Microscopic approach to current-driven domain wall dynamics

Tatara, Gen; Kohno, Hiroshi; Shibata, Junya

doi:10.1016/j.physrep.2008.07.003

Cited by 436 publications

(619 citation statements)

References 185 publications

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“…1,2,3,4,5,6 Electrical spin injection in normal metal is usually achieved by driving a current through ferromagnet/normal metal junction. Recently, spin orbit interaction (SOI) in metal and semiconductors has attracted significant attention in the field of spintronics, since it allows for electrical control of spin without the use of ferromagnets or a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Charge transport in ferromagnetic semiconductor/s-wave superconductor junction

Mizuno

Yokoyama

Tanaka

2009

Physica C: Superconductivity

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We study tunneling conductance in ferromagnetic semiconductor/insulator/s-wave superconductor junction where Rashba spin-orbit interaction (RSOI) and exchange field are taken into account in the ferromagnetic semiconductor. We show that normalized conductance at zero voltage has a maximum as a function of RSOI for high transparent interface and finite exchange field. This is because Andreev reflection probability shows a nonmonotonic dependence on RSOI in the presence of the exchange field. On the other hand, for intermediate transparent interface, normalized conductance at zero voltage has a reentrant shape at zero or small exchange field with increasing RSOI but is monotonically increasing by RSOI at large exchange field.

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Section: Introductionmentioning

confidence: 99%

Charge transport in ferromagnetic semiconductor/s-wave superconductor junction

Mizuno

Yokoyama

Tanaka

2009

Physica C: Superconductivity

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“…For this purpose, we introduce a unitary transformation in spin space as c l (r) = U(r)a l (r), where U is a 2 × 2 unitary matrix satisfying U † (n · σ)U = σ z . 33) An explicit form of U is given as U = m · σ with m ≡ (sin θ 2 cos φ, sin θ 2 sin φ, cos θ 2 ). Geometrically, U rotates the spin space by π around the m-axis.…”

Section: Perturbation With Respect To Spin Gauge Fieldmentioning

confidence: 99%

First-Principles Evaluation of the Dzyaloshinskii–Moriya Interaction

2018

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We review recent developments of formulations to calculate the Dzyaloshinskii-Moriya (DM) interaction from first principles. In particular, we focus on three approaches. The first one evaluates the energy change due to the spin twisting by directly calculating the helical spin structure. The second one employs the spin gauge field technique to perform the derivative expansion with respect to the magnetic moment. This gives a clear picture that the DM interaction can be represented as the spin current in the equilibrium within the first order of the spin-orbit couplings. The third one is the perturbation expansion with respect to the exchange couplings and can be understood as the extension of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction to the noncentrosymmetric spin-orbit systems. By calculating the DM interaction for the typical chiral ferromagnets Mn 1−x Fe x Ge and Fe 1−x Co x Ge, we discuss how these approaches work in actual systems.

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“…It may also find use in storage and logic devices in which the domain wall is used as the information unit (for comprehensive reviews about current-induced domain wall motion based on local spin transfer torque, please see Refs. [83][84][85][86][87]). …”

Section: Current-induced Motion Of a Domain Wallmentioning

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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Microscopic approach to current-driven domain wall dynamics

Cited by 436 publications

References 185 publications

Charge transport in ferromagnetic semiconductor/s-wave superconductor junction

Charge transport in ferromagnetic semiconductor/s-wave superconductor junction

First-Principles Evaluation of the Dzyaloshinskii–Moriya Interaction

Self-consistent calculation of spin transport and magnetization dynamics

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