Magnon detection using a ferroic collinear
multilayer spin valve
, Felix Fuhrmann
, Ulrike Ritzmann
, Vanessa Gall
, Tomohiko Niizeki
, Rafael Ramos
, Dazhi Hou
, Takashi Kikkawa
, Jairo Sinova
, Ulrich Nowak
, Eiji Saitoh
& Mathias Kläui
Information transport and processing by pure magnonic spin currents in insulators is a
promising alternative to conventional charge-current-driven spintronic devices. The absence
of Joule heating and reduced spin wave damping in insulating ferromagnets have been
suggested for implementing efﬁcient logic devices. After the successful demonstration of a
majority gate based on the superposition of spin waves, further components are required to
perform complex logic operations. Here, we report on magnetization orientation-dependent
spin current detection signals in collinear magnetic multilayers inspired by the functionality of
a conventional spin valve. In Y
|CoO|Co, we ﬁnd that the detection amplitude of spin
currents emitted by ferromagnetic resonance spin pumping depends on the relative align-
ment of the Y
and Co magnetization. This yields a spin valve-like behavior with an
amplitude change of 120% in our systems. We demonstrate the reliability of the effect and
identify its origin by both temperature-dependent and power-dependent measurements.
Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany.
Graduate School of Excellence Materials Science in Mainz, 55128
Department of Physics, University of Konstanz, 78457 Konstanz, Germany.
Advanced Institute for Materials Research, Tohoku
University, Sendai 980-8577, Japan.
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Center for Spintronics Research
Network, Tohoku University, Sendai 980-8577, Japan.
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan.
address: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China. Correspondence and requests for materials
should be addressed to M.Käu. (email: email@example.com)