The effect of stress on the magnetic properties of low bandwidth manganites

The low bandwidth Pr0.9Ca0.1MnO3 (PCMO) thin films prepared by sol-gel method were suffered tensile and compressive stress grown on SrTiO3 and LaAlO3 substrates. The hysteresis loops at different temperatures show that the coercivity field with tensile stress is larger due to the much stronger pinning potential of ferromagnetism motion. The temperature dependence of the ZFC and FC magnetizations indicates that the stress significantly affects the ferromagnetic (FM) and antiferromagnetic (AFM) transition temperature of PCMO, and the Curie temperature (TC) decreases with tensile stress. The films show strong anisotropy properties that the magnetization increases much faster with the magnetic field when H⊥c, but the coercive field and saturation magnetization do not change significantly. In addition, the persistent photoinduced magnetization is investigated, and significant improvement of the ferromagnetic ordering was observed in low temperature.

Фотоиндуцированный магнитооптический эффект Керра в сульфиде европия EuS

The photoinduced magnetization in europium sulfide EuS was studied by the magneto-optical Kerr effect. It is experimentally established that when a sample is exposed to light with a photon energy greater than the band gap, photoinduced magnetization arises, associated with the formation of magnetic polarons with a large magnetic moment of about 3000 μB. The polarons are excited in a narrow temperature range of 12-18 K and form a superparamagnetic ensemble with an average polaron lifetime of 13 µs. An experimental setup for measuring photoinduced magnetization with the optical pump-and-probe method is described.