Influence of different buffers on magnetic dead layer, critical current and thermal stability in magnetic tunnel junctions with perpendicular magnetic anisotropy

Frankowski, Marek; Żywczak, Antoni; Czapkiewicz, M.; Ziętek, Sławomir; Kanak, J.; Banasik, Monika; Powroźnik, W.; Skowroński, Witold; Chęciński, Jakub; Wrona, Jerzy; Stobiecki, T.

doi:10.1109/intmag.2015.7157507

Cited by 2 publications

(2 citation statements)

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“…The thinner B layer has an in-plane easy axis while the T layer has a perpendicular easy axis. However, keeping in mind our former studies of a dead magnetic layer (DML) in the Ta/CoFeB/MgO (B) and MgO/CoFeB/Ta (T) structures [13] The solid lines show the fits given in accordance with Eqs. ( 1) and (2).…”

Section: Resultsmentioning

confidence: 84%

“…Hysteresis loops of the samples were measured by vibrating sample magnetometer (VSM) with the perpendicular and in-plane magnetic fields. The saturation magnetization M s of 1200 G in the as-deposited state was determined from magnetic moment per unit area vs. CoFeB thickness dependencies [13]. To investigate anisotropy and damping in studied samples, vector network analyzer ferromagnetic resonance (VNA-FMR) spectra of the S 21 parameter were analyzed [14].…”

Section: Experimental Methodsmentioning

confidence: 99%

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CoFeB/MgO/CoFeB structures with orthogonal easy axes: perpendicular anisotropy and damping

Głowiński

Żywczak²,

Wrona³

et al. 2017

J. Phys.: Condens. Matter

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We report on the Gilbert damping parameter α, the effective magnetization [Formula: see text], and the asymmetry of the g-factor in bottom-CoFeB(0.93 nm)/MgO(0.90-1.25 nm)/CoFeB(1.31 nm)-top as-deposited systems. Magnetization of CoFeB layers exhibits a specific noncollinear configuration with orthogonal easy axes and with [Formula: see text] values of [Formula: see text] kG and [Formula: see text] kG for the bottom and top layers, respectively. We show that [Formula: see text] depends on the asymmetry [Formula: see text] of the g-factor measured in the perpendicular and the in-plane directions revealing a highly nonlinear relationship. In contrast, the Gilbert damping is practically the same for both layers. Annealing of the films results in collinear easy axes perpendicular to the plane for both layers. However, the linewidth is strongly increased due to enhanced inhomogeneous broadening.

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Section: Resultsmentioning

confidence: 84%

Section: Experimental Methodsmentioning

confidence: 99%