Coherence and modality of driven interlayer-coupled magnetic vortices.

Abstract:

:The high-frequency dynamics of mode-coupled magnetic vortices have generated great interest for spintronic technologies, such as spin-torque nano-oscillators. While the spectroscopic characteristics of vortex oscillators have been reported, direct imaging of driven coupled magnetic quasi-particles is essential to the fundamental understanding of the dynamics involved. Here, we present the first direct imaging study of driven interlayer coaxial vortices in the dipolar- and indirect exchange-coupled regimes. Employing in situ high-frequency excitation with Lorentz microscopy, we directly observe the steady-state orbital amplitudes in real space with sub-5 nm spatial resolution. We discuss the unique frequency response of dipolar- and exchange-coupled vortex motion, wherein mode splitting and locking demonstrates large variations in coherent motion, as well as detail the resultant orbital amplitudes. This provides critical insights of the fundamental features of collective vortex-based microwave generators, such as their steady-state amplitudes, tunability and mode-coupled motion.

journal_name

Nat Commun

journal_title

Nature communications

authors

Pulecio JF,Warnicke P,Pollard SD,Arena DA,Zhu Y

doi

10.1038/ncomms4760

subject

Has Abstract

pub_date

2014-04-30 00:00:00

pages

3760

issn

2041-1723

pii

ncomms4760

journal_volume

5

pub_type

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