Effect of Ga-substitution on the magnetic and magnetotransport properties of kagome net magnet TbMn₆Sn₆

RMn₆Sn₆ compounds, where R is a rare-earth element, have recently attracted significant attention due to their diverse magnetic and magnetotransport properties, primarily driven by the interplay between interplanar exchange interactions, magnetic anisotropy, and thermal spin fluctuations. Among them, TbMn₆Sn₆ stands out for exhibiting spin reorientation behavior. In this compound, the ferrimagnetically coupled Tb and Mn moments, which order simultaneously at around 420 K, rotate from an in-plane alignment to an out-of-plane alignment at 310 K. This state has allowed for intriguing studies, such as investigating the timescale of spin reorientation using ultrafast techniques and stabilizing magnetic bi-skyrmions near the spin reorientation temperature. Additionally, scaling studies of the anomalous Hall effect in this compound have suggested that spin fluctuations also contribute to this phenomenon.

We found that partially substituting Sn with Ga significantly lowers the spin reorientation temperature. Moreover, anisotropic magnetic properties emerge when a magnetic field is applied in different directions, including a pronounced hysteresis in the magnetization at low temperatures for an in-plane magnetic field. In this talk, we will discuss the microscopic origins of these observations and their potential significance to the broader family of RMn₆Sn₆ compounds.