title: Emergence of spin-orbit fields in magnetotransport of quasi-two-dimensional iron on gallium arsenide.
abstract: The desire for higher information capacities drives the components of electronic devices to ever smaller dimensions so that device properties are determined increasingly more by interfaces than by the bulk structure of the constituent materials. Spintronic devices, especially, benefit from the presence of interfaces--the reduced structural symmetry creates emergent spin-orbit fields that offer novel possibilities to control device functionalities. But where does the bulk end, and the interface begin? Here we trace the interface-to-bulk transition, and follow the emergence of the interfacial spin-orbit fields, in the conducting states of a few monolayers of iron on top of gallium arsenide. We observe the transition from the interface- to bulk-induced lateral crystalline magnetoanisotropy, each having a characteristic symmetry pattern, as the epitaxially grown iron channel increases from four to eight monolayers. Setting the upper limit on the width of the interface-imprinted conducting channel is an important step towards an active control of interfacial spin-orbit fields.
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Hupfauer
authors.affiliation: Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Matos-Abiague
authors.affiliation: Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Gmitra
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Schiller
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Loher
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Bougeard
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: C H
authors.initials: CH
authors.lastname: Back
authors.affiliation: Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Fabian
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Weiss