ENHANCED MAGNETIZATION IN BiFeO3/BaTiO3 MULTILAYERS: AN INTERFACE EFFECT?

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Abstract:

We have used pulsed laser deposition to grow BiFeO3/BaTiO3 multilayers on SrTiO3 substrates. The samples are characterized by Reflection High Energy Electron Diffraction (RHEED), Atomic Force Microscopy (AFM), and by X-ray diffraction measurements and modelling. The two multilayers investigated here have modulation periods A = 90Å and 180Å, while the total thickness of 1800Å is the same for both samples. Hence, twice as many interfaces are encountered for the A = 90Å than for the A = 180Å sample. SQUID magnetometer measurements performed on these multiferroic samples show that the magnetization is significantly larger for the smaller wavelength sample thus pointing to a multilayer effect between the magnetic susceptibility and the number of interfaces per unit volume.

Keywords: BiFeO3 thin films; X-ray diffraction; antiferromagnetic susceptibility; multiferroics; multilayers; pulsed laser deposition

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10584580802541023

Affiliations: 1: Laboratoire de Physique de la Matiere Condensee, Universite de Picardie Jules Verne, Amiens, France 2: Angewandte Physik, Universitat Duisburg-Essen, Duisburg, Germany

Publication date: January 1, 2008

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