  We present magnetization and Hall effect measurements on the pyrochlore
iridate Nd2Ir2O7. Previous muon spin rotation measurements have shown that the
system undergoes an unusual transition at T$_M$ = 110 K into a magnetic phase
lacking long-range order, followed by a transition at T$_LRO$ = 6 K into a
state with long-range magnetic order. We observe a small remnant magnetization
when cycling through zero magnetic field at temperatures below T$_M$. Below
T$_LRO$, this remnant magnetization increases sharply, and new hysteresis
effects appear at a higher field B$_c$ = 2.5 T, while the Hall resistance
develops a non-monotonic and hysteretic magnetic field dependence, with a
maximum at B$_c$ and signatures of an anomalous Hall effect. The dependence on
field sweep direction demonstrates a non-trivial transition into a magnetically
ordered state with properties paralleling those of known spin-ice systems and
suggests a spin reorientation transition across the metal insulator transition
in the A-227 series.
