Spin and charge transport induced by gauge fields in a ferromagnet

Shibata, Junya; Kohno, Hiroshi

doi:10.1103/physrevb.84.184408

Cited by 26 publications

(31 citation statements)

References 53 publications

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“…35 Therefore, j s consists of two parts; the ordinary (local) current, (39) is thus a natural extension of the previous current-induced torque which contained only j (L) s . It is reciprocal to the spin motive force induced by magnetization dynamics 31 . These are the main results of this paper.…”

Section: Calculation Of Spin Torquementioning

confidence: 99%

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Spin torques due to diffusive spin current in magnetic texture

et al. 2013

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We present a microscopic theory of spin torque due to diffusive spin currents induced by spin accumulation. The obtained expression is a natural extension of the existing one due to 'local' spin currents associated with ordinary electric currents, and is the reciprocal of the spin motive force which induces charge accumulation as studied recently [J. Shibata and H. Kohno, Phys. Rev. B84, 184408 (2011)]. The result is applied to a domain wall motion in a nonlocal spin injection system, and the torque and force due to diffusive spin current are evaluated.

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Section: Calculation Of Spin Torquementioning

confidence: 99%

“…In this context, two of the present authors studied microscopically the spin and charge transport induced by magnetization dynamics 31 . They obtained a 'local' charge current, j (L) = σ s E s , driven by a spin motive force field [24][25][26][27][28][29] …”

Section: Introductionmentioning

confidence: 99%

Spin torques due to diffusive spin current in magnetic texture

et al. 2013

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“…The latter contribution marks the difference with the quasi-free electron case recently studied in [14,15], where γ = σ B at µ = δµ. The discrepancy is simply due to the fact that, differently from the quasi-free electron case, in the system at hand we have conduction even in the absence of net charge/spin density.…”

Section: Conductivities In the Normal Phasementioning

confidence: 79%

“…In this case, then, we recover the zero-momentum result in [14,15]. Actually, formula (6.24) is just a part of a set of more general relations among the various conductivities in the normal phase.…”

Section: Conductivities In the Normal Phasementioning

confidence: 86%

Unbalanced Holographic Superconductors and Spintronics.

Musso¹

2013

Proceedings of Proceedings of the Corfu Summer Institute 2012 — PoS(Corfu2012)

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We present a minimal holographic model for s-wave superconductivity with unbalanced Fermi mixtures, in 2 + 1 dimensions at strong coupling. The breaking of a U(1) A "charge" symmetry is driven by a non-trivial profile for a charged scalar field in a charged asymptotically AdS 4 black hole. The chemical potential imbalance is implemented by turning on the temporal component of a U(1) B "spin" field under which the scalar field is uncharged. We study the phase diagram of the model and comment on the eventual (non) occurrence of LOFF-like inhomogeneous superconducting phases. Moreover, we study "charge" and "spin" transport, implementing a holographic realization (and a generalization thereof to superconducting setups) of Mott's two-current model which provides the theoretical basis of modern spintronics. Finally we comment on possible string or M-theory embeddings of our model and its higher dimensional generalizations, within consistent Kaluza-Klein truncations and brane-anti brane setups.

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“…It has been pointed out that SMF is generally produced by the spin electric field [27][28][29][30][31];…”

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confidence: 99%

Stability of spinmotive force in perpendicularly magnetized nanowires under high magnetic fields

Yamane

Ieda

Maekawa

2012

Applied Physics Letters

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Spinmotive force induced by domain wall motion in perpendicularly magnetized nanowires is numerically demonstrated. We show that using nanowires with large magnetic anisotropy can lead to a high stability of spinmotive force under strong magnetic fields. We observe spinmotive force in the order of tens of µV in a multilayered Co/Ni nanowire and in the order of several hundred µV in a L10-ordered FePt nanowire; the latter is two orders of magnitude greater than that in permalloy nanowires reported previously. The narrow structure and low mobility of a domain wall under magnetic fields in perpendicularly magnetized nanowires permits downsizing of spinmotive force devices.The mutual interaction between spin current and magnetization is a key phenomenon in the field of spintronics [1]. Spin current induces magnetization dynamics, i.e., spin-transfer-torque [2][3][4][5], which has been extensively studied through current-induced domain wall (DW) motion, primarily in permalloy (NiFe) nanowires with in-plane magnetization [6][7][8][9][10]. Recently, it has been reported experimentally [11,12] and theoretically [13,14] that nanowires with perpendicular magnetic anisotropy (PMA) are more favorable for spin-transfer-torque devices because they exhibit DW motion at a lower threshold current. On the other hand, the same interaction mediates energy-transfer from magnetization into conduction electrons, i.e., spinmotive force (SMF) [15]. Like the spin-transfer-torque [16] and other spin-related electromotive forces [17,18], SMF offers a promising functionality for future spintronic devices; e.g., it can be used to read out magnetic information [19]. SMF has been primarily demonstrated in NiFe [20][21][22][23][24][25], and only few reports have demonstrated SMF in PMA materials [26]. However, the soft magnetic properties of NiFe could occasionally be a major disadvantage for an SMF demonstration; certain magnetization structures are easily disturbed by a strong magnetic field, leading to an increased instability in SMF signals. Therefore, SMF induced by DW motion in NiFe nanowires is limited to a few µV [20,25].In this paper, the SMF induced by DW motion in PMA nanowires is numerically investigated. The abovementioned problem in the NiFe nanowires is resolved by using PMA nanowires, which show rigid DW motion because of their high magnetic anisotropy. It has been shown that materials with the high PMA are effective in achieving a large SMF. We numerically observe SMF in the order of tens of µV in a multilayered Co/Ni nanowire and in the order of several hundred µV in a L1 0 -ordered FePt nanowire with the very large PMA. In addition, the narrow structure and low mobility of a DW in PMA nanowires are effective in downsizing of devices using SMF.Let us begin by assessing SMF induced by DW motion in NiFe nanowires. It has been pointed out that SMF is generally produced by the spin electric field[27-31];where m is the unit vector parallel to the direction of local magnetization of the ferromagnet, P is the average spin polarizatio...

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Spin and charge transport induced by gauge fields in a ferromagnet

Cited by 26 publications

References 53 publications

Spin torques due to diffusive spin current in magnetic texture

Spin torques due to diffusive spin current in magnetic texture

Unbalanced Holographic Superconductors and Spintronics.

Stability of spinmotive force in perpendicularly magnetized nanowires under high magnetic fields

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