Precessional reversal in orthogonal spin transfer magnetic random access memory devices

Liu, H.; Bedau, D.; Backes, Dirk; Katine, J. A.; Kent, Andrew D.

doi:10.1063/1.4737010

Cited by 31 publications

(22 citation statements)

References 10 publications

(10 reference statements)

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“…Moreover, the reliable ultrafast precessional reveral has been achieved by a picosecond spin-polarized current pulse in the spin valves and magnetic tunnel junctions. [15][16][17][18][19][20][21] It has been demonstrated theoretically and experimentally that the accurate control of the pulse duration is necessary to realize a reliable precessional reversal either by magnetic field or by spinpolarized current. There is a time window for the pulse duration.…”

Section: Introductionmentioning

confidence: 99%

Effects of spin-polarized current on pulse field-induced precessional magnetization reversal

et al. 2012

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We investigate effects of a small DC spin-polarized current on the pulse field-induced precessional magnetization reversal in a thin elliptic magnetic element by micromagnetic simulations. We find that the spin-polarized current not only broadens the time window of the pulse duration, in which a successful precessional reversal is achievable, but also significantly suppresses the magnetization ringing after the reversal. The pulse time window as well as the decay rate of the ringing increase with increasing the current density. When a spin-polarized current with 5 MA/cm2 is applied, the time window increases from 80 ps to 112 ps, and the relaxation time of the ringing decreases from 1.1 ns to 0.32 ns. Our results provide useful information to achieve magnetic nanodevices based on precessional switching

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Section: Introductionmentioning

confidence: 99%

Effects of spin-polarized current on pulse field-induced precessional magnetization reversal

et al. 2012

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“…This is particularly relevant to experiments employing a perpendicular polarizer layer with an in-plane magnetized spinvalve, consisting of a free and reference layer [31][32][33][34][35][36][37] . In this case, the effective spin-polarization will be tilted with respect to the easy-axis of the free layer.…”

Section: General Formalismmentioning

confidence: 99%

Spin-torque oscillators with thermal noise: A constant energy orbit approach

2014

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We study the magnetization dynamics of spin torque oscillators in the presence of thermal noise and as a function of the spin-polarization angle in a macrospin model. The macrospin has biaxial magnetic anisotropy, typical of thin film magnetic elements, with an easy axis in the film plane and a hard axis out of the plane. Using a method that averages the energy over precessional orbits, we derive analytic expressions for the current that generates and sustains out-of-plane precessional states. We find that there is a critical angle of the spin-polarization necessary for the occurrence of such states and predict a hysteretic response to applied current. This model can be tested in experiments on orthogonal spin-transfer devices, which consist of both an in-plane and out-of-plane magnetized spin-polarizers, effectively leading to an angle between the easy and spin-polarization axes.

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“…Next, we consider a particular physical situation in which to study the macrospin equation, motivated by previous work 10,11 . As in Refs.…”

Section: A Derivation Of Macrospin Modelmentioning

confidence: 99%

“…A device in which a perpendicular component of spin-polarization is applied to an in-plane magnetized element was proposed in Ref. [9] and has been studied experimentally [10][11][12] . There have also been a number of models that have considered the influence of thermal noise on the resulting dynamics, e.g., on the rate of switching and the dephasing of the oscillator motion [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Reduced model for precessional switching of thin-film nanomagnets under the influence of spin torque

et al. 2016

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We study the magnetization dynamics of thin-film magnetic elements with in-plane magnetization subject to a spin-current flowing perpendicular to the film plane. We derive a reduced partial differential equation for the in-plane magnetization angle in a weakly damped regime. We then apply this model to study the experimentally relevant problem of switching of an elliptical element when the spin-polarization has a component perpendicular to the film plane, restricting the reduced model to a macrospin approximation. The macrospin ordinary differential equation is treated analytically as a weakly damped Hamiltonian system, and an orbit-averaging method is used to understand transitions in solution behaviors in terms of a discrete dynamical system. The predictions of our reduced model are compared to those of the full Landau-Lifshitz-Gilbert-Slonczewski equation for a macrospin.

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Precessional reversal in orthogonal spin transfer magnetic random access memory devices

Cited by 31 publications

References 10 publications

Effects of spin-polarized current on pulse field-induced precessional magnetization reversal

Effects of spin-polarized current on pulse field-induced precessional magnetization reversal

Spin-torque oscillators with thermal noise: A constant energy orbit approach

Reduced model for precessional switching of thin-film nanomagnets under the influence of spin torque

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