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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|
|Keywords:||multiferroic, ferromagnet, oxide, SEMPA, PFM, XLD|
|PDF version:||Click here to retrieve PDF version of paper (2MB)|