Observation of the magnetic structure in manganites by the high-resolution Bitter technique

The magnetic structure of the doped perovskite manganites La0.7Sr0.3MnO3 and La0.8Ca0.2MnO3 at a temperature of 10 K has been investigated by using the decoration technique in a wide region of external magnetic fields (up to 1000 Oe). We observe the multidomain ferromagnetic state in La0.7Sr0.3MnO3 and the coexistence of the ferro- and nonmagnetic phases in La0.8Ca0.2MnO3. The dependence of the structure on an external magnetic field has been investigated in La0.8Ca0.2MnO3.