论文标题
通过固定层几何形状控制涡流型磁性隧道接线磁力计传感器的灵敏度
Control of sensitivity in vortex-type magnetic tunnel junction magnetometer sensors by the pinned layer geometry
论文作者
论文摘要
在各种应用中，需要调整线性磁传感器中的灵敏度和动态范围。我们演示了具有涡流型传感层的磁性隧道连接（MTJ）传感器中灵敏度的控制和设计。在这项工作中，我们开发了传感器MTJ，其Nife感应层具有涡流磁性构型。我们证明，通过改变固定的层大小，对磁场的敏感性是线性调节的。我们获得了140％的高磁倍率比率，我们证明了可控的灵敏度为0.85至4.43％/oe，同时使涡流层固定为尺寸。我们将实验结果与微磁模拟进行比较。我们发现，通过应用字段对涡流核心的线性位移使涡流传感器的设计变得简单。固定层几何形状的控制是提高灵敏度的有效方法，而不会影响感应层的涡旋状态。此外，我们建议可以使用固定层的位置来实现单个传感器的更多传感功能。
The tuning of sensitivity and dynamic range in linear magnetic sensors is required in various applications. We demonstrate the control and design of the sensitivity in magnetic tunnel junction (MTJ) sensors with a vortex-type sensing layer. In this work, we develop sensor MTJs with NiFe sensing layers having a vortex magnetic configuration. We demonstrate that by varying the pinned layer size, the sensitivity to magnetic field is tuned linearly. We obtain a high magnetoresistance ratio of 140 %, and we demonstrate a controllable sensitivity from 0.85 to 4.43 %/Oe, while keeping the vortex layer fixed in size. We compare our experimental results with micromagnetic simulations. We find that the linear displacement of vortex core by an applied field makes the design of vortex sensors simple. The control of the pinned layer geometry is an effective method to increase the sensitivity, without affecting the vortex state of the sensing layer. Furthermore, we propose that the location of the pinned layer can be used to realize more sensing functionalities from a single sensor.
