nl1c04358_si_001.pdf (6.07 MB)
Atomic Scale Control of Spin Current Transmission at Interfaces
journal contributionposted on 2022-04-20, 18:11 authored by Mohamed Amine Wahada, Ersoy Şaşıoğlu, Wolfgang Hoppe, Xilin Zhou, Hakan Deniz, Reza Rouzegar, Tobias Kampfrath, Ingrid Mertig, Stuart S. P. Parkin, Georg Woltersdorf
Ferromagnet/heavy metal bilayers represent a central building block for spintronic devices where the magnetization of the ferromagnet can be controlled by spin currents generated in the heavy metal. The efficiency of spin current generation is paramount. Equally important is the efficient transfer of this spin current across the ferromagnet/heavy metal interface. Here, we show theoretically and experimentally that for Ta as heavy metal the interface only partially transmits the spin current while this effect is absent when Pt is used as heavy metal. This is due to magnetic moment reduction at the interface caused by 3d–5d hybridization effects. We show that this effect can be avoided by atomically thin interlayers. On the basis of our theoretical model we conclude that this is a general effect and occurs for all 5d metals with less than half-filled 5d shell.
magnetic moment reductioncentral building blockatomically thin interlayersatomic scale controlspin currents generatedspin current transmissionspin current generationspin current acrossfilled 5d shellheavy metal interfacespin currentheavy metal5d metalstheoretical modelspintronic devicespartially transmitsinterface causedequally importantefficient transfer