局部焦耳退火增强YIG $|$ Pt自旋电导
Enhancement of YIG$|$Pt spin conductance by local Joule annealing
摘要：
我们报告，焦耳加热可以用来提高金属和氧化物之间的界面自旋电导率。我们观察到，通过将大电流密度（$>10^{12}\text{A/m}^{2}$）注入到蒸发在钇铁石榴石（YIG）顶部的原始7，nm厚的Pt纳米带中，在约550 K下对界面进行局部退火，可以将自旋传输提高到3倍：对于界面超薄石榴石膜，必须避免强烈的表面化学蚀刻，这是特别感兴趣的结果。通过自旋霍尔磁电阻、自旋泵浦和非局域自旋输运等方法证实了这种效应。我们用它来研究YIG $|$ Pt耦合对非线性自旋输运性质的影响。我们发现，从线性到非线性自旋输运制度的交叉电流是独立的这种耦合，这表明纯自旋电流在电介质中循环的行为主要是由裸YIG膜旁边的Pt纳米带的物理性质。
英文摘要：
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 by injecting large current densities ($>10^{12}\text{A/m}^{2}$) into a pristine 7\,nm thick Pt nanostrip evaporated on top of yttrium iron garnet (YIG), can improve the spin transmission up to a factor 3: a result of particular interest for interfacing ultra thin garnet films where strong chemical etching of the surface has to be avoided. The effect is confirmed by different 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 cross-over current from a linear to a non-linear spin transport regime is independent of this coupling, suggesting that the behavior of pure spin currents circulating in the dielectric are mostly governed by the physical properties of the bare YIG film beside the Pt nanostrip.
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