title: Magnetic thin-film insulator with ultra-low spin wave damping for coherent nanomagnonics.
abstract: Wave control in the solid state has opened new avenues in modern information technology. Surface-acoustic-wave-based devices are found as mass market products in 100 millions of cellular phones. Spin waves (magnons) would offer a boost in today's data handling and security implementations, i.e., image processing and speech recognition. However, nanomagnonic devices realized so far suffer from the relatively short damping length in the metallic ferromagnets amounting to a few 10 micrometers typically. Here we demonstrate that nm-thick YIG films overcome the damping chasm. Using a conventional coplanar waveguide we excite a large series of short-wavelength spin waves (SWs). From the data we estimate a macroscopic of damping length of about 600 micrometers. The intrinsic damping parameter suggests even a record value about 1 mm allowing for magnonics-based nanotechnology with ultra-low damping. In addition, SWs at large wave vector are found to exhibit the non-reciprocal properties relevant for new concepts in nanoscale SW-based logics. We expect our results to provide the basis for coherent data processing with SWs at GHz rates and in large arrays of cellular magnetic arrays, thereby boosting the envisioned image processing and speech recognition.
authors.affiliation: Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching b. München, Germany.
authors.forename: Haiming
authors.initials: H
authors.lastname: Yu
authors.affiliation: Unité Mixte de Physique CNRS/Thales and Université Paris-Sud, 1 avenue Augustin Fresnel, Palaiseau, France.
authors.forename: O d'Allivy
authors.initials: Od
authors.lastname: Kelly
authors.affiliation: Unité Mixte de Physique CNRS/Thales and Université Paris-Sud, 1 avenue Augustin Fresnel, Palaiseau, France.
authors.forename: V
authors.initials: V
authors.lastname: Cros
authors.affiliation: Unité Mixte de Physique CNRS/Thales and Université Paris-Sud, 1 avenue Augustin Fresnel, Palaiseau, France.
authors.forename: R
authors.initials: R
authors.lastname: Bernard
authors.affiliation: Unité Mixte de Physique CNRS/Thales and Université Paris-Sud, 1 avenue Augustin Fresnel, Palaiseau, France.
authors.forename: P
authors.initials: P
authors.lastname: Bortolotti
authors.affiliation: Unité Mixte de Physique CNRS/Thales and Université Paris-Sud, 1 avenue Augustin Fresnel, 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 b. 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 b. München, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Huber
authors.affiliation: Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching b. München, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Stasinopoulos
authors.affiliation: 1] Physik Department E10, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching b. München, Germany [2] Institut des Matériaux, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Grundler