  The equilibrium conformations of a flexible permanent magnetic chain that
consists of a sequence of linked magnetic colloidal nanoparticles with
short-ranged Lennard-Jones attractive interactions (Stockmayer polymer) are
thoroughly analysed via Langevin dynamics simulations. A tentative phase
diagram is presented for a chain of length $N=100$. The phase diagram exhibits
several unusual conformational phases when compared with the non-magnetic
chains. These phases are characterised by a large degree of conformational
anisotropy, and consist of closed chains, helicoidal-like states, partially
collapsed states, and very compact disordered states. The phase diagram
contains several interesting features like the existence of at least two
'triple points'.
