A magnetic sensor using a 2D van der Waals ferromagnetic material
A magnetic sensor using a 2D van der Waals ferromagnetic material
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DOI：
10.1038/s41598-020-61798-2
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发表时间：
2020-03-16
影响因子：
4.6
通讯作者：
Phan, Manh-Huong
中科院分区：
文献类型：
--
作者：
Jimenez, Valery Ortiz;Kalappattil, Vijaysankar;Phan, Manh-Huong
二维 (2D) 范德华铁磁材料正在成为超紧凑自旋电子纳米器件、纳米传感器和信息存储应用的有前景的候选材料。我们最近发现在石墨或 MoS2 基底上生长的单层 VSe2 具有强室温铁磁性，这为探索这些超薄磁体的此类应用提供了新的机会。在本文中，我们提出了一种新型磁传感器，它利用单层 VSe2 薄膜作为高灵敏度磁芯。该传感器依赖于由软铁磁微线线圈组成的 LC 电路谐振频率的变化，该线圈包含受到施加的直流磁场影响的铁磁 VSe2 薄膜。我们将灵敏度定义为传感器特性曲线的斜率 df(0)/dH，其中 f(0) 是谐振频率，H 是外部磁场。该传感器的灵敏度高达 16x10(6)Hz/Oe，使其成为广泛磁传感应用的潜在候选者。
Two-dimensional (2D) van der Waals ferromagnetic materials are emerging as promising candidates for applications in ultra-compact spintronic nanodevices, nanosensors, and information storage. Our recent discovery of the strong room temperature ferromagnetism in single layers of VSe2 grown on graphite or MoS2 substrate has opened new opportunities to explore these ultrathin magnets for such applications. In this paper, we present a new type of magnetic sensor that utilizes the single layer VSe2 film as a highly sensitive magnetic core. The sensor relies in changes in resonance frequency of the LC circuit composed of a soft ferromagnetic microwire coil that contains the ferromagnetic VSe2 film subject to applied DC magnetic fields. We define sensitivity as the slope of the characteristic curve of our sensor, df(0)/dH, where f(0) is the resonance frequency and H is the external magnetic field. The sensitivity of the sensor reaches a large value of 16x10(6)Hz/Oe, making it a potential candidate for a wide range of magnetic sensing applications.