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It has been suggested that strongly magnetised and rapidly rotatingprotoneutron stars (PNSs) may produce long duration gamma-ray bursts (GRBs)originating from stellar core collapse. We explore the steady-state propertiesand heavy element nucleosynthesis in neutrino-driven winds from such PNSs whosemagnetic axis is generally misaligned with the axis of rotation. We consider awide variety of central engine properties such as surface dipole fieldstrength, initial rotation period and magnetic obliquity to show that heavyelement nuclei can be synthesised in the radially expanding wind. This processis facilitated provided the outflow is Poynting-flux dominated such that itslow entropy and fast expansion timescale enables heavy nuclei to form in a moreefficient manner as compared to the equivalent thermal GRB outflows. We alsoexamine the acceleration and survival of these heavy nuclei and show that theycan reach sufficiently high energies $\gtrsim 10^{20}\ {\rm eV}$ within thesame physical regions that are also responsible for powering gamma-rayemission, primarily through magnetic dissipation processes. Although thesemagnetised outflows generally fail to achieve the production of elementsheavier than lanthanides for our explored electron fraction range 0.4-0.6, weshow that they are more than capable of synthesizing nuclei near and beyondiron peak elements.

On the synthesis of heavy nuclei in protomagnetar outflows and implications for ultra-high energy cosmic rays