Critical scaling behavior in skyrmion host ferromagnet Cr1.45Te2

Abstract

Materials hosting diverse topological spin textures hold significant potential for spintronic applications. In this context, Cr_1.45Te₂, a quasi-two-dimensional material, stands out due to its stable Néel-type skyrmion phase over a wide temperature range, both with and without an applied magnetic field [APL 125, 152402 (2024)]. Thus, it is a promising candidate for investigating complex magnetic phenomena, offering valuable insights into the underlying magnetic interactions. This study investigates the critical behavior of Cr_1.45Te₂ near $T_{\text{C}}$ by measuring DC magnetic isotherms. A systematic analysis of these isotherms with the magnetic field applied along the easy axis allows us to determine the asymptotic critical exponents: $\beta =0.314\pm 0.019$, $\gamma =1.069\pm 0.055$, and $\delta =4.386\pm 0.001$, where the Widom scaling law and scaling equations verified the self-consistency and reliability. In this system, the magnetic exchange coupling $J$ ($r$) is the long-range type and decays spatially at a rate slower than approximately $\approx r^{-4.651}$. Most notably, a series of vertical lines in the low-field region of the initial magnetization curves below $T_{\text{C}}$ supports the existence of a skyrmion phase in this compound.