2020/09/06 by R. Kohno, Ryuhei Kohno, N. Thiery +17 · 8 citations
Engineering · Physics and Astronomy · #Annealing (glass) #Conductance #Electrical resistivity and conductivity #Joule heating #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Quantum and electron transport phenomena #Spin (aerodynamics) #Spin Hall effect #Spin current #Spin polarization #Yttrium iron garnet #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/5.0028664
published in Applied Physics Letters 118(3) (American Institute of Physics)
arxiv created 2020/09/06 · openalex created_date 2020/09/11 · openalex publication_date 2021/01/18 · arxiv updated 2021/02/24 · openalex updated_date 2026/08/06
We report that Joule heating can be used to enhance the interfacial spin conductivity between a metal and an oxide. We observe that local annealing of the interface at about 550 K, when injecting large current densities (>1012A/m2) into a pristine 7 nm thick Pt nanostrip evaporated on top of yttrium iron garnet (YIG), can improve the effective spin transmission up to a factor of 3. This result is of particular interest when interfacing ultrathin garnet films to avoid strong chemical etching of the surface. The effect is confirmed by the following methods: spin Hall magnetoresistance, spin pumping, and non-local spin transport. We use it to study the influence of the YIG|Pt coupling on the non-linear spin transport properties. We find that the crossover current from a linear to a non-linear spin transport regime is independent of this coupling.