Magnetic coupling and magnetoresistance in La0.55Sr0.45MnO3/ La0.67Ca0.33 MnO3 multilayers

M.SIRENA; N. HABERKORN; L.B. STEREN; J. GUIMPEL

JOURNAL OF APPLIED PHYSICS

AMER INST PHYSICS

Año: 2003 vol. 93 p. 6177 - 6179

0021-8979

We have studied the interlayer coupling and the magnetoresistant effect of La0.55Sr0.45MnO3/ La0.67Ca0.33MnO3 structures. Magnetization loops, measured in La0.55Sr0.45MnO3/La0.67Ca0.33MnO3/La0.55Sr0.45MnO3 trilayers, indicate that there is a ferromagnetic coupling of the La0.55Sr0.45MnO3 layers across the La0.67Ca0.33MnO3 spacer up to room temperature, even above the Curie temperature of the La0.67Ca0.33MnO3 layers. However, magnetization versus temperature curves present signatures of the magnetic ordering of both compounds. No extrinsic magnetoresistance associated with the multilayered structure was observed in the whole temperature range due to the presence of the interlayer ferromagnetic coupling.