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For the skyrmion-hosting intermetallic Gd$_2$PdSi$_3$ with centrosymmetrichexagonal lattice and triangular net of rare earth sites, we report a thoroughinvestigation of the magnetic phase diagram. Our work reveals a new magneticphase with isotropic value of the critical field for all orientations, wherethe magnetic ordering vector $\mathbf{q}$ is depinned from its preferreddirections in the basal plane. This is in contrast to the highly anisotropicbehavior of the low field phases, such as the skyrmion lattice (SkL), which areeasily destroyed by in-plane magnetic field. The bulk nature of the SkL and ofother magnetic phases was evidenced by specific-heat measurements. Resistivityanisotropy, likely originating from partial gapping of the density of statesalong $\mathbf{q}$ in this RKKY magnet, is picked up via the planar Hall effect(PHE). The PHE confirms the single-$\mathbf{q}$ nature of the magnetic orderwhen the field is in the hexagonal plane, and allows to detect the preferreddirections of $\mathbf{q}$. For field aligned perpendicular to the basal plane,several scenarios for the depinned phase (DP), such as tilted conical order,are discussed on the basis of the data.

High-field depinned phase and planar Hall effect in skyrmion-host Gd$_2$PdSi$_3$