Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3064162
Keywords
annealing; cobalt; magnetic multilayers; magnetic tunnelling; perpendicular magnetic anisotropy; platinum; superparamagnetism; thermal stability
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This letter presents a study of perpendicular magnetic anisotropy in oxide/Co/Pt structures, which could constitute the upper magnetic electrode of magnetic tunnel junctions. The growth of cobalt layers on SiO2 substrates shows that all 0.6 nm thick Co films are superparamagnetic, whereas perpendicular magnetic anisotropy is obtained for 1.5 nm films after annealing. Co layers grown on various Al and Mg oxides prepared by sputtering also exhibit perpendicular magnetic anisotropy after annealing. Combined with inverse Pt/Co(CoFeB)/oxide stackings, these structures allow preparing tunnel junctions with thicker magnetic electrodes and much better thermal stability than those based on standard Pt/Co multilayers.
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