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Integration of Multiferroic BiFeO _3 Thin Films into Heterostructures for Spintronics

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9 Author(s)
Bea, H. ; Unite Mixte de Phys., CNRS-Thales, Palaiseau ; Bibes, M. ; Herranz, G. ; Xiao-Hong Zhu
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The revival of multiferroics is motivated by their exciting physics and their ability to bring novel functionalities to a number of technological fields such as spintronics. The lack of room temperature ferroelectric ferromagnets is a problem and has driven most of the attention thus far to BiFeO3, a ferroelectric weak-ferromagnet with both transition temperatures superior to 300 K. In this paper, we report on the properties of BiFeO3 heterostructures and focus on two types of approaches towards BiFeO3-based spintronics devices. One uses BiFeO3 as an exchange bias layer in spin-valve structures in which the magnetic configuration is potentially switchable by an electric field, via the magnetoelectric coupling existing in BiFeO3. The other consists in integrating BiFeO3 ultrathin films as tunnel barriers in magnetic tunnel junctions with the objective of exploiting their ferroelectric character along with their specific symmetry filtering properties. General perspectives for multiferroics in spintronics are given.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 7 )

Date of Publication:

July 2008

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