title: Approaching soft X-ray wavelengths in nanomagnet-based microwave technology.
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.
authors.affiliation: Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching bei München, Germany.|Fert Beijing Institute, School of Electronic and Information Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China.
authors.forename: Haiming
authors.initials: H
authors.lastname: Yu
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors.forename: O
authors.initials: O
authors.lastname: d' Allivy Kelly
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors.forename: V
authors.initials: V
authors.lastname: Cros
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors.forename: R
authors.initials: R
authors.lastname: Bernard
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors.forename: P
authors.initials: P
authors.lastname: Bortolotti
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors.forename: A
authors.initials: A
authors.lastname: Anane
authors.affiliation: Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching bei München, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Brandl
authors.affiliation: Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching bei München, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Heimbach
authors.affiliation: Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching bei München, Germany.|Laboratory of Nanoscale Magnetic Materials and Magnonics, Institute of Materials, School of Engineering, École Polytechnique Fédérale de Lausanne, STI-IMX-LMGN, Station 17, CH-1015 Lausanne, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Grundler