Magnetic tunnel junctions are nanoscale devices which have recently attracted interested in the context of frequency multiplexed spintronic neural networks, due to their interesting dynamical properties, which are defined during the fabrication process, and depend on the material parameters and geometry. This paper proposes an approach to extending the functionality of a standard magnetic tunnel junction (MTJ) by introducing an additional ferromagnet/antiferromagnet (FM/AFM) storage layer (SL) vertically integrated with the standard Vortex MTJ stack into the nanopillar. The magnetostatic field created by this storage layer acts on the free layer and can be used to change its static and dynamic properties. To tune the magnitude and direction of this magnetostatic field, magnetic reconfiguration is carried out through a thermally assisted switching mechanism using a voltage pulse that heats the AFM layer in the SL above the Neel temperature in the presence of an external field. It is experimentally shown that using an MTJ based on a 600 nm diameter nanopillar with a vortex in the free layer, reconfiguration of the SL allows to continuously change the core precession frequency in the 15 MHz range. The reconfigurable analogue storage layer locally affects both the static and dynamic properties of the MTJ free layer, demonstrating vertical 3D integration of additional functionalities into a single MTJ nanopillar.
Non-volatile programmable silicon photonics using an ultralow loss Sb$_2$Se$_3$ phase change material
可适应、可重构和可编程是下一代硅基光子处理器、神经网络和量子网络的关键功能。相变技术提供了经验证的非易失性电子可编程性，然而迄今为止使用的材料已经显示出与集成光子平台不兼容的过高的光学损耗。在这里，我们证明了以前未开发的材料Sb $_2$ Se $_3$的超低损耗可编程硅光子的能力。在Sb $_2$ Se $_3$中看到的大折射率对比度和超低损耗的有利组合促进了马赫-曾德尔干涉仪中超过10 $π$弧度的前所未有的光学相位控制。为了证明对光的流动的完全控制，我们引入纳米光子数字图案化作为一种概念上的新方法，其足迹数量级小于最先进的干涉仪网格。我们的方法使大量的可能性，在高密度的硅芯片上的光学功能的重新配置。
Non-Volatile Vortex MTJs with Opto-Electrical and Spin-Diode Nonlinearities as Multifunctional Neuromorphic Platforms
Universität Greifswald（格赖夫斯瓦尔德大学）；Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）；INL - International Iberian Nanotechnology Laboratory（国际伊比利亚纳米技术实验室）；Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften（巴伐利亚科学院瓦尔特-迈斯纳研究所）
Spatially-Controlled Planar Guided Crystallization of Low-Loss Phase Change Materials for Programmable Photonics
CNRS, Ecole Centrale de Lyon, INSA Lyon, Universite Claude Bernard Lyon 1, CPE Lyon（法国国家科学研究中心、里昂中央理工学院、里昂国立应用科学学院、里昂第一大学、里昂高等化工学院）；Université Côte d'Azur, CNRS, CRHEA（蔚蓝海岸大学、法国国家科学研究中心、高能物理与应用化学研究中心）；Universite Claude Bernard Lyon 1, CNRS, Institut Lumière Matière（里昂第一大学、法国国家科学研究中心、光物质研究所）；Colorado School of Mines（科罗拉多矿业大学）
Reconfigurable field-free spin Hall nano-oscillators enabled by crystallographic anisotropy in epitaxial Co/Pt
University of Gothenburg（哥德堡大学）；Indian Institute of Science Education and Research Bhopal（印度科学教育研究所博帕尔分校）；Northwestern University（西北大学）；Tohoku University（东北大学）
