Fabrication of Hall Micromagnetometers for Probing Two-Dimensional Magnets

Two-dimensional (2D) magnetic materials¹ have emerged as a promising area for both new physics and potential spintronics applications. Recent work has shown the ballistic Hall micromagnetometry using graphene Hall bars can be used to detect the magnetization of atomically thin 2D magnetic materials.² We will discuss our approach to the fabrication of such devices on top of 2D magnetic layers. The magnetic layers are first exfoliated onto a clean Si/SiO₂ chip. A Hall bar is fabricated using a standard dry transfer technique, layer stacking, and electron beam lithography. The Hall bar is placed so that it half covers the magnetic layer. As in reference 1, the region covering the magnetic material is actively compared to the region not covering the magnetic material, which acts as a control. We perform low temperature magnetoconductance measurements, and the latest results will be discussed.

1. B. Huang, et al. Layer dependent ferromagnetism in a van der Waals crystal down to the monolayer limit. Nature 546, 270-273 (08 June 2017)
2. M. Kim, et al. Hall micromagnetometry of individual two-dimensional ferromagnets. arXiv:1902.06988 (2019)