title: A 4-fold-symmetry hexagonal ruthenium for magnetic heterostructures exhibiting enhanced perpendicular magnetic anisotropy and tunnel magnetoresistance.
abstract: A 4-fold-symmetry hexagonal Ru emerging in epitaxial MgO/Ru/Co2 FeAl/MgO heterostructures is reported, in which an approximately Ru(022¯3) growth attributes to the lattice matching between MgO, Ru, and Co2 FeAl. Perpendicular magnetic anisotropy of the Co2 FeAl/MgO interface is substantially enhanced. The magnetic tunnel junctions (MTJs) incorporating this structure give rise to the largest tunnel magnetoresistance for perpendicular MTJs using low damping Heusler alloys.
authors.affiliation: National Institute for Materials Science (NIMS), Tsukuba, 305-0047, Japan.
authors.forename: Zhenchao
authors.initials: Z
authors.lastname: Wen
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Sukegawa
authors.forename: Takao
authors.initials: T
authors.lastname: Furubayashi
authors.forename: Jungwoo
authors.initials: J
authors.lastname: Koo
authors.forename: Koichiro
authors.initials: K
authors.lastname: Inomata
authors.forename: Seiji
authors.initials: S
authors.lastname: Mitani
authors.forename: Jason Paul
authors.initials: JP
authors.lastname: Hadorn
authors.forename: Tadakatsu
authors.initials: T
authors.lastname: Ohkubo
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Hono
keywords: 4-fold-symmetry hexagonal ruthenium; magnetic heterostructures; perpendicular magnetic anisotropy; tunnel magnetoresistance