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      Static and Dynamic Magnetic Properties of Single-Crystalline Yttrium Iron Garnet Films Epitaxially Grown on Three Garnet Substrates

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          Magnon spintronics

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            YIG magnonics

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              Spin pumping at the magnetic insulator (YIG)/normal metal (Au) interfaces.

              Spin injection across the ferrimagnetic insulator (YIG)/normal metal (Au) interface was studied by ferromagnetic resonance. The spin mixing conductance was determined by comparing the Gilbert damping in bare YIG films with those covered by a Au/Fe/Au structure. The Fe layer in Au/Fe/Au acted as a spin sink as displayed by an increased Gilbert damping parameter α compared to that in the bare YIG. In particular, for the 9.0  nm  YIG/2.0 nm Au/4.3 nm Fe/6.1 nm Au structure, the YIG and Fe films were coupled by an interlayer exchange coupling, and the exchange coupled YIG exhibited an increased Gilbert damping compared to the bare YIG. This relationship between static and dynamic coupling provides direct evidence for spin pumping. The transfer of spin momentum across the YIG interface is surprisingly efficient with the spin mixing conductance g(↑↓) ≃ 1.2 × 10(14) cm(-2).
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                Author and article information

                Journal
                Advanced Electronic Materials
                Adv. Electron. Mater.
                Wiley
                2199160X
                July 2018
                July 2018
                May 17 2018
                : 4
                : 7
                : 1800106
                Affiliations
                [1 ]Department of Electrical and Electronic Information Engineering; Toyohashi University of Technology; 1-1 Hibari-Ga-Oka, Tempaku Toyohashi Aichi 441-8580 Japan
                [2 ]PRESTO; JST; 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
                [3 ]Department of Materials Science and Engineering; Massachusetts Institute of Technology; 77 Massachusetts Avenue Cambridge MA 02139 USA
                Article
                10.1002/aelm.201800106
                4f1286ac-d5e4-4cb1-8cb1-a0a3d2aebebe
                © 2018

                http://doi.wiley.com/10.1002/tdm_license_1.1

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