Ultrafast switching of a nanomagnet by a combined out-of-plane and in-plane polarized spin current pulse
TLDR
In this article, an out-of-plane polarizer (OPP) was used to quickly excite spin torque (ST) switching and an IPP/analyzer (IPP) was added to accelerate spin torque switching.Abstract:
We report on spin valve devices that incorporate both an out-of-plane polarizer (OPP) to quickly excite spin torque (ST) switching and an in-plane polarizer/analyzer (IPP) For pulses <200 ps, we observe reliable precessional switching due largely to ST from the OPP Compared to a conventional spin valve, for a given current amplitude from ∼2 to 3 times the zero-thermal-fluctuation critical current (Ic0), the addition of the OPP can decrease the pulse width necessary for switching by a factor of 10 or more The effect of the IPP also has beneficial ST consequences for the short pulse switching behaviorread more
Citations
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References
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TL;DR: This work presents the realization of an STO that contains a perpendicular spin current polarizer combined with an in-plane magnetized free layer, characterized by high-frequency oscillations of the free-layer magnetization, consistent with out-of-plane steady-state precessions induced at the threshold current by a spin-transfer torque from perpendicularly polarized electrons.
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Time-Domain Measurements of Nanomagnet Dynamics Driven by Spin-Transfer Torques
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TL;DR: Time-resolved measurements of spin-transfer-induced (STI) magnetization reversal were made in current-perpendicular spin-valve nanomagnetic junctions subject to a pulsed current bias and demonstrate that spin- transfer induced excitation is responsible for the observed magnetic reversal in these samples.
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Device implications of spin-transfer torques
TL;DR: In this paper, the authors examine spin-transfer torques from the perspective of three technological applications: hard disk drives, magnetic random access memory (MRAM), and current-tunable high-frequency oscillators.