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Nat Nanotechnol. 2014 Jul;9(7):509-13. doi: 10.1038/nnano.2014.88. Epub 2014 May 11.

Nanomagnonic devices based on the spin-transfer torque.

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Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
Department of Physics, University of Muenster, 48149 Muenster, Germany.
1] Department of Physics, University of Muenster, 48149 Muenster, Germany [2] Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041, Russia.


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.

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