title: Anisotropic magnetoresistance state space of permalloy nanowires with domain wall pinning geometry.
abstract: The domain wall-related change in the anisotropic magnetoresistance in L-shaped permalloy nanowires is measured as a function of the magnitude and orientation of the applied magnetic field. The magnetoresistance curves, compiled into so-called domain wall magnetoresistance state space maps, are used to identify highly reproducible transitions between domain states. Magnetic force microscopy and micromagnetic modelling are correlated with the transport measurements of the devices in order to identify different magnetization states. Analysis allows to determine the optimal working parameters for specific devices, such as the minimal field required to switch magnetization or the most appropriate angle for maximal separation of the pinning/depinning fields. Moreover, the complete state space maps can be used to predict evolution of nanodevices in magnetic field without a need of additional electrical measurements and for repayable initialization of magnetic sensors into a well-specified state.
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK.
authors.forename: Héctor
authors.initials: H
authors.lastname: Corte-León
authors.affiliation: 1] Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, I-10135, Italy [2] Dipartimento Energia, Politecnico di Torino, Torino, I-10129, Italy.
authors.forename: Vahid
authors.initials: V
authors.lastname: Nabaei
authors.affiliation: Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, I-10135, Italy.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Manzin
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Fletcher
authors.affiliation: Physikalisch-Technische Bundesanstalt, Braunschweig, D-38116, Germany.
authors.forename: Patryk
authors.initials: P
authors.lastname: Krzysteczko
authors.affiliation: Physikalisch-Technische Bundesanstalt, Braunschweig, D-38116, Germany.
authors.forename: Hans W
authors.initials: HW
authors.lastname: Schumacher
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK.
authors.forename: Olga
authors.initials: O
authors.lastname: Kazakova