Influence of interface layer insertion on the spin Seebeck effect and the spin Hall magnetoresistance of Y3Fe5O12/Pt bilayer systems

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Abstract

We observe significantly enhanced spin Seebeck effect (SSE) and spin Hall magnetoresistance (SMR) values
by inserting 0.3–0.6-nm-thick layers of magnetic materials with different composition (Cr, Ni80Fe20, Co90Fe10,
Fe50Co50, and Fe) at the Y3Fe5O12/Pt interface. To study the actual magnetic state of these insertion layers,
we, then, investigated the magnetization of these layers via generalized magneto-optical ellipsometry. Magnetic
insertion layers in this thickness range did not exhibit a measurable magnetization, even though our method
should have detected even a small fraction of the bulk magnetization value for the utilized materials easily.
Therefore, the observed SSE and SMR enhancement generated by the insertion of thin magnetic material layers
did not result from a net interface magnetization but might, instead, be related to the paramagnetic state of the
inserted layers.
Original languageEnglish
Pages (from-to)094411-1-11
Number of pages11
JournalPhysical Review B
Volume102
Issue number9
DOIs
Publication statusPublished - 2020

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