The title compound was recently shown to exhibit a spin-flop transition (SF
) from an antiferromagnetic (AF) to a canted AF (CAF) phase. Here, we repor
t on the evolution of the magnetic anisotropy in the AF and CAF phases as m
easured by cantilever magnetometry. New curvature: was found in the AF-CAF
phase boundary below 2K, providing evidence that the T=0 ground state may b
e CAF rather than AF, and that the CAF state is reentrant at low temperatur
e.