A highly sensitive magnetic sensor using a 2D van der Waals ferromagnetic material

TL;DR

This paper introduces a highly sensitive magnetic sensor based on a single-layer VSe2 2D ferromagnetic material, achieving exceptional sensitivity for magnetic field detection in compact spintronic devices.

Contribution

The paper demonstrates a novel magnetic sensor utilizing 2D VSe2 with record sensitivity, expanding the application potential of ultrathin ferromagnetic materials.

Findings

Sensor sensitivity reaches 16x10^6 Hz/Oe.

Uses resonance frequency shifts in an LC circuit.

Employs 2D VSe2 as a magnetic core.

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 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. The sensitivity of the sensor reaches an extremely high value of 16x10^6 Hz/Oe, making it an excellent candidate for a wide range of magnetic sensing applications.