scholarly journals Current-Driven Domain Wall Motion in Curved Ferrimagnetic Strips Above and Below the Angular Momentum Compensation

2021 ◽  
Vol 9 ◽  
Author(s):  
D. Osuna Ruiz ◽  
O. Alejos ◽  
V. Raposo ◽  
E. Martínez
Keyword(s):  
Angular Momentum ◽  
Domain Wall ◽  
High Speed ◽  
Wall Motion ◽  
Domain Walls ◽  
Relaxation Times ◽  
Domain Wall Motion ◽  
Current Density Distribution ◽  
Terminal Velocity ◽  
Artificial System

Current driven domain wall motion in curved Heavy Metal/Ferrimagnetic/Oxide multilayer strips is investigated using systematic micromagnetic simulations which account for spin-orbit coupling phenomena. Domain wall velocity and characteristic relaxation times are studied as functions of the geometry, curvature and width of the strip, at and out of the angular momentum compensation. Results show that domain walls can propagate faster and without a significant distortion in such strips in contrast to their ferromagnetic counterparts. Using an artificial system based on a straight strip with an equivalent current density distribution, we can discern its influence on the wall terminal velocity, as part of a more general geometrical influence due to the curved shape. Curved and narrow ferrimagnetic strips are promising candidates for designing high speed and fast response spintronic circuitry based on current-driven domain wall motion.

Electrical Control of Magnetic Multi-Domain Transformation in a Specific Geometric-Patterned Ni Nanostructure on a Piezoelectric [Pb(Mg1/3Nb2/3)O3]0.68–[PbTiO3]0.32 Substrate

2016 ◽  
Author(s):  
Yu-Jen Chen ◽  
Tien-Kan Chung ◽  
Po-Jung Lin ◽  
Chiao-Fang Hung ◽  
Hou-Jen Chu ◽  
...  
Keyword(s):  
Domain Wall ◽  
Data Storage ◽  
Wall Motion ◽  
Domain Walls ◽  
Magnetoelectric Effect ◽  
Domain Wall Motion ◽  
Electrical Control ◽  
Domain State ◽  
Memory Applications ◽  
Domain Transformation

In this paper, we report an electrical control of magnetic multi-domain-walls transformation in an N-shape-patterned Ni nanostructures on a piezoelectric [Pb(Mg1/3Nb2/3)O3]0.68–[PbTiO3]0.32 substrate. Based on the converse-magnetoelectric-effect induced domain-wall transformation and the specific N-shape geometry guided domain-wall motion, the domain walls are successfully transformed by an applied electric field of 0.8 MV/m from the transverse domain wall state into the flux closure vortex domain state. These experimental results achieve the electrical control of multi-domain-walls transformation and would create more data storage and memory applications in the future.

High-speed Magnetic Memory based on Spin-Torque Domain Wall Motion

2009 ◽  
Author(s):  
N. Ishiwata ◽  
S. Fukami ◽  
T. Suzuki ◽  
K. Nagahara ◽  
N. Ohshima ◽  
...  
Keyword(s):  
Domain Wall ◽  
High Speed ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Magnetic Memory ◽  
Spin Torque

Magnetic dipole interactions in dysprosium ethyl sulphate III. Magnetic and thermal properties below the Curie point

1968 ◽  
Vol 306 (1486) ◽  
pp. 335-353 ◽  
Keyword(s):  
Domain Wall ◽  
Magnetic Dipole ◽  
Wall Motion ◽  
Domain Walls ◽  
Domain Wall Motion ◽  
Single Spin ◽  
Relaxation Effects ◽  
Dipole Interactions ◽  
Spin Interactions ◽  
Spin Reversal

The thermal and magnetic properties of dysprosium ethyl sulphate have been measured at temperatures below its Curie temperature of 0⋅13 °K. The ferromagnetism is shown to be due almost entirely to magnetic dipole interactions which are highly anisotropic corresponding to a zero magnetic g -value perpendicular to the c -axis. The system thus approximates closely to a ferromagnetic Ising model. Because of demagnetizing effects the low field proper­ties are dominated by the formation of domains, which are shown to be long and thin with unusually abrupt domain walls. Measurements of the initial susceptibility at frequencies between 25 and 900 c/s show marked relaxation effects which are interpreted in terms of both domain wall motion and single spin reversals. A discussion is given of the general problem of finding the real and imaginary susceptibility components in systems with strong dipolar interactions. In favourable cases, such as dysprosium ethyl sulphate, it is possible to find a shape-independent quasi-static susceptibility which corresponds to the response of the system in the absence of domain wall motion and demagnetizing effects. Values for the spin-reversal relaxation time are found to be of the order of tens of microseconds which is surprisingly short in view of the absence of non-diagonal terms in the spin-spin interactions.

Scalable Cell Technology Utilizing Domain Wall Motion for High-speed MRAM

2007 ◽  
Author(s):  
H. Numata ◽  
T. Suzuki ◽  
N. Ohshima ◽  
S. Fukami ◽  
K. Nagahara ◽  
...  
Keyword(s):  
Domain Wall ◽  
High Speed ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Cell Technology

scholarly journals Measurement of the tilt of a moving domain wall shows precession-free dynamics in compensated ferrimagnets

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
E. Haltz ◽  
J. Sampaio ◽  
S. Krishnia ◽  
L. Berges ◽  
R. Weil ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Domain Wall ◽  
Low Power ◽  
High Speed ◽  
Domain Walls ◽  
Spin Orbit ◽  
Spin Lattices ◽  
Moving Domain ◽  
Moving Domain Wall

Abstract One fundamental obstacle to efficient ferromagnetic spintronics is magnetic precession, which intrinsically limits the dynamics of magnetic textures. We experimentally demonstrate that this precession vanishes when the net angular momentum is compensated in domain walls driven by spin–orbit torque in a ferrimagnetic GdFeCo/Pt track. We use transverse in-plane fields to provide a robust and parameter-free measurement of the domain wall internal magnetisation angle, demonstrating that, at the angular compensation, the DW tilt is zero, and thus the magnetic precession that caused it is suppressed. Our results highlight the mechanism of faster and more efficient dynamics in materials with multiple spin lattices and vanishing net angular momentum, promising for high-speed, low-power spintronic applications.

scholarly journals Ionitronic manipulation of current-induced domain wall motion in synthetic antiferromagnets

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yicheng Guan ◽  
Xilin Zhou ◽  
Fan Li ◽  
Tianping Ma ◽  
See-Hun Yang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Domain Wall ◽  
Wall Motion ◽  
Domain Walls ◽  
Magnetic Moments ◽  
Magnetic Layer ◽  
Ferromagnetic Layer ◽  
Domain Wall Motion ◽  
Antiferromagnetic Coupling ◽  
Induced Motion

AbstractThe current induced motion of domain walls forms the basis of several advanced spintronic technologies. The most efficient domain wall motion is found in synthetic antiferromagnetic (SAF) structures that are composed of an upper and a lower ferromagnetic layer coupled antiferromagnetically via a thin ruthenium layer. The antiferromagnetic coupling gives rise to a giant exchange torque with which current moves domain walls at maximum velocities when the magnetic moments of the two layers are matched. Here we show that the velocity of domain walls in SAF nanowires can be reversibly tuned by several hundred m/s in a non-volatile manner by ionic liquid gating. Ionic liquid gating results in reversible changes in oxidation of the upper magnetic layer in the SAF over a wide gate-voltage window. This changes the delicate balance in the magnetic properties of the SAF and, thereby, results in large changes in the exchange coupling torque and the current-induced domain wall velocity. Furthermore, we demonstrate an example of an ionitronic-based spintronic switch as a component of a potential logic technology towards energy-efficient, all electrical, memory-in-logic.

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