Characteristic temperatures in ferromagnetic - antiferromagnetic exchange
biased systems are analyzed. In addition to usual blocking temperature of
exchange bias TBβ, and the N\'{e}el temperature of an antiferromagnet
TNβ, the inducing temperature Tindβ, i.e., the temperature, at which
the direction of exchange anisotropy is established, has been recently
proposed. We demonstrate that this temperature is in general case different
from TBβ and TNβ. Physics and experimental approaches to measure the
inducing temperature are discussed. Measurements of Tindβ, in addition to
TBβ, and TNβ, provide important information about exchange interactions
in ferromagnetic - antiferromagnetic heterostructures