title: Demonstration of a robust magnonic spin wave interferometer.
abstract: Magnonics is an emerging field dealing with ultralow power consumption logic circuits, in which the flow of spin waves, rather than electric charges, transmits and processes information. Waves, including spin waves, excel at encoding information via their phase using interference. This enables a number of inputs to be processed in one device, which offers the promise of multi-input multi-output logic gates. To realize such an integrated device, it is essential to demonstrate spin wave interferometers using spatially isotropic spin waves with high operational stability. However, spin wave reflection at the waveguide edge has previously limited the stability of interfering waves, precluding the use of isotropic spin waves, i.e., forward volume waves. Here, a spin wave absorber is demonstrated comprising a yttrium iron garnet waveguide partially covered by gold. This device is shown experimentally to be a robust spin wave interferometer using the forward volume mode, with a large ON/OFF isolation value of 13.7 dB even in magnetic fields over 30 Oe.
authors.affiliation: Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi 441-8580, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Kanazawa
authors.affiliation: Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi 441-8580, Japan.|JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
authors.forename: Taichi
authors.initials: T
authors.lastname: Goto
authors.affiliation: JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.|Department of Physics, Keio University, Yokohama 223-8522, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Sekiguchi
authors.affiliation: Faculty of Physics, Moscow State University, Leninskie Gory, Moscow 119992, Russia.
authors.forename: Alexander B
authors.initials: AB
authors.lastname: Granovsky
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors.forename: Caroline A
authors.initials: CA
authors.lastname: Ross
authors.affiliation: Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi 441-8580, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Takagi
authors.affiliation: Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi 441-8580, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Nakamura
authors.affiliation: Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi 441-8580, Japan.
authors.forename: Mitsuteru
authors.initials: M
authors.lastname: Inoue