  CHUF (cooling and heating in unequal field) protocol allows establishing
phase coexistence through macroscopic measurements and enables distinguishing
the metastable and stable phases (amongst the coexisting phase fractions across
a first order magnetic transition) of a glass-like arrested state (GLAS). The
observation of kinetic arrest in magnetic shape memory alloys has become a very
active area of research. We highlight recent CHUF measurements on these
materials that show behaviour similar to that reported earlier in manganites
and other intermetallic alloys, emphasizing the generality. The martensitic
transition provides an opportunity to study various properties as the CHUF
protocol enables tuning of phase fractions, and controlled devitrification, of
GLAS.
