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We present a combined study of zero-field $^{51}$V and $^{127}$I NMR atambient pressure and specific heat and magnetization measurements underpressure up to 2.08 GPa on bulk single crystals of the van-der-Waalsferromagnet VI$_3$. At ambient pressure, our results consistently demonstratethat VI$_3$ undergoes a structural transition at $T_s \approx $78 K, followedby two subsequent ferromagnetic transitions at $T_{FM1} \approx $50 K and$T_{FM2} \approx $36 K upon cooling. At lowest temperature ($T < T_{FM2}$), twomagnetically-ordered V sites exist, whereas only one magnetically-ordered Vsite is observed for $T_{FM1} < T\,< T_{FM2}$. Whereas $T_{FM1}$ is almostunaffected by external pressure, $T_{FM2}$ is highly responsive to pressure andmerges with the $T_{FM1}$ line at $p \approx 0.6 $GPa. At even higher pressures($p \approx $1.25\,GPa), the $T_{FM2}$ line merges with the structuraltransition at $T_s$ which becomes moderately suppressed with $p$ for $p < 1.25$GPa. Taken together, our data point towards a complex magnetic structure and aninteresting interplay of magnetic and structural degrees of freedom in VI$_3$.

Multiple ferromagnetic transitions and structural distortion in the van-der-Waals ferromagnet VI$_3$ at ambient and finite pressures