Abstract
We studied systematically the magnetic properties ofLa0.67Sr0.33MnO3 − δ/Pr0.7Ca0.3MnO3 − δ/La0.67Sr0.33MnO3 − δ trilayer epitaxial filmfabricated on (001) LaAlO3 single-crystal substrate using a direct current magnetron sputtering technique. Aspin-glass-like behaviour and a magnetization relaxation phenomenon areobserved from the results of the dependences of susceptibility on temperature(χ versusT curve) and magneticrelaxation on time (M versus t curve). The magnetic relaxation results are well fitted using thedouble-well-potential model. We also discussed the possible mechanism forthe existence of spin-glass-like behaviour in the film. According to theχ versusT curves and the hysteresis loop, a magnetic anisotropy was observedin the film. The difference in electron-magnetic properties betweenLa0.67Sr0.33MnO3 − δ single-layerepitaxial film and La0.67Sr0.33MnO3 − δ/Pr0.7Ca0.3MnO3 − δ/La0.67Sr0.33MnO3 − δ trilayer epitaxial film is also discussed.
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