Thermal Spin-Transfer Torque in Magnetoelectronic Devices

Hatami, Moosa; Bauer, G.; Zhang, Qinfang; Kelly, Paul J.

doi:10.1103/physrevlett.99.066603

Cited by 284 publications

(245 citation statements)

References 36 publications

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“…Another important degree of freedom is heat. Temperature gradients across structures may also generate spin transfer torques just as voltage gradients do [171][172][173][174][175][176][177][178].…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

Self-consistent calculation of spin transport and magnetization dynamics

et al. 2013

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“…Thus a temperature gradient is also applied and a heat current is driven through the nanowire. There has been prediction that the heat current can act on the magnetization [21]. It is possible that data such as those of Fig.…”

Section: Tgv Of Spin Valvesmentioning

confidence: 99%

Heat and spin transport in magnetic nanowires

Granville

et al. 2010

Solid State Communications

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a b s t r a c tTransport measurements are carried out in which temperature oscillation is applied to magnetic nanostructures. Using spin valves, this measurement reveals aspects of the spin transport in non-collinear configurations. In one implementation, an AC voltage is detected when a DC current is driven through the nanostructure under test and its temperature is made to oscillate by illuminating it with a laser diode. A simpler approach is presented that relies on Joule heating to generate the temperature oscillation, thus eliminating the need for any optical component.

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“…The thermoelectric response of a ferromagnet|normal metal|ferromagnet spin valve [1,2,3] depends sensitively on the strength of inter-spin energy relaxation (spin thermalization) inside the normal metal spacer [4]. In large structures at high temperatures, spin thermalization is dominated by electron-phonon coupling, whereas at low temperatures direct spin-flip scattering becomes important.…”

Section: Introductionmentioning

confidence: 99%

Electron–electron interaction induced spin thermalization in quasi-low-dimensional spin valves

Heikkilä

Hatami

Bauer

2010

Solid State Communications

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We study the spin thermalization, i.e., the inter-spin energy relaxation mediated by electron-electron scattering in small spin valves. When one or two of the dimensions of the spin valve spacer are smaller than the thermal coherence length, the direct spin energy exchange rate diverges and needs to be regularized by the sample dimensions. Here we consider two model systems: a long quasi-1D wire and a thin quasi-2D sheet.

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Thermal Spin-Transfer Torque in Magnetoelectronic Devices

Cited by 284 publications

References 36 publications

Self-consistent calculation of spin transport and magnetization dynamics

Self-consistent calculation of spin transport and magnetization dynamics

Heat and spin transport in magnetic nanowires

Electron–electron interaction induced spin thermalization in quasi-low-dimensional spin valves

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