Photodoping-induced magnetization changes in perovskite-type Nd 0.52Sr0.48MnO3 (NSMO) film and a NSMO/SrTiO3 (STO) heterostructure were investigated by probing time-resolved magneto-optical Kerr effects. The NSMO film exhibited a photoinduced magnetization increase in several tens of picoseconds due to the thermal effect after rapid (<200 fs) photocarrier recombination. The heterostructure, by contrast, produced a magnetization increase in 200 fs due to both rapid injection of photogenerated holes from the STO layer to the NSMO layer and the delay in recombination of electrons and holes separated in the two layers. The heterostructure is a useful system for exploring photodoping-induced phenomena in correlated electron oxides since it enables discrimination between photodoping- and heat-induced effects.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Jul 12|