A flexible giant magnetoresistive device for sensing strain direction
A flexible giant magnetoresistive device for sensing strain direction
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DOI：
10.1038/s41928-018-0022-3
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发表时间：
2018-02-01
影响因子：
34.3
通讯作者：
Chiba, Daichi
中科院分区：
文献类型：
--
作者：
Ota, Shinya;Ando, Akira;Chiba, Daichi
小型化应变传感器在许多领域都很有价值，包括可穿戴设备和结构健康监测。基于磁阻效应的应变片以前已经开发出来，并且比传统设备具有潜在的优势。然而，到目前为止，这些方法只关注于感知应变的大小。在这里，我们展示了一个柔性的巨磁阻装置可以用来检测材料中的应变方向。我们的三层器件是在柔性衬底上制造的，由应变敏感的铁磁钴层和应变不敏感的铁磁坡莫合金（NiFe）层组成，由非磁性铜层分开。我们还表明，通过改造钴层的磁弹性特性，可以由单一铁磁材料制成应变敏感层和应变不敏感层。我们的自旋电子学和柔性电子学的集成可以导致能够映射局部应变方向的柔性传感器片的发展。
Miniaturized strain sensors are of value in a variety of areas, including wearable devices and structural health monitoring. Strain gauges based on magnetoresistance effects have previously been developed and offer potential advantages over conventional devices. However, these approaches have so far focused on sensing only the magnitude of the strain. Here, we show that a flexible giant magnetoresistive device can be used to detect the direction of strain in a material. Our trilayer devices, which are fabricated on a flexible substrate, consist of a strain-sensitive ferromagnetic cobalt layer and a strain-insensitive ferromagnetic permalloy (NiFe) layer, separated by a non-magnetic copper layer. We also show that the strain-sensitive and strain-insensitive layers can be made from a single ferromagnetic material by engineering the magnetoelastic properties of cobalt layers. Our integration of spintronics and flexible electronics could lead to the development of a flexible sensor sheet capable of mapping local strain directions.