Tunable inertia of chiral magnetic domain walls

Torrejón, Jacob; Martínez, Eduardo; Hayashi, Masamitsu

doi:10.1038/ncomms13533

Cited by 33 publications

(56 citation statements)

References 47 publications

(116 reference statements)

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“…103,104,110 Unfortunately, the¯lms studied here are susceptible to current induced nucleation of domain walls which makes it di±cult to observe the velocity saturation at large current. We have therefore used the relationship 27,28 of velocity versus in-plane external¯eld directed along the current°o w (H X Þ measured at moderate current density to study D as a function of t F .…”

Section: The Interface Dzyaloshinskii-moriya Interactionmentioning

confidence: 99%

Spin–Orbit Effects in CoFeB/MgO Heterostructures with Heavy Metal Underlayers

Torrejón

Kim

Sinha

et al. 2016

SPIN

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We study e®ects originating from the strong spin-orbit coupling in CoFeB/MgO heterostructures with heavy metal (HM) underlayers. The perpendicular magnetic anisotropy at the CoFeB/MgO interface, the spin Hall angle of the heavy metal layer, current induced torques and the Dzyaloshinskii-Moriya interaction at the HM/CoFeB interfaces are studied for¯lms in which the early 5d transition metals are used as the HM underlayer. We show how the choice of the HM layer in°uences these intricate spin-orbit e®ects that emerge within the bulk and at interfaces of the heterostructures.

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Section: The Interface Dzyaloshinskii-moriya Interactionmentioning

confidence: 99%

Spin–Orbit Effects in CoFeB/MgO Heterostructures with Heavy Metal Underlayers

Torrejón

Kim

Sinha

et al. 2016

SPIN

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“…However, the spin orbit torque (SOT) due to the SHE itself promotes the progressive misalignment of both magnetization and current: as increases, the angle Φ asymptotically tends to 90 0 (see "DW angle vs " graph in Fig. 3(b)), leading to the abovementioned decrease of the slope of the DW speed dependence on current amplitude 18,19 .…”

Section: 1a Current-driven Dw Motion In the Absence Of Longitudinamentioning

confidence: 99%

“…Vogel et al 33 shown that the DW motion induced by nanosecond current pulses in Pt/Co/AlOx multilayers with perpendicular magnetic anisotropy exhibits negligible inertia. More recent studies by Torrejon et al 19 have shown that inertia effects result in a DW motion even when the current is switched off in high PMA systems with low damping. Our aim here is just to evaluate the inertia in HM/LFM/Spacer/UFM stacks, with FM ( > 0) and AF ( < 0) coupling, and to compare this "after-effect" to the single-FM-layer stack.…”

Section: 1c Inertia Effect On the Current-driven Dw Motionmentioning

confidence: 99%

“…Eq. (7) indicates that DW terminal velocity for a single-FM-layer monotonously increases with , but with a decreasing slope as the absolute current is increased 9,18,19 . This fact can be explained by the relative orientation of the magnetization within the DWs (⃗⃗⃗ or Φ with : , ) and the direction of the electric current flow ( ⃗ ( ) = ( )⃗⃗ ).…”

Section: 1a Current-driven Dw Motion In the Absence Of Longitudinamentioning

confidence: 99%

“…Although other ways to account for imperfection could be adopted, we selected this one based on previous studies, which properly describe other experimental observations 19 .…”

Section: ⃗⃗⃗( ⃗ ) ≡ ⃗⃗⃗ ( ⃗ ) = ⃗⃗⃗ ( ⃗ )/mentioning

confidence: 99%

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Current-driven domain wall dynamics in ferromagnetic layers synthetically exchange-coupled by a spacer: A micromagnetic study

Alejos

Raposo

Sánchez-Tejerina

et al. 2018

Journal of Applied Physics

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The current-driven domain wall motion along two exchange-coupled ferromagnetic layers with perpendicular anisotropy is studied by means of micromagnetic simulations and compared to the conventional case of a single ferromagnetic layer. Our results, where only the lower ferromagnetic layer is subjected to the interfacial Dzyaloshinskii-Moriya interaction and to the spin Hall effect, indicate that the domain walls can be synchronously driven in the presence of a strong interlayer exchange coupling, and that the velocity is significantly enhanced due to the antiferromagnetic exchange coupling as compared with the single-layer case. On the contrary, when the coupling is of ferromagnetic nature, the velocity is reduced. We provide a full micromagnetic characterization of the current-driven motion in these multilayers, both in the absence and in the presence of longitudinal fields, and the results are explained based on a one-dimensional model. The interfacial DzyaloshinskiiMoriya interaction, only necessary in this lower layer, gives the required chirality to the magnetization textures, while the interlayer exchange coupling favors the synchronous movement of the coupled walls by a dragging mechanism, without significant tilting of the domain wall plane. Finally, the domain wall dynamics along curved strips is also evaluated.These results indicate that the antiferromagnetic coupling between the ferromagnetic layers mitigates the tilting of the walls, which suggest these systems to achieve efficient and highlypacked displacement of trains of walls for spintronics devices. A study, taking into account defects and thermal fluctuations, allows to analyze the validity range of these claims.2

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Domain Wall Motion in Magnetic Nanostrips

Alejos

Raposo

Martínez

2020

Materials Science and Technology

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Domain walls are the transition regions between two magnetic domains. These objects have been very relevant during the last decade, not only due to their intrinsic interest in the development of novel spintronics devices but also because of their fundamental interest. The study of domain wall has been linked to the research on novel spin-orbit coupling phenomena such as the Dzyaloshinskii-Moriya interaction and the spin Hall effect amount others. Domain walls can be nucleated in ferromagnetic nanostrips and can be driven by conventional magnetic fields and spin currents due to the injection of electrical pulses, which make them very promising for technological applications of recording and logic devices. In this review, based on full micromagnetic simulations supported by extended one-dimensional models, we describe the static and dynamic properties of domain walls in thin ferromagnetic and ferrimagnetic wires with perpendicular magnetic anisotropy. The present chapter aims to provide a fundamental theoretical description of the fundaments of domain walls, and the numerical tools and models which allow describing the DW dynamics in previous and future experimental setups.

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Tunable inertia of chiral magnetic domain walls

Cited by 33 publications

References 47 publications

Spin–Orbit Effects in CoFeB/MgO Heterostructures with Heavy Metal Underlayers

Spin–Orbit Effects in CoFeB/MgO Heterostructures with Heavy Metal Underlayers

Current-driven domain wall dynamics in ferromagnetic layers synthetically exchange-coupled by a spacer: A micromagnetic study

Domain Wall Motion in Magnetic Nanostrips

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