Domain-wall step motors: Controlling the motion of magnetic domain walls using patterned magnetic films

2006 ◽  
Vol 74 (2) ◽  
Author(s):  
Sergey Savel’ev ◽  
A. L. Rakhmanov ◽  
Franco Nori
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Magnetic Films ◽  
Magnetic Domain Walls

scholarly journals Effective pinning energy landscape perturbations for propagating magnetic domain walls

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
D. M. Burn ◽  
D. Atkinson
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Energy Landscape ◽  
Magnetic Domain ◽  
Wall Structure ◽  
Magnetic Domain Wall ◽  
Magnetic Domain Walls ◽  
Periodic Behaviour ◽  
Domain Wall Structure ◽  
Magnetization Processes

Abstract The interaction between a magnetic domain wall and a pinning site is explored in a planar nanowire using micromagnetics to reveal perturbations of the pinning energetics for propagating domain walls. Numerical simulations in the high damping ’quasi-static’ and low damping ’dynamic’ regimes are compared and show clear differences in de-pinning fields, indicating that dynamical micromagnetic models, which incorporate precessionally limited magnetization processes, are needed to understand domain wall pinning. Differences in the micromagnetic domain wall structure strongly influence the pinning and show periodic behaviour with increasing applied field associated with Walker breakdown. In the propagating regime pinning is complicated.

scholarly journals Impedance Profile of a HFC-Type Magnetic Field Sensor with Inclined Magnetic Domain Walls, and Method of Controlling the Domain Wall Angle

2003 ◽  
Vol 27 (7) ◽  
pp. 832-838 ◽  
Author(s):  
T. Nakai ◽  
H. Abe ◽  
S. Yabukami ◽  
M. Yamaguchi ◽  
K.I. Arai
Keyword(s):  
Magnetic Field ◽  
Domain Wall ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Magnetic Field Sensor ◽  
Wall Angle ◽  
Magnetic Domain Walls ◽  
Field Sensor ◽  
Impedance Profile

Magnetic domain wall movement in iron silicon

1993 ◽  
Vol 51 ◽  
pp. 1044-1045
Author(s):  
J.E. Wittig
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Magnetic Domain Wall ◽  
Silicon Alloys ◽  
Iron Silicon ◽  
Domain Wall Movement ◽  
Wall Movement ◽  
Magnetic Domain Walls

Lorentz microscopy in the transmission electron microscope directly images magnetic domains. By changing the magnetic field of the electromagnetic lenses relative to the specimen plane, the movement of the magnetic domain walls and their interaction with microstructural features can be observed in situ. This type of experiment has successfully analyzed the microstructure-domain wall interactions in spinel ferrites and iron-rare-earth-boron magnetic materials. The domain wall motion reveals the qualitative pinning potential of grain boundaries, precipitates, inclusions, stacking faults, and cracks. In addition, these in situ experiments display the dynamics of magnetic domain nucleation. The current study investigates the magnetic domain wall movement in iron silicon alloys. Since magnetic properties such as intrinsic coercivity and permeability are structure sensitive, the influence of microstructure on domain wall movement dictates the soft magnetic behavior.Thin foils of iron-6.5 wt% silicon were prepared by electropolishing ribbons produced by melt spinning techniques. The magnetic domain walls were imaged in the defocused (Fresnel) mode with a Philips CM20T operated at 200 kV.

Magnetic Domain Walls in Nanowires

MRS Bulletin ◽  
2006 ◽  
Vol 31 (5) ◽  
pp. 395-399 ◽  
Author(s):  
Rolf Allenspach ◽  
Pierre-Olivier Jubert
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Electrical Current ◽  
Spin Transfer ◽  
Wall Structure ◽  
Conduction Electrons ◽  
Magnetic Domain Walls ◽  
Complex Spin ◽  
Small Elements

AbstractFor many decades, it was assumed that the characteristics of magnetic domain walls were determined by material properties and the walls were moved by magnetic fields.In the past few years, it has been shown that domain walls behave differently on the nanometer scale.Domain walls in small elements exhibit complex spin arrangements that strongly deviate from the wall types commonly encountered in magnetic thin-film systems, and they can be modified by changing the geometry of the element.Domain walls in nanowires can also be moved by injecting electrical current pulses.Whereas wall propagation is qualitatively explained by a spin transfer from the conduction electrons to the spins of the domain wall, important aspects of the observations cannot be explained by present models.Examples include the observation of a drastic transformation of the wall structure upon current injection and domain wall velocities that tend to be orders of magnitude smaller than anticipated from theory.

scholarly journals High-speed domain wall racetracks in a magnetic insulator

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Saül Vélez ◽  
Jakob Schaab ◽  
Martin S. Wörnle ◽  
Marvin Müller ◽  
Elzbieta Gradauskaite ◽  
...  
Keyword(s):  
Domain Wall ◽  
High Speed ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Nitrogen Vacancy ◽  
Electrical Currents ◽  
Magnetic Insulators ◽  
Magnetic Domain Walls ◽  
Current Threshold ◽  
Current Lines

Abstract Recent reports of current-induced switching of ferrimagnetic oxides coupled to heavy metals have opened prospects for implementing magnetic insulators into electrically addressable devices. However, the configuration and dynamics of magnetic domain walls driven by electrical currents in insulating oxides remain unexplored. Here we investigate the internal structure of the domain walls in Tm3Fe5O12 (TmIG) and TmIG/Pt bilayers, and demonstrate their efficient manipulation by spin–orbit torques with velocities of up to 400 ms−1 and minimal current threshold for domain wall flow of 5 × 106 A cm−2. Domain wall racetracks are defined by Pt current lines on continuous TmIG films, which allows for patterning the magnetic landscape of TmIG in a fast and reversible way. Scanning nitrogen-vacancy magnetometry reveals that the domain walls of TmIG thin films grown on Gd3Sc2Ga3O12 exhibit left-handed Néel chirality, changing to an intermediate Néel–Bloch configuration upon Pt deposition. These results indicate the presence of interfacial Dzyaloshinskii–Moriya interaction in magnetic garnets, opening the possibility to stabilize chiral spin textures in centrosymmetric magnetic insulators.

scholarly journals Optimized Voltage-Induced Control of Magnetic Domain-Wall Propagation in Hybrid Piezoelectric/Magnetostrictive Devices

Actuators ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 134
Author(s):  
Giancarlo Consolo ◽  
Giovanna Valenti
Keyword(s):  
Domain Wall ◽  
Electric Field ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Major Axis ◽  
Magnetic Domain Walls ◽  
Tightly Coupled ◽  
Dynamical Regimes ◽  
Crystal Class ◽  
Domain Wall Propagation

A theory of voltage-induced control of magnetic domain walls propagating along the major axis of a magnetostrictive nanostrip, tightly coupled with a ceramic piezoelectric, is developed in the framework of the Landau–Lifshitz–Gilbert equation. It is assumed that the strains undergone by the piezoelectric actuator, subject to an electric field generated by a dc bias voltage applied through a couple of lateral electrodes, are fully transferred to the magnetostrictive layer. Taking into account these piezo-induced strains and considering a magnetostrictive linear elastic material belonging to the cubic crystal class, the magnetoelastic field is analytically determined. Therefore, by using the classical traveling-wave formalism, the explicit expressions of the most important features characterizing the two dynamical regimes of domain-wall propagation have been deduced, and their dependence on the electric field strength has been highlighted. Moreover, some strategies to optimize such a voltage-induced control, based on the choice of the ceramic piezoelectric material and the orientation of dielectric poling and electric field with respect to the reference axes, have been proposed.

scholarly journals Magnetic Domain Walls Moving in Curved Permalloy Nanowires under Continuous and Pulsed Fields

2021 ◽  
Vol 31 (3) ◽  
Author(s):  
Quang Duc Hoang ◽  
Huu Xuan Cao ◽  
Thuong Hoai Nguyen ◽  
Ai Vinh Dao
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Dynamic Properties ◽  
Magnetic Domain ◽  
Logic Gates ◽  
The Other ◽  
Potential Well ◽  
Magnetic Domain Walls ◽  
Local Defects ◽  
Pulsed Fields

Magnetic domain walls created and propagated in curved permally nanowires under continuous and pulsed fields in a Lorentz microscope. Using such nanowires aims to create a single or multiple magnetic domain walls in typical areas of those structures, an external magnetic field then applies along the long axis of these nanowires. Following that the created domain walls are propagated from one end to the other end of each wire by increasing the continuous/pulsed field strength. At each increased field value, a Fresnel image is recorded. The obtained results show that the characteristics of those created and propagated domain walls are dependent on various parameters, i.e. connecting structures, wall types and chiralities. Corners between the straight and linking sections of those curved nanowires also play a crucial role along witth the local defects created in these wire-edges and surfaces where a point-defect is considered as a potential well that could pin/distort those created/propagated domain walls. By the aid of this observations, the dynamic properties of domain walls with the creating and propagating processes in those curved nanowires are exposed. These outcomes are vital to design novel domain wall trap structures supporting reproducible domain wall motions. That are of interest in providing a better understanding of multiple bits moving in the furure 3D racetrack memory, logic gates, shift register and other spintronic/computing devices.

The direct determination of magnetic domain wall profiles using a split detector STEM

1978 ◽  
Vol 36 (1) ◽  
pp. 466-467
Author(s):  
J.N. Chapman ◽  
P.E. Batson ◽  
E.M. Waddell ◽  
R.P. Ferrier
Keyword(s):  
Electron Microscope ◽  
Domain Wall ◽  
Transmission Electron Microscope ◽  
Domain Walls ◽  
Photographic Plate ◽  
Magnetic Domain ◽  
Direct Determination ◽  
Quantitative Information ◽  
Scanning Transmission Electron Microscope ◽  
Transmission Electron

By far the most commonly used mode of Lorentz microscopy in the examination of ferromagnetic thin films is the Fresnel or defocus mode. Use of this mode in the conventional transmission electron microscope (CTEM) is straightforward and immediately reveals the existence of all domain walls present. However, if such quantitative information as the domain wall profile is required, the technique suffers from several disadvantages. These include the inability to directly observe fine image detail on the viewing screen because of the stringent illumination coherence requirements, the difficulty of accurately translating part of a photographic plate into quantitative electron intensity data, and, perhaps most severe, the difficulty of interpreting this data. One solution to the first-named problem is to use a CTEM equipped with a field emission gun (FEG) (Inoue, Harada and Yamamoto 1977) whilst a second is to use the equivalent mode of image formation in a scanning transmission electron microscope (STEM) (Chapman, Batson, Waddell, Ferrier and Craven 1977), a technique which largely overcomes the second-named problem as well.

INFLUENCE OF THE DISLOCATION STRUCTURES ON THE BEHAVIOUR OF MAGNETIC DOMAIN WALLS IN HIGH PURITY IRON

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-627-C5-632 ◽  
Author(s):  
B. Astie ◽  
J. Degauque
Keyword(s):  
High Purity ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Magnetic Domain Walls ◽  
Purity Iron ◽  
High Purity Iron

scholarly journals Phase shifter based on voltage-controlled magnetic domain walls

AIP Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 075225
Author(s):  
Xiao Zhang ◽  
Chen Zhang ◽  
Chonglei Sun ◽  
Xiao Xu ◽  
Liuge Du ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Magnetic Domain Walls
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