arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.09018cond-mat.mes-hall
收藏

超导自旋电子学材料TaN的生长优化

Growth optimization of TaN for superconducting spintronics

Manuel Müller, Raphael Hoepfl, Lukas Liensberger, Stephan Geprägs, Hans Huebl, Mathias Weiler, Rudolf Gross, Matthias Althammer

摘要:

我们优化了用直流磁控溅射法在\ch{SiO2}衬底上生长TaN超导薄膜的工艺,得到了最大超导转变温度$T_{\mathrm{c}}=5$ K和最大临界场$μ_0H_{\mathrm{c2}}=(13.8\pm0.1)$ T。为了研究超导体/铁磁体异质结构中自旋-轨道相互作用的影响,我们使用宽带铁磁共振(bbFMR)谱分析了正常态和超导TaN/ \ch{Ni80Fe20}(坡莫合金,Py)双层膜的磁化动力学随温度的变化。利用微波传输信号的相敏检测,定量地提取了双层膜的电流感应力矩。结果进行了比较,我们以前的研究NbN/Py-bilayers。在TaN的正常状态下,我们检测到一个正的阻尼类电流感应扭矩$σ_{\mathrm{d}}$的逆自旋霍尔效应(iSHE)和一个小的类场扭矩$σ_{\mathrm{f}}$归因于逆Rashba-Edelstein效应(iREE)在TaN/Py界面。在TaN的超导状态下,我们检测到一个负的$σ_{\mathrm{d}}$归因于准粒子介导的逆自旋霍尔效应(QMiSHE)和一个大的正场一样的$σ_{\mathrm{f}}$的未知来源的意外表现匹配我们以前的结果为NbN/Py-bilayer。

英文摘要:

We have optimized the growth of superconducting TaN thin films on \ch{SiO2} substrates via dc magnetron sputtering and extract a maximum superconducting transition temperature of $T_{\mathrm{c}}=5$ K as well as a maximum critical field $μ_0H_{\mathrm{c2}}=(13.8\pm0.1)$ T. To investigate the impact of spin-orbit interaction in superconductor/ferromagnet heterostructures, we then analyze the magnetization dynamics of both normal state and superconducting TaN/\ch{Ni80Fe20}(Permalloy, Py)-bilayers as a function of temperature using broadband ferromagnetic resonance (bbFMR) spectroscopy. The phase sensitive detection of the microwave transmission signal is used to quantitatively extract the inverse current-induced torques of the bilayers. The results are compared to our previous study on NbN/Py-bilayers. In the normal state of TaN, we detect a positive damping-like current-induced torque $σ_{\mathrm{d}}$ from the inverse spin Hall effect (iSHE) and a small field-like torque $σ_{\mathrm{f}}$ attributed to the inverse Rashba-Edelstein effect (iREE) at the TaN/Py-interface. In the superconducting state of TaN, we detect a negative $σ_{\mathrm{d}}$ attributed to the quasiparticle mediated inverse spin Hall effect (QMiSHE) and the unexpected manifestation of a large positive field-like $σ_{\mathrm{f}}$ of unknown origin matching our previous results for NbN/Py-bilayers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑