A magnetic sensor using a 2D van der Waals ferromagnetic material
Valery Ortiz Jimenez, Vijaysankar Kalappattil, Tatiana Eggers, Manuel Bonilla, Sadhu Kolekar, Phạm Thành Huy, Matthias Batzill, Manh‐Huong Phan
Abstract
Abstract 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 VSe 2 grown on graphite or MoS 2 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 VSe 2 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 VSe 2 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 16 × 10 6 Hz/Oe, making it a potential candidate for a wide range of magnetic sensing applications.