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Prieto, P., M. E. Gomez, G. Campillo, A. Berger, E. Baca, R. Escudero, F. Morales, J. Guimpel, and N. Haberkorn. "Exchange-coupling effect and magnetotransport properties in epitaxial La2/3Ca1/3MnO3/La1/3Ca2/3MnO3 superlattices." PHYSICA STATUS SOLIDI A-APPLIED RESEARCH 201, no. 10 (2004): 2343–2346.
Abstract: We have measured structural, magnetic and, magneto transport properties of heterostructures consisting of La1-xCaxMnO3 ferromagnetic (FM) layers (x = 0.33) and antiferromagnetic (AF) layers (x = 0.67). FM/AF superlattices were grown by a high-pressure sputtering technique on (001) oriented SrTiO3 substrates. We have systematically varied the thickness of the ferromagnetic layers, while maintaining the thickness of the antiferromagnetic layers fixed. The total superlattice thickness was held approximately constant. The XRD analysis confirmed the existence of the superlattice structure by the multiple satellite peaks around the 001 manganite Bragg reflections. We have done field cooling (FC) and zero field cooling (ZFC) magnetization, and magneto resistance measurements at temperatures between 10 K and 280 K. The existence of an exchange bias effect at temperatures below the Neel temperature of the AF layer was revealed by magnetization loops after field cooling. The exchange bias field magnitude H-ex exhibited exponential temperature dependence below the blocking temperature, as well as an inverse proportionality with the ferromagnetic layer thickness. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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