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Influence of magnetic field and ferromagnetic film thickness on domain pattern transfer in multiferroic heterostructures
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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5
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Journal of Magnetism and Magnetic Materials, Volume 441, pp. 404-408
Abstract
We report on domain pattern transfer from a ferroelectric BaTiO3 substrate to a CoFeB wedge film with a thickness of up to 150 nm. Strain coupling to domains in BaTiO3 induces a regular modulation of uniaxial magnetic anisotropy in CoFeB via an inverse magnetostriction effect. As a result, the domain structures of the CoFeB wedge film and BaTiO3 substrate correlate fully and straight ferroelectric domain boundaries in BaTiO3 pin magnetic domain walls in CoFeB. We use X-ray photoemission electron microscopy and magneto-optical Kerr effect microscopy to characterize the spin structure of the pinned domain walls. In a rotating magnetic field, abrupt and reversible transitions between two domain wall types occur, namely, narrow walls where the magnetization vectors align head-to-tail and much broader walls with alternating head-to-head and tail-to-tail magnetization configurations. We characterize variations of the domain wall spin structure as a function of magnetic field strength and CoFeB film thickness and compare the experimental results with micromagnetic simulations.
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| openaire: EC/H2020/665215/EU//EMOTION | openaire: EC/FP7/307502/EU//E-CONTROL
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López González, D, Casiraghi, A, Kronast, F, Franke, K J A & van Dijken, S 2017, 'Influence of magnetic field and ferromagnetic film thickness on domain pattern transfer in multiferroic heterostructures', Journal of Magnetism and Magnetic Materials, vol. 441, pp. 404-408. https://doi.org/10.1016/j.jmmm.2017.06.004