Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

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© 2015 American Physical Society (APS). This is the accepted version of the following article: Casiraghi, Arianna & Rincón Domínguez, Teresa & Rößler, Stefan & Franke, Kévin J. A. & López González, Diego & Hämäläinen, Sampo J. & Frömter, Robert & Oepen, Hans Peter & van Dijken, Sebastiaan. 2015. Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures. Phys. Rev. B. Volume 92, Issue 5. ISSN 2469-9950 (printed). DOI: 10.1103/physrevb.92.054406, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.054406.

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Volume Title

School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2015

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Mcode

Degree programme

Language

en

Pages

054406/1-8

Series

Physical Review B, Volume 92, Issue 5

Abstract

In elastically coupled multiferroic heterostructures that exhibit full domain correlations between ferroelectricand ferromagnetic subsystems, magnetic domain walls are firmly pinned on top of ferroelectric domainboundaries. In this work, we investigate the influence of pinned magnetic domain walls on the magnetizationreversal process in a Co40Fe40B20 wedge film that is coupled to a ferroelectric BaTiO3 substrate via interfacestrain transfer.We show that the magnetic field direction can be used to select between two distinct magnetizationreversal mechanisms, namely, (1) double switching events involving alternate stripe domains at a time or(2) synchronized switching of all domains. Furthermore, scaling of the switching fields with domain widthand film thickness is also found to depend on the field orientation. These results are explained by considering the dissimilar energies of the two types of pinned magnetic domain walls that are formed in the system.

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Keywords

magnetic anisotropy, magnetic switching, ferroelectric-ferromagnetic heterostructures

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Citation

Casiraghi, Arianna & Rincón Domínguez, Teresa & Rößler, Stefan & Franke, Kévin J. A. & López González, Diego & Hämäläinen, Sampo J. & Frömter, Robert & Oepen, Hans Peter & van Dijken, Sebastiaan. 2015. Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures. Physical Review B. Volume 92, Issue 5. 054406/1-8. 2469-9950 (printed). DOI: 10.1103/physrevb.92.054406.