$\mu$SR measurements of 3D Ising ferromagnetism in bulk Fe$_3$GeTe$_2$ crystals
Fe$_3$GeTe$_2$ is a quasi-two-dimensional itinerant ferromagnet with a van-der-Waals layered structure that exhibits substantial magnetic anisotropy. In bulk samples, this material becomes magnetically ordered below 220~K, while in thin samples, the gate-tunability of the ferromagnetic moment has attracted significant...