  Reliable and profound studies of actual magnetic domain structure in
rare-earth A2Ir2O7 pyrochlore iridates are frequently limited by insufficient
sample quality or lack of single crystals. We report the magnetic properties of
the for-the-first-time synthesised Lu2Ir2O7 and Er2Ir2O7 single-crystals. The
paper is focused on the robust ferromagnetic component of magnetisation present
in the material with the antiferromagnetically ordered state of the
all-in-all-out (AIAO) type, and is discussed in the framework of AIAO and AOAI
domains and interfaces on the geometrically frustrated lattice.
