title: Field-free magnetization reversal by spin-Hall effect and exchange bias.
abstract: As the first magnetic random access memories are finding their way onto the market, an important issue remains to be solved: the current density required to write magnetic bits becomes prohibitively high as bit dimensions are reduced. Recently, spin-orbit torques and the spin-Hall effect in particular have attracted significant interest, as they enable magnetization reversal without high current densities running through the tunnel barrier. For perpendicularly magnetized layers, however, the technological implementation of the spin-Hall effect is hampered by the necessity of an in-plane magnetic field for deterministic switching. Here we interface a thin ferromagnetic layer with an anti-ferromagnetic material. An in-plane exchange bias is created and shown to enable field-free S HE-driven magnetization reversal of a perpendicularly magnetized Pt/Co/IrMn structure. Aside from the potential technological implications, our experiment provides additional insight into the local spin structure at the ferromagnetic/anti-ferromagnetic interface.
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.
authors.forename: A
authors.identifier: http://orcid.org/0000-0001-8490-280X
authors.initials: A
authors.lastname: van den Brink
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Vermijs
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.|SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette, France.
authors.forename: A
authors.initials: A
authors.lastname: Solignac
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Koo
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.
authors.forename: J T
authors.initials: JT
authors.lastname: Kohlhepp
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.
authors.forename: H J M
authors.initials: HJM
authors.lastname: Swagten
authors.affiliation: Eindhoven University of Technology, PO Box 513, Noord-Brabant, 5600 MB Eindhoven, The Netherlands.
authors.forename: B
authors.initials: B
authors.lastname: Koopmans