Photoinduced formation of ferromagnetic clusters in La₀₉Ca₀₁MnO₃ thin films

Abstract

Microwave losses due to conductivity and magnetic permeability are investigated in La₀₉Ca₀₁MnO₃ films illuminated with photons in the energy range of E=0.5 - 2 eV. Growth of photoinduced ferromagnetic hysteresis is observed when the magnetic field is swept between 215 and 15 mT at temperatures below 60 K. The time required for saturation of the opening of the hysteresis loop depends on the photon energy having the minimum of ≈ 40 s at the illumination intensity I=3.5×10¹⁴