Abstract
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.
Highlights
Controlled magnetic interlayer coupling has enabled a broad range of new magnetic nanotechnologies
AF-coupled layers are used for free layers in field-written magneto-resistance random access memories (MRAM) devices,[5] as longitudinal recording media[6,7,8] and as soft underlayers for perpendicular magnetic recording media.[9]
For Fe contents less than 90 at.% Fe-Ta alloys are amorphous and paramagnetic at room temperature.[16]. Such materials may be useful in optimizing perpendicular magnetic anisotropy (PMA) STT-MRAM devices
Summary
Controlled magnetic interlayer coupling has enabled a broad range of new magnetic nanotechnologies. For Fe contents less than 90 at.% Fe-Ta alloys are amorphous and paramagnetic at room temperature.[16] Such materials may be useful in optimizing perpendicular magnetic anisotropy (PMA) STT-MRAM devices.
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