Detailed magnetic and structural properties of exchange-biased La 1-xCaxMnO3

M. E. Gómez, G. Campillo, J. G. Ramirez, Axel Friedrich Hoffmann, J. Guimpel

Research output: Contribution to journalConference articlepeer-review

Abstract

We 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). We grew FM/AF superlattices via a high-pressure sputtering technique on (001) oriented SrTiO3 substrates. We systematically varied the thickness of the ferromagnetic layers, while maintaining a fixed thickness of the antiferromagnetic layers. Alternatively, we also varied the thickness of the antiferromagnetic layers, keeping a fixed ferromagnetic layer thickness. The total superlattice thickness was kept approximately constant. XRD analysis confirms the existence of the superlattice structure by the observation of multiple satellite peaks around the (001) manganite Bragg reflections. We extracted the average lattice parameter of the superlattice and its dependence on the thicknesses of the ferro- and antiferromagnetic layers. We conducted field cooling (FC) and zero field cooling (ZFC), magneto-thermal, and magneto-resistance measurements. The existence of an exchange bias effect at temperatures below the Néel temperature of the AF layer was revealed by magnetization loops measured after FC. We studied the dependence of magnetic parameters on the thicknesses of the ferro- and antiferromagnetic layers. We found that the structural, magnetization, and magneto transport properties as functions of F-layer thickness are all correlated.

Original languageEnglish (US)
Pages (from-to)4181-4187
Number of pages7
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume4
Issue number11
DOIs
StatePublished - Dec 1 2007
Externally publishedYes
EventCIAM Workshop Trends on Novel Materials, TNM - Santa Marta, Colombia
Duration: Oct 16 2006Oct 20 2006

ASJC Scopus subject areas

  • Condensed Matter Physics

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