Damping parameter and interfacial perpendicular magnetic anisotropy of FeB nanopillar sandwiched between MgO barrier and cap layers in magnetic tunnel junctions

We systematically investigated the Gilbert damping (α) and interfacial perpendicular magnetic anisotropy (Ki) in magnetic tunnel junctions with a MgO-barrier/FeB/MgO-cap layered structure using the spin-torque diode effect. By increasing the MgO cap thickness, α decreased, whereas Ki increased monot...

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Published inApplied physics express Vol. 7; no. 3; pp. 33004 - 33006
Main Authors Tsunegi, Sumito, Kubota, Hitoshi, Tamaru, Shingo, Yakushiji, Kay, Konoto, Makoto, Fukushima, Akio, Taniguchi, Tomohiro, Arai, Hiroko, Imamura, Hiroshi, Yuasa, Shinji
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.03.2014
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Summary:We systematically investigated the Gilbert damping (α) and interfacial perpendicular magnetic anisotropy (Ki) in magnetic tunnel junctions with a MgO-barrier/FeB/MgO-cap layered structure using the spin-torque diode effect. By increasing the MgO cap thickness, α decreased, whereas Ki increased monotonically. Values down to 0.0054 for α and up to 3.3 erg/cm2 for Ki were obtained for a MgO cap thickness of 0.6 nm. The small α and large Ki suggest that MgO-capped FeB is a suitable free layer for spintronics devices such as spin-torque oscillators and spin-torque magnetic random access memories.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.7.033004