论文标题
PT和COB Trilayer Josephson $π$连接带有垂直磁各向异性
Pt and CoB trilayer Josephson $π$ junctions with perpendicular magnetic anisotropy
论文作者
论文摘要
我们报告了基于NB的Josephson连接的电气传输属性，该连接与PT/CO $ _ {68} $ B $ _ {32} $/PT Ferromagnetic屏障。屏障表现出垂直的磁各向异性，这对于潜在应用的主要优势比磁化内部系统不影响接口的Fraunhofer响应。此外，我们报告说，pt/co $ _ {68} $ b $ _ {32} $接口没有磁性死层，使我们可以使用Ultra-Thin Co $ _ {68} $ b $ _ {32} $学习障碍。在交界处，我们观察到，临界电流的幅度随着CO $ _ {68} $ b $ _ {32} $ stront Ferromagnetic合金层的增加而振荡。振荡归因于从零变为$π$修改的连接处的基态相差。厚度范围内的多个振荡$ 0.2〜 \ leqslant〜d_ \ text {cob}〜\ leqslant〜1.4 $ 〜nm表明我们可以访问第一个零$ $π$和$π$ $ -ZERO的相位过渡。我们的结果推动了基于铁磁约瑟夫森连接的低温记忆设备的发展。
We report on the electrical transport properties of Nb based Josephson junctions with Pt/Co$_{68}$B$_{32}$/Pt ferromagnetic barriers. The barriers exhibit perpendicular magnetic anisotropy, which has the main advantage for potential applications over magnetisation in-plane systems of not affecting the Fraunhofer response of the junction. In addition, we report that there is no magnetic dead layer at the Pt/Co$_{68}$B$_{32}$ interfaces, allowing us to study barriers with ultra-thin Co$_{68}$B$_{32}$. In the junctions, we observe that the magnitude of the critical current oscillates with increasing thickness of the Co$_{68}$B$_{32}$ strong ferromagnetic alloy layer. The oscillations are attributed to the ground state phase difference across the junctions being modified from zero to $π$. The multiple oscillations in the thickness range $0.2~\leqslant~d_\text{CoB}~\leqslant~1.4$~nm suggests that we have access to the first zero-$π$ and $π$-zero phase transitions. Our results fuel the development of low-temperature memory devices based on ferromagnetic Josephson junctions.
