Paramagnetic Fe_xTa_{1-x} alloys for engineering of perpendicularly magnetized tunnel junctions

Exchange coupling between two magnetic layers through an interlayer is of broad interest for numerous recent applications of nano-magnetic systems. In this Letter we study ferromagnetic exchange coupling through amorphous paramagnetic Fe-Ta alloys. We show that the exchange coupling depends exponent...

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Bibliographic Details
Published in:arXiv.org 2013-04
Main Authors: Gottwald, Matthias, Kan, Jimmy J, Lee, Kangho, Kang, Seung H, Fullerton, Eric E
Format: Article
Language:English
Subjects:
Coupling
Crystal lattices
Diffusion barriers
Diffusion layers
Exchanging
Ferromagnetism
Interlayers
Magnetic permeability
Tunnel junctions
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Summary:Exchange coupling between two magnetic layers through an interlayer is of broad interest for numerous recent applications of nano-magnetic systems. In this Letter we study ferromagnetic exchange coupling through amorphous paramagnetic Fe-Ta alloys. We show that the exchange coupling depends exponentially on spacer thickness and scales with the Fe-Ta susceptibility, which can be tuned via the alloy composition and/or temperature. Such materials are of high interest for the engineering of perpendicularly magnetized CoFeB-MgO based tunnel junctions as it enables ferromagnetic coupling of magnetic layers with differing crystalline lattices, suppresses dead layers and can act as an inter-diffusion barrier during annealing.
ISSN:2331-8422