The compensated magnetic order and characteristic terahertz frequencies of antiferromagnetic materials make them promising candidates to develop a new class of robust, ultrafast spintronic devices. The manipulation of antiferromagnetic spin-waves in thin films is anticipated to lead to new exotic phenomena such as spin-superfluidity, requiring an efficient propagation of spin-waves in thin films. However, the reported decay length in thin films has so far been limited to a few nanometers. In this work, we achieve efficient spin-wave propagation over micrometer distances in thin films of the insulating antiferromagnet hematite with large magnetic domains while evidencing much shorter attenuation lengths in multidomain thin films. Through transport and magnetic imaging, we determine the role of the magnetic domain structure and spin-wave scattering at domain walls to govern the transport. We manipulate the spin transport by tailoring the domain configuration through field cycle training. For the appropriate crystalline orientation, zero-field spin transport is achieved across micrometers, as required for device integration.

Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology NO 7491 Trondheim Norway

Department of Applied Physics Eindhoven University of Technology P O Box 513 5600 MB Eindhoven The Netherlands

Department of Materials Science and Engineering Technion Israel Institute of Technology Haifa 32000 Israel

Graduate School of Excellence Materials Science in Mainz Staudinger Weg 9 55128 Mainz Germany

Helmholtz Zentrum Berlin für Materialien und Energie Albert Einstein Strasse 15 D 12489 Berlin Germany

Institut für Physik Johannes Gutenberg Universität Mainz 55099 Mainz Germany

Institute for Theoretical Physics Utrecht University Princetonplein 5 3584 CC Utrecht The Netherlands

Institute of Physics ASCR Cukrovarnicka 10 162 53 Praha 6 Czech Republic

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