  This paper reports on the temperature evolution of local elastic interactions
between ferromagnetic CoFe films and ferroelectric BaTiO3 substrates.
Polarization microscopy measurements indicate that growth-induced stripe
domains in the CoFe films are preserved and strengthened during cooling and
heating through the structural phase transitions of BaTiO3. Moreover, rotation
of the magnetic easy axes at the tertragonal-to-orthorhombic transition (T =
278 K) and at T = 380 K simultaneously switches the local magnetization of both
uniaxial domains by 90 degrees. Irreversible changes in the ferromagnetic
domain pattern are induced when the room-temperature ferroelectric domain
structure is altered after temperature cycling.
