Omnidirectional magnetic imaging of magnetic anisotropy and phase transitions

Abstract

Micron scale imaging of magnetic fields based on quantum sensors is a significant tool for understanding the evolution of magnetism through phase transitions and as a result of interactions inside of heterostructures. However, most imaging platforms, such as the nitrogen-vacancy (N-V) center in diamond, are restricted to applying magnetic fields along the quantization axis of the quantum sensor. This greatly restricts the utility of these systems for exploring materials that emit strong fields or exhibit variable response with respect to the applied field direction. Here we explore an alternative approach using weakly coupled spin pairs in hBN that exhibit a spin-1/2-like behavior and an iso..