Flexible magnetic sensors, which have advantages such as deformability, vector field sensing, and noncontact detection, are an important branch of flexible electronics and have significant applications in fields such as magnetosensitive electronic skin. Human skin surfaces have complicated deformations, which pose a demand for magnetic sensors that can withstand omnidirectional strain while maintaining stable performance. However, existing flexible magnetic sensor arrays can only withstand stretching along specific directions and are prone to failure under complicated deformations. Here, we demonstrate an omnidirectionally stretchable spin-valve sensor array with high stretchability and excellent performance. By integrating the modulus-distributed structure with liquid metal, the sensor can maintain its performance under complex deformations, enabling the overall system with omnidirectional stretchability. The fabricated spin-valve sensor exhibits a nearly unchanged giant magnetoresistance ratio of 8% and a maximum sensitivity of 0.93%/Oe upon omnidirectional strain up to 86% and can maintain stable performance without fatigue for over 1000 stretching cycles. Furthermore, this spin-valve sensor array is characterized by stable sensing performance for magnetic fields under complicated deformations and can be applied as a magnetosensitive electronic skin. Our results provide insights into the development of next-generation stretchable and wearable magnetoelectronics.

中文翻译：

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具有稳定巨磁阻性能的全向可拉伸自旋阀传感器阵列


柔性磁传感器具有变形能力、矢量场传感和非接触式检测等优点，是柔性电子学的一个重要分支，在磁敏电子皮肤等领域具有重要应用。人体皮肤表面具有复杂的变形，因此需要能够承受全方位应变同时保持稳定性能的磁性传感器。然而，现有的柔性磁传感器阵列只能承受沿特定方向的拉伸，并且在复杂的变形下容易失效。在这里，我们展示了一种具有高拉伸性和出色性能的全向可拉伸自旋阀传感器阵列。通过将模量分布结构与液态金属集成，传感器可以在复杂变形下保持其性能，使整个系统具有全向可拉伸性。制造的自旋阀传感器在高达 8% 的全向应变下表现出几乎不变的 8% 巨磁阻比和 0.93%/Oe 的最大灵敏度，并且可以在 1000 多次拉伸循环中保持稳定的性能而不会疲劳。此外，该自旋阀传感器阵列的特点是复杂变形下对磁场的稳定传感性能，可以作为磁敏电子皮肤应用。我们的结果为下一代可拉伸和可穿戴磁电子学的开发提供了见解。