title: Nanomagnonic devices based on the spin-transfer torque.
abstract: Magnonics is based on signal transmission and processing by spin waves (or their quanta, called magnons) propagating in a magnetic medium. In the same way as nanoplasmonics makes use of metallic nanostructures to confine and guide optical-frequency plasmon-polaritons, nanomagnonics uses nanoscale magnetic waveguides to control the propagation of spin waves. Recent advances in the physics of nanomagnetism, such as the discovery of spin-transfer torque, have created possibilities for nanomagnonics. In particular, it was recently demonstrated that nanocontact spin-torque devices can radiate spin waves, serving as local nanoscale sources of signals for magnonic applications. However, the integration of spin-torque sources with nanoscale magnetic waveguides, which is necessary for the implementation of integrated spin-torque magnonic circuits, has not been achieved to date. Here, we suggest and experimentally demonstrate a new approach to this integration, utilizing dipolar field-induced magnonic nanowaveguides. The waveguides exhibit good spectral matching with spin-torque nano-oscillators and enable efficient directional transmission of spin waves. Our results provide a practical route for the implementation of integrated magnonic circuits utilizing spin transfer.
authors.affiliation: Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
authors.forename: S
authors.initials: S
authors.lastname: Urazhdin
authors.affiliation: Department of Physics, University of Muenster, 48149 Muenster, Germany.
authors.forename: V E
authors.initials: VE
authors.lastname: Demidov
authors.affiliation: Department of Physics, University of Muenster, 48149 Muenster, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Ulrichs
authors.affiliation: Department of Physics, University of Muenster, 48149 Muenster, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Kendziorczyk
authors.affiliation: Department of Physics, University of Muenster, 48149 Muenster, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Kuhn
authors.affiliation: Department of Physics, University of Muenster, 48149 Muenster, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Leuthold
authors.affiliation: Department of Physics, University of Muenster, 48149 Muenster, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Wilde
authors.affiliation: 1] Department of Physics, University of Muenster, 48149 Muenster, Germany [2] Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041, Russia.
authors.forename: S O
authors.initials: SO
authors.lastname: Demokritov