Unidirectional Thermal Effects in Current-Induced Domain Wall Motion

Torrejón, Jacob; Malinowski, Grégory; Pelloux, M.; Weil, Raphaël; Thiaville, A.; Curiale, J.; Lacour, Daniel; Montaigne, F.; Hehn, M.

doi:10.1103/physrevlett.109.106601

Cited by 72 publications

(88 citation statements)

References 31 publications

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“…2 In recent years, the motion of single domain wall (DW) due to a spin transfer torque of electrons has been well studied theoretically [3][4][5][6] and experimentally. [7][8][9][10][11] For instance, it was known that the velocity of DW increases linearly with the increasing of the applied current, and when the applied current is higher than a critical value, a dramatic reduction in DW average velocity occurs due to Walker breakdown. [12][13][14] However, for the application of data storage, there must be multiple DWs in a magnetic nanostripe.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of multiple 360o domain wall structures and its current-driven motion in a magnetic nanostripe

Dong

Lei

et al. 2015

AIP Advances

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Dynamics of multiple transverse walls (TWs) in a magnetic nanostripe is studied by micromagnetic simulations. It shows that, when TWs are arranged in a stripe with same orientation, they will attract each other and finally annihilate. However, when adjacent TWs are arranged with opposite orientation, a metastable complex wall can be formed, e.g., two TWs lead to 360o wall. For three or more TWs, the formed complex wall includes a number of 360o substructures, which is called multiple 360o structure (M360S) here. The M360S itself may be used to store multiple logical data since each 360o substructure can act as logical ”0” or ”1”. On the other hand, the M360S may behave like single TW under an applied current, namely, the M360S can be driven steadily by current like that of single TW. A parity effect of the number of 360o substructures on the critical current for the annihilation is found. Namely, when the number is odd or even, the critical current increase or decrease with the increasing of the number, respectively. The parity effect is relevant to the out-of-plane magnetic moment of the M360S.

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Section: Introductionmentioning

confidence: 99%

Manipulation of multiple 360o domain wall structures and its current-driven motion in a magnetic nanostripe

Dong

Lei

et al. 2015

AIP Advances

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“…In fact, DMI changes the dispersion relation for magnons, Eqs. (10) and (11). The group velocities of the propagating and the reflected magnons turn differently.…”

Section: (A) For Example If D > 0 J Xmentioning

confidence: 99%

“…Of key interest is the influence of the DMI on the magnon dispersion relation, Eqs. (10) and (11). At the edges of the nanowire, the magnons are reflected by the boundaries.…”

Section: (A) For Example If D > 0 J Xmentioning

confidence: 99%

“…The thermally induced DW dynamics has been studied intensively in recent years [11][12][13][14][15]. The effect of applied thermal bias is twofold: (i) it generates the adiabatic thermomagnonic spin transfer torque driving DWs from the hot to the cold edge [16][17][18], and (ii) it forms the nonadiabatic thermomagnonic * levan.chotorlishvili@gmail.com torque, also known as entropic torque or dissipative torque.…”

Section: Introductionmentioning

confidence: 99%

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Thermally induced magnonic spin current, thermomagnonic torques, and domain-wall dynamics in the presence of Dzyaloshinskii-Moriya interaction

et al. 2016

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Thermally activated domain-wall (DW) motion in magnetic insulators has been considered theoretically, with a particular focus on the role of Dzyaloshinskii-Moriya interaction (DMI) and thermomagnonic torques. The thermally assisted DW motion is a consequence of the magnonic spin current due to the applied thermal bias. In addition to the exchange magnonic spin current and the exchange adiabatic and the entropic spin transfer torques, we also consider the DMI-induced magnonic spin current, thermomagnonic DMI fieldlike torque, and the DMI entropic torque. Analytical estimations are supported by numerical calculations. We found that the DMI has a substantial influence on the size and the geometry of DWs, and that the DWs become oriented parallel to the long axis of the nanostrip. Increasing the temperature smoothes the DWs. Moreover, the thermally induced magnonic current generates a torque on the DWs, which is responsible for their motion. From our analysis it follows that for a large enough DMI the influence of DMI-induced fieldlike torque is much stronger than that of the DMI and the exchange entropic torques. By manipulating the strength of the DMI constant, one can control the speed of the DW motion, and the direction of the DW motion can be switched, as well. We also found that DMI not only contributes to the total magnonic current, but also it modifies the exchange magnonic spin current, and this modification depends on the orientation of the steady-state magnetization. The observed phenomenon can be utilized in spin caloritronics devices, for example in the DMI based thermal diodes. By switching the magnetization direction, one can rectify the total magnonic spin current.

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“…However, the pinning sites of two DWs are random and the manipulation on one of the DWs pinned in the wire is impossible for the reason of weak pinning. Torrejon et al 13 have reported the single/multiple CIDWM under the effect of thermal gradient in curved Py nanowire and the same structure is also used to investigate the effects on two DWs propagation in Py strips with uniform and non-uniform cross section reported by Raposo. 14 However, the stable manipulation of DWM, especially single/multiple DW motions cannot be accomplished simply by thermal gradient along the wire or with sole strip structure.…”

Section: Introductionmentioning

confidence: 99%

Current-induced multiple domain wall motion modulated by magnetic pinning in zigzag shaped nanowires

et al. 2017

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Using micromagnetic simulation, we investigate the current-induced multiple domain wall motion (CIDWM) in zigzag nanowires with different bar angles (θ=90°, 120° and 150°). Two dynamic processes of single DWM and double DWM are found in different regimes of current density identified by two thresholds in all zigzag nanowires. The decreasing threshold current is found in the zigzag nanowires with increased bar angles, indicating the angular-dependence of the magnetic pinning. This work suggests a possibility of manipulating the single/multiple DWM in future DW devices by introducing the shape anisotropy.

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Unidirectional Thermal Effects in Current-Induced Domain Wall Motion

Cited by 72 publications

References 31 publications

Manipulation of multiple 360o domain wall structures and its current-driven motion in a magnetic nanostripe

Manipulation of multiple 360o domain wall structures and its current-driven motion in a magnetic nanostripe

Thermally induced magnonic spin current, thermomagnonic torques, and domain-wall dynamics in the presence of Dzyaloshinskii-Moriya interaction

Current-induced multiple domain wall motion modulated by magnetic pinning in zigzag shaped nanowires

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