Study on magnetic properties for La0.67Sr0.33MnO3 − δ/Pr0.7Ca0.3MnO3 − δ/La0.67Sr0.33MnO3 − δ trilayer epitaxial film

We studied systematically the magnetic properties of La0.67Sr0.33MnO3 − δ/Pr0.7Ca0.3MnO3 − δ/La0.67Sr0.33MnO3 − δ trilayer epitaxial film fabricated on (001) LaAlO3 single-crystal substrate using a direct current magnetron sputtering technique. A spin-glass-like behaviour and a magnetization relaxation phenomenon are observed from the results of the dependences of susceptibility on temperature (χ versus T curve) and magnetic relaxation on time (M versus t curve). The magnetic relaxation results are well fitted using the double-well-potential model. We also discussed the possible mechanism for the existence of spin-glass-like behaviour in the film. According to the χ versus T curves and the hysteresis loop, a magnetic anisotropy was observed in the film. The difference in electron-magnetic properties between La0.67Sr0.33MnO3 − δ single-layer epitaxial film and La0.67Sr0.33MnO3 − δ/Pr0.7Ca0.3MnO3 − δ/La0.67Sr0.33MnO3 − δ trilayer epitaxial film is also discussed.