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Publication Citation: Interfacial Coupling in Multiferroic/Ferromagnet Heterostructures

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Author(s): M. Trassin; J. D. Clarkson; Samuel R. Bowden; j. Liu; J. T. Heron; R. J. Paull; Elke Arenholz; Daniel T. Pierce; John Unguris;
Title: Interfacial Coupling in Multiferroic/Ferromagnet Heterostructures
Published: April 30, 2013
Abstract: We report local probe investigations of the magnetic interaction between BiFeO3 films and a ferromagnetic Co0.9Fe0.1 layer. Within the constraints of intralayer exchange coupling in the Co0.9Fe0.1, the multiferroic imprint in the ferromagnet results in a collinear arrangement of the local magnetization and the in-plane BiFeO3 ferroelectric polarization. An in-plane effective coupling field of order 10 mT is derived. Measurements as a function of multiferroic layer thickness find that the influence of the multiferroic layer on the magnetic layer becomes negligible for 3 nm thick BiFeO3 films. We ascribe this breakdown in the exchange coupling to a weakening of the antiferromagnetic order in the ultrathin BiFeO3 film based on our X-ray linear dichroism measurements. These observations are consistent with an interfacial exchange coupling between the CoFe moments and a canted antiferromagnetic moment in the BiFO3.
Citation: Physical Review B
Volume: 87
Issue: 13
Keywords: multiferroic; ferromagnet; oxide; SEMPA; PFM; XLD
Research Areas: Nanomagnetics
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