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We report the magnetic phase diagram of Mn$_{1-x}$Fe$_{x}$PSe$_3$ whichrepresents a random magnet system of two antiferromagnetic systems with mixedspin, mixed spin anisotropies, mixed nearest neighbor magnetic interactions andmixed periodicities in their respective antiferromagnetic structure. Bulksamples of Mn$_{1-x}$Fe$_{x}$PSe$_3$ have been prepared and characterized phasepure by powder X-ray and neutron diffraction and X-ray fluorescence. Nature andextent of magnetically ordered state has been established using powder neutrondiffraction, dc magnetic susceptibility and heat capacity. Long-range magneticordering exists between $x = 0.0$ and 0.25 (MnPSe$_3$-type) and between $x =0.875$ and $1$ (FePSe$_3$-type). A short-range magnetic order with existence ofboth MnPSe$_3$- and FePSe$_3$-type nano-clusters has been established between$x = 0.25$ and $0.875$. Irreversibility in dc magnetization measurements, alsocharacterized by isothermal and thermoremanent magnetization measurementssuggest similarities to magnetic nanoparticles where uncompensated surfacespins result in a non-zero TRM and IRM response, further reinforcing existenceof magnetic nano-clusters or domains. A spin glass state, observed in analogousMn$_{1-x}$Fe$_x$PS$_3$, has been ruled out and formation of nano-clustersexhibiting both ordering types results from unusually high anisotropy values.The effect of ligand contributions to the spin-orbit interactions has beensuggested as a possible explanation for high $D$ values in these compounds.

Strong anisotropy in the mixed antiferromagnetic system Mn$_{1-x}$Fe$_{x}$PSe$_3$