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Paper detail

A 4-fold-symmetry hexagonal ruthenium for magnetic heterostructures exhibiting enhanced perpendicular magnetic anisotropy and tunnel magnetoresistance

An unusual crystallographic orientation of hexagonal Ru with a 4-fold symmetry emerging in epitaxial MgO/Ru/Co2FeAl/MgO heterostructures is reported, in which an approximately Ru(02-23) growth attributes to the lattice matching among MgO, Ru, and Co2FeAl. Perpendicular magnetic anisotropy of the Co2FeAl/MgO interface is substantially enhanced as compared with those with a Cr(001) layer. The MTJs incorporating this structure gave rise to the largest tunnel magnetoresistance for perpendicular MTJs using low damping Heusler alloys. The 4-fold-symmetry hexagonal Ru arises from an epitaxial growth with an unprecedentedly high crystal index, opening a unique pathway for the development of perpendicular anisotropy films of cubic and tetragonal ferromagnetic alloys.

preprint2014arXivOpen access
Zhenchao WenHiroaki SukegawaTakao FurubayashiJungwoo KooKoichiro InomataSeiji MitaniJason Paul HadornTadakatsu OhkuboKazuhiro Hono
cond-mat.mtrl-sci
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Zhenchao WenHiroaki SukegawaTakao FurubayashiJungwoo KooKoichiro InomataSeiji MitaniJason Paul HadornTadakatsu OhkuboKazuhiro Hono

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