Spin control by application of electric current and voltage in FeCo–MgO junctions

by Yoshishige Suzuki, Hitoshi Kubota, Ashwin Tulapurkar, and Takayuki Nozaki

Philosophical Transactions AVolume 369(1951):3658-3678

September 28, 2011

©2011 by The Royal Society

Typical structure of a magnetic tunnel junction (MTJ) nanopillar designed for spin-injection magnetization switching (SIMS) experiments.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Typical SIMS hysteresis loop obtained for a CoFeB/MgO/CoFeB MTJ. The junction area, free-layer thickness, resistance × area product and MR are 100×200 nm, 3 nm, 3 Ω μm2 and about 100

per cent, respectively.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Comparison of the magnetization processes driven by (a) spin-transfer torque and (b) external magnetic field, for in-plane magnetized nanopillars.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Schematic of a magnetic nanopillar consisting of two ferromagnetic layers separated by a barrier layer.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Schematic of the spin-torque diode effect: (a) negative current; (b) null current; and (c) positive current.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

(a) Measurement set-up for the spin-torque diode effect measurements.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Bias dependence of (a) the spin-transfer torque and (b) the field-like torque.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Schematic of the sample stack.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Thickness dependence of magnetic hysteresis curves of the ultrathin FeCo layer sandwiched between Au and MgO layers.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Magnetic hysteresis curves of a 0.58 nm thick FeCo layer, measured under various applied bias voltages.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Schematic of the voltage-induced magnetic anisotropy change.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

(a) Magnetic hysteresis curves of a 0.48 nm thick FeCo layer measured under bias voltages of ±200 V.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society

Macro-spin model simulation of voltage-induced dynamic magnetization switching.

Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678

©2011 by The Royal Society