nearest-neighbor exchange interaction is small and the magnetic phase space is dramatically broadened. Complex magnetic order such as spin spirals, multiple-Q, or even disordered local moment states can occur, offering the possibility of storing information in terms of ferromagnetic dots in an otherwise zero-magnetization state matrix.
authors.affiliation: Institute of Applied Physics and Microstructure Research Center, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany. pferrian@physnet.uni-hamburg.de
authors.forename: P
authors.initials: P
authors.lastname: Ferriani
authors.forename: I
authors.initials: I
authors.lastname: Turek
authors.forename: S
authors.initials: S
authors.lastname: Heinze
authors.forename: G
authors.initials: G
authors.lastname: Bihlmayer
authors.forename: S
authors.initials: S
authors.lastname: Blügel