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Spin control by application of electric current and voltage in FeCo–MgO junctions by Yoshishige Suzuki, Hitoshi Kubota, Ashwin Tulapurkar, and Takayuki.

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Presentation on theme: "Spin control by application of electric current and voltage in FeCo–MgO junctions by Yoshishige Suzuki, Hitoshi Kubota, Ashwin Tulapurkar, and Takayuki."— Presentation transcript:

1 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 A Volume 369(1951):3658-3678 September 28, 2011 ©2011 by The Royal Society

2 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

3 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

4 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

5 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

6 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

7 (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

8 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

9 Schematic of the sample stack. Yoshishige Suzuki et al. Phil. Trans. R. Soc. A 2011;369:3658-3678 ©2011 by The Royal Society

10 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

11 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

12 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

13 (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

14 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


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