Current-Driven Magnetization Reversal and Spin-Wave Excitations in Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>/</mml:mi></mml:math>Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>/</mml:mi></mml:math>Co Pillars

Katine, J. A.; Albert, F. J.; Buhrman, R. A.; Myers, E.; Ralph, Daniel

doi:10.1103/physrevlett.84.3149

Cited by 1,854 publications

(1,388 citation statements)

References 20 publications

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“…All these phenomena have been observed in magnetic metallic multilayers [5,6]. However, similar phenomena also can be observed in other kinds of artificial magnetic systems, for instance in planar single-barrier tunnel junctions, planar doublebarrier tunnel junctions, mesoscopic double-barrier junctions in the form of a single-electron transistor, etc.…”

Section: Introductionmentioning

confidence: 86%

“…This appears as a torque exerted locally on the magnetization. In spin valve structures the spin-transfer torque may lead to the phenomenon of current-induced magnetic switching (CIMS), predicted first theoretically [4], and then confirmed experimentally [5]. The magnetic switching can be detected by measuring resistance change of the system.…”

Section: Influence Of Current On Magnetic Statementioning

confidence: 99%

“…Figure 1 implies that a positive current (I > 0) tends to destabilize the parallel configuration and can switch it to antiparallel one when current exceeds a certain threshold value. On the other hand a negative current tends to destabilize the antiparallel configuration and stabilize the parallel one [5,7]. When positive current (flowing from the reference towards the sensing layer) causes transition to antiparallel magnetic configuration, the switching is known as normal CIMS.…”

Section: Influence Of Current On Magnetic Statementioning

confidence: 99%

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Spin-Dependent Phenomena in Magnetoelectronic Devices

et al. 2007

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Section: Introductionmentioning

confidence: 86%

Section: Influence Of Current On Magnetic Statementioning

confidence: 99%

Section: Influence Of Current On Magnetic Statementioning

confidence: 99%

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Spin-Dependent Phenomena in Magnetoelectronic Devices

et al. 2007

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“…The most suitable devices for experimental observation of the effect are spin valves [2]. In typical spin valves the switching between low and high resistive states has been observed for currents exceeding a critical value and for sufficiently low external fields.…”

Section: Introductionmentioning

confidence: 99%

Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves

Gmitra

Barnaś

2007

Acta Phys. Pol. A

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Within the macroscopic model we have calculated spin-transfer torque in asymmetric spin valves in the diffusive transport limit.Such systems exhibit a non-standard angular dependence of the torque, which leads to currentinduced precessional modes at zero external magnetic field. We have found that the frequency of magnetoresistance oscillations exhibits hysteretic behavior when the system is driven between two steady precessional regimes. A finite temperature can suppress the irreversibility and give rise to bistable regime where, both the precessional regimes coexist.

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“…The spin-polarized current exerts a torque on the non-collinear magnetization by transferring its transverse spin-angular momentum. Spin transfer torques generate a wide variety of magnetization dynamics such as full reversal of magnetization [5,6], steady-state precession [7][8][9][10], domain wall motion [11,12], and modification of spin waves [13,14].…”

Section: Introductionmentioning

confidence: 99%

Self-consistent calculation of spin transport and magnetization dynamics

et al. 2013

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A spin-polarized current transfers its spin-angular momentum to a local magnetization, exciting various types of current-induced magnetization dynamics. So far, most studies in this field have focused on the direct effect of spin transport on magnetization dynamics, but ignored the feedback from the magnetization dynamics to the spin transport and back to the magnetization dynamics. Although the feedback is usually weak, there are situations when it can play an important role in the dynamics. In such situations, simultaneous, self-consistent calculations of the magnetization dynamics and the spin transport can accurately describe the feedback. This review describes in detail the feedback mechanisms, and presents recent progress in self-consistent calculations of the coupled dynamics. We pay special attention to three representative examples, where the feedback generates non-local effective interactions for the magnetization after the spin accumulation has been integrated out. Possibly the most dramatic feedback example is the dynamic instability in magnetic nanopillars with a single magnetic layer. This instability does not occur without non-local feedback. We demonstrate that full self-consistent calculations generate simulation results in much better agreement with experiments than previous calculations that addressed the feedback effect approximately.The next example is for more typical spin valve nanopillars. Although the effect of feedback is less dramatic because even without feedback the current can make stationary states unstable and induce magnetization oscillation, the feedback can still have important consequences. For instance, we show that the feedback can reduce the linewidth of oscillations, in agreement with experimental observations. A key aspect of this reduction is the suppression of the excitation of short wave length spin waves by the non-local feedback.Finally, we consider nonadiabatic electron transport in narrow domain walls. The non-local feedback in these systems leads to a significant renormalization of the effective nonadiabatic 3 spin transfer torque. These examples show that the self-consistent treatment of spin transport and magnetization dynamics is important for understanding the physics of the coupled dynamics and for providing a bridge between the ongoing research fields of current-induced magnetization dynamics and the newly emerging fields of magnetization-dynamics-induced generation of charge and spin currents.

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Current-Driven Magnetization Reversal and Spin-Wave Excitations in Co/Cu/Co Pillars

Cited by 1,854 publications

References 20 publications

Spin-Dependent Phenomena in Magnetoelectronic Devices

Spin-Dependent Phenomena in Magnetoelectronic Devices

Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves

Self-consistent calculation of spin transport and magnetization dynamics

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