We have studied the structure, magnetic, and transport properties of manganite-based multilayers with (metallic ferromagnet), and spacers of different nature: (nonmagnetic insulator), (insulator ferromagnet), and (paramagnetic-insulator/ferromagnet-metal). The samples are strongly textured in the direction perpendicular to the sample surface, and present a good interface quality with small roughness and interdiffusion. We have found that in the trilayers, the ferromagnetic electrodes are ferromagnetically coupled for thin spacer layers and becomes decoupled for spacer thickness larger than 3 nm. Instead, the others multilayers are ferromagnetic for all spacer thicknesses and temperature range. This result was expected for temperatures well below the spacer Curie temperature. We attributed the ferromagnetic behavior of the system, found for temperatures above the ordering temperature of the spacer, to direct exchange coupling through short-range ordered zones in spacer layer. As expected from magnetization results, in fact, no extrinsic magnetoresistance was measured in these systems in the temperature range between 4.2 and 300 K.
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15 May 2003
47th Annual Conference on Magnetism & Magnetic Materials
11-15 November 2002
Tampa, Florida (USA)
Research Article|
May 09 2003
Correlation between structure and magnetic properties of manganite-based multilayers
M. Sirena;
M. Sirena
Instituto Balseiro and Centro Atómico Bariloche, C.N.E.A-UNC (8400) San Carlos de Bariloche, Argentina
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N. Haberkorn;
N. Haberkorn
Instituto Balseiro and Centro Atómico Bariloche, C.N.E.A-UNC (8400) San Carlos de Bariloche, Argentina
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M. Granada;
M. Granada
Instituto Balseiro and Centro Atómico Bariloche, C.N.E.A-UNC (8400) San Carlos de Bariloche, Argentina
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L. B. Steren;
L. B. Steren
Instituto Balseiro and Centro Atómico Bariloche, C.N.E.A-UNC (8400) San Carlos de Bariloche, Argentina
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J. Guimpel
J. Guimpel
Instituto Balseiro and Centro Atómico Bariloche, C.N.E.A-UNC (8400) San Carlos de Bariloche, Argentina
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J. Appl. Phys. 93, 7244–7246 (2003)
Citation
M. Sirena, N. Haberkorn, M. Granada, L. B. Steren, J. Guimpel; Correlation between structure and magnetic properties of manganite-based multilayers. J. Appl. Phys. 15 May 2003; 93 (10): 7244–7246. https://doi.org/10.1063/1.1543894
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