Approaching soft X-ray wavelengths in nanomagnet-based microwave technology

Haiming Yu (), O. d’ Allivy Kelly, V. Cros, R. Bernard, P. Bortolotti, A. Anane, F. Brandl, F. Heimbach and D. Grundler ()
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Haiming Yu: Technische Universität München
O. d’ Allivy Kelly: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay
V. Cros: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay
R. Bernard: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay
P. Bortolotti: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay
A. Anane: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay
F. Brandl: Technische Universität München
F. Heimbach: Technische Universität München
D. Grundler: Technische Universität München

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Seven decades after the discovery of collective spin excitations in microwave-irradiated ferromagnets, there has been a rebirth of magnonics. However, magnetic nanodevices will enable smart GHz-to-THz devices at low power consumption only, if such spin waves (magnons) are generated and manipulated on the sub-100 nm scale. Here we show how magnons with a wavelength of a few 10 nm are exploited by combining the functionality of insulating yttrium iron garnet and nanodisks from different ferromagnets. We demonstrate magnonic devices at wavelengths of 88 nm written/read by conventional coplanar waveguides. Our microwave-to-magnon transducers are reconfigurable and thereby provide additional functionalities. The results pave the way for a multi-functional GHz technology with unprecedented miniaturization exploiting nanoscale wavelengths that are otherwise relevant for soft X-rays. Nanomagnonics integrated with broadband microwave circuitry offer applications that are wide ranging, from nanoscale microwave components to nonlinear data processing, image reconstruction and wave-based logic.

Date: 2016
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DOI: 10.1038/ncomms11255

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