From two-to multi-state vertical spin valves without spacer layer based on Fe3GeTe2 van der Waals homo-junctions

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（13）
• 页码范围: 1072-1077
• 页数: 6页
• 语种: 英文

摘要

Different than covalently bonded magnetic multilayer systems,high-quality interfaces without dangling bonds in van der Waals (vdW)junctions of two-dimensional (2D) layered magnetic materials offer opportunities to realize novel functionalities.Here,we report the fabrication of multi-state vertical spin valves without spacer layers by using vdW homo-junctions in which exfoliated Fe3GeTe2 nanoflakes act as ferromagnetic electrodes and/or interlayers.We demonstrate the typical behavior of two-state and three-state magnetoresistance for devices with two and three Fe3GeTe2 nanoflakes,respectively.Distinct from traditional spin valves with sandwich structures,our novel homo-junction-based spin-valve structure allows the straightforward realization of multi-state magnetic devices.Our work demonstrates the possibility of extend multi-state,non-volatile spin information to 2D magnetic homo-junctions,and it emphasizes the utility of vdW interface as a fundamental building block for spintronic devices.