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Domain Wall Based Spin-Hall Nano-Oscillators

Journal article
Authors N. Sato
K. Schultheiss
L. Körber
N. Puwenberg
T. Mühl
Ahmad Awad
S. S.P.K. Arekapudi
O. Hellwig
J. Fassbender
H. Schultheiss
Published in Physical Review Letters
Volume 123
ISSN 00319007
Publication year 2019
Published at Department of Physics (GU)
Language en
Keywords Domain walls, Spin Hall effect, Spin current, Spin transfer torque, Spin waves
Subject categories Nano Technology, Magnetism, Atom and Molecular Physics and Optics, Electrical Engineering, Electronic Engineering, Information Engineering

Abstract

© 2019 American Physical Society. In the last decade, two revolutionary concepts in nanomagnetism emerged from research for storage technologies and advanced information processing. The first suggests the use of magnetic domain walls in ferromagnetic nanowires to permanently store information in domain-wall racetrack memories. The second proposes a hardware realization of neuromorphic computing in nanomagnets using nonlinear magnetic oscillations in the gigahertz range. Both ideas originate from the transfer of angular momentum from conduction electrons to localized spins in ferromagnets, either to push data encoded in domain walls along nanowires or to sustain magnetic oscillations in artificial neurones. Even though both concepts share a common ground, they live on very different timescales which rendered them incompatible so far. Here, we bridge both ideas by demonstrating the excitation of magnetic auto-oscillations inside nanoscale domain walls using pure spin currents. This Letter will shed light on the current characteristic and spatial distribution of the excited auto-oscillations.

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