Insight into intrinsic ferromagnetism in quasi-2D Cr 5- y Te 8 .

Cr ₅ Te ₈ is a half metal with 2D van der Waals ferromagnetic structure and its magnetic properties can be tuned by changing the proportionality of Cr and Te. We report an investigation of magnetization and magnetic anisotropy near the critical transition region of a Cr _{5- y} Te ₈ single crystal with the static and dynamic probes, to unravel the nature of field-dependent spin-spin interactions. The magnetic transition temperature T _C increasing from 255 K (at near zero-field) to 279 K (at 65 kOe along the ab -plane) has been identified. Accordingly, a phase diagram of field versus transition temperature has been established. From the analysis of the field dependence of the critical behavior, we provided evidence that the scenario of 2D Heisenberg-type interactions can be employed to interpret the field-dependent magnetic transitions in Te-rich Cr _4.8 Te ₈ . The precise picture for the field-reduced spin-spin interaction range has been obtained. The conclusion drawn from the present study demonstrated that Cr _4.8 Te ₈ is a promising candidate for the spintronic applications with a tunable magnetic transition temperature.
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