Magnetic skyrmions are promising information carriers for dense and energy-efficient information storage owing to their small size, low driving-current density, and topological stability. Electrical detection of skyrmions is a crucial requirement to drive skyrmion devices toward applications. The use of a magnetic tunnel junction (MTJ) is commonly suggested for this purpose as MTJs are key spintronic devices for large-scale commercialization that can convert magnetic textures into electrical signals. To date, however, it has been challenging to realize skyrmions in MTJs due to incompatibility between standard skyrmion materials and highly efficient MTJ electrodes. Here, a material stack combining magnetic multilayers, which host 100 nm scale skyrmions, with a perpendicularly magnetized MTJ, is reported. The devices are designed so that the skyrmions in the multilayer are imprinted into the MTJ's free layer via magnetostatic interactions. The electrical response of a single skyrmion is successfully identified by employing simultaneous imaging of the magnetic texture and the electrical measurement of the MTJ resistance. The results are an important step toward all-electrical detection of skyrmions.

中文翻译：

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磁性隧道结中磁性 Skyrmions 的电检测

磁性斯格明子由于尺寸小、驱动电流密度低和拓扑稳定性好，是用于密集和节能信息存储的有前途的信息载体。skyrmion 的电检测是推动 skyrmion 设备走向应用的关键要求。为此通常建议使用磁隧道结 (MTJ)，因为 MTJ 是大规模商业化的关键自旋电子器件，可以将磁纹理转换为电信号。然而，迄今为止，由于标准斯格明子材料与高效 MTJ 电极之间的不相容性，在 MTJ 中实现斯格明子一直具有挑战性。在这里，报道了一种材料堆栈，该材料堆栈将承载 100 nm 尺度斯格明子的磁性多层与垂直磁化的 MTJ 相结合。这些设备的设计使得多层中的 skyrmions 通过静磁相互作用印在 MTJ 的自由层中。通过同时对磁结构成像和对 MTJ 电阻进行电测量，成功识别了单个斯格明子的电响应。结果是迈向全电检测斯格明子的重要一步。