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

作者：Tsunegi Sumito^*; Kubota Hitoshi; Tamaru Shingo; Yakushiji Kay; Konoto Makoto; Fukushima Akio; Taniguchi Tomohiro; Arai Hiroko; Imamura Hiroshi; Yuasa Shinji

来源：Applied Physics Express, 2014, 7(3): 033004.

DOI：10.7567/APEX.7.033004

We systematically investigated the Gilbert damping (alpha) and interfacial perpendicular magnetic anisotropy (k(1)) 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, alpha decreased, whereas. K-i increased monotonically. Values down to 0.0054 for a and up to 3.3 erg/cm(2) for K-1 were obtained for a MgO cap thickness of 0.6 nm. The small alpha and large K-1 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.

• 出版日期2014-3