Distribution of the magnetization reversal duration in subnanosecond spin-transfer switching

Devolder, T.; Chappert, C.; Katine, J. A.; Carey, M. J.; Ito, K.

doi:10.1103/physrevb.75.064402

Cited by 50 publications

(53 citation statements)

References 18 publications

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“…1͑e͔͒ 15,16 monotonic increase with increasing pulse amplitude. The stepped increase in P S , predicted by our simulations and previously observed in similar experiments as a function of pulse width ͑ Ͼ 100 ps͒, 17 is due to the underlying free precession orbits.…”

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confidence: 49%

“…In contrast with previous measurements where the spin torque is applied throughout a large fraction of a precession cycle, [14][15][16][17][18] in our experiments the magnetization evolves freely except for short time intervals when it is driven by the spin torque. By using ultrashort spin torque "impulses," we can access a previously unexplored regime in which nanomagnet dynamics is strongly affected by the timing of the spin torque pulses with respect to the underlying free precession orbits.…”

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confidence: 58%

“…It is known that at nonzero temperatures thermal excitations broaden the distribution of orientations of the free layer magnetization ͑M ជ ͒ around the equilibrium direction. However, reproducibility in nanomagnet switching can be increased by applying transverse fields 17 or through interlayer coupling. 9 Throughout our measurements we apply in-plane transverse fields H Ќ ϳ 175 Oe to shift the P and AP fixed points of M ជ away from the easy axis ͓Fig.…”

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Coherent control of nanomagnet dynamics via ultrafast spin torque pulses

Garzon

Webb

et al. 2008

Phys. Rev. B

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The magnetization orientation of a nanoscale ferromagnet can be manipulated using an electric current via the spin transfer effect. Time domain measurements of nanopillar devices at low temperatures have directly shown that magnetization dynamics and reversal occur coherently over a timescale of nanoseconds. By adjusting the shape of a spin torque waveform over a timescale comparable to the free precession period (100-400 ps), control of the magnetization dynamics in nanopillar devices should be possible. Here we report coherent control of the free layer magnetization in nanopillar devices using a pair of current pulses as narrow as 30 ps with adjustable amplitudes and delay. We show that the switching probability can be tuned over a broad range by timing the current pulses with the underlying free-precession orbits, and that the magnetization evolution remains coherent for more than 1 ns even at room temperature. Furthermore, we can selectively induce transitions along free-precession orbits and thereby manipulate the free magnetic moment motion. We expect this technique will be adopted for further elucidating the dynamics and dissipation processes in nanomagnets, and will provide an alternative for spin torque driven spintronic devices, such as resonantly pumping microwave oscillators, and ultimately, for efficient reversal of memory bits in magnetic random access memory (MRAM).Comment: 4 pages, 3 figures, submitted to Nature Physic

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confidence: 58%

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Coherent control of nanomagnet dynamics via ultrafast spin torque pulses

Garzon

Webb

et al. 2008

Phys. Rev. B

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“…Indeed, in addition to the Giant Magneto Resistance (GMR 1,2 ) and Tunneling Magneto Resistance (TMR [3][4][5] ) effects observed in the collinear configuration, the non conservation of spin current gives rise to an influence of electronic transport on the magnetization dynamics which itself can lead to various phenomena such as magnetization reversal [6][7][8][9] or dc driven radio frequency oscillators [10][11][12][13][14] . The potential for applications opened by these effects (magnetic memories, reprogrammable logic, tunable rf sources...) has been recognized very early and lead to an important expansion of the field 15 .…”

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confidence: 99%

Multiscale approach to spin transport in magnetic multilayers

et al. 2011

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This article discusses two dual approaches to spin transport in magnetic multilayers: a direct, purely quantum, approach based on a Tight-Binding model (TB) and a semiclassical approach (Continuous Random Matrix Theory, CRMT). The combination of both approaches provides a systematic way to perform multi-scales simulations of systems that contain relevant physics at scales larger (spin accumulation, spin diffusion...) and smaller (specular reflexions, tunneling...) than the elastic mean free paths of the layers. We show explicitly that CRMT and TB give consistent results in their common domain of applicability.

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“…5 Current induced magnetization dynamic on short time scales in nanopillar has been reported. 6,7 The StonerWohlfarth model is generally not applied on the basis that spin torque is a non-energy-conserving torque. In this Rapid Communication, we show how to include spin-transfer torque into the Stoner-Wohlfarth model.…”

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confidence: 99%