Paramagnetic FexTa1-x alloys for engineering of perpendicularly magnetized tunnel junctions | Zendy

M. Gottwald | Zendy; Jimmy J. Kan | Zendy; Kangho Lee | Zendy; Seung H. Kang | Zendy; Eric E. Fullerton | Zendy

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Paramagnetic FexTa1-x alloys for engineering of perpendicularly magnetized tunnel junctions

Author(s) -

M. Gottwald,

Jimmy J. Kan,

Kangho Lee,

Seung H. Kang,

Eric E. Fullerton

Publication year - 2013

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4817897

Subject(s) - materials science , ferromagnetism , annealing (glass) , paramagnetism , condensed matter physics , tunnel magnetoresistance , amorphous solid , perpendicular , coupling (piping) , magnetic shape memory alloy , alloy , magnetic domain , magnetization , metallurgy , magnetic field , crystallography , geometry , mathematics , chemistry , physics , quantum mechanics

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

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