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 Engineering Magnetic Domain-Wall Structure in Permalloy Nanowires

2015 ◽  
Vol 3 (3) ◽  
Author(s):  
M. J. Benitez ◽  
M. A. Basith ◽  
R. J. Lamb ◽  
D. McGrouther ◽  
S. McFadzean ◽  
...  
Keyword(s):  
Domain Wall ◽  
Magnetic Domain ◽  
Wall Structure ◽  
Magnetic Domain Wall ◽  
Domain Wall Structure

scholarly journals Novel Chiral Magnetic Domain Wall Structure inFe/Ni/Cu(001)Films

2013 ◽  
Vol 110 (17) ◽  
Author(s):  
G. Chen ◽  
J. Zhu ◽  
A. Quesada ◽  
J. Li ◽  
A. T. N’Diaye ◽  
...  
Keyword(s):  
Domain Wall ◽  
Magnetic Domain ◽  
Wall Structure ◽  
Magnetic Domain Wall ◽  
Domain Wall Structure

Micromagnetic Simulation of Magnetic Structure in an Exchange-Coupled Trilayer

2014 ◽  
Vol 521 ◽  
pp. 543-546
Author(s):  
Zi Jun Wang ◽  
Tian Fu Li ◽  
Hong Wen Xiao ◽  
Yun Tao Liu ◽  
Xing Qiao Ma
Keyword(s):  
Domain Wall ◽  
Magnetic Moments ◽  
Magnetic Domain ◽  
Micromagnetic Simulation ◽  
Wall Structure ◽  
Magnetic Domain Wall ◽  
Exchange Spring ◽  
Ferromagnetic Exchange ◽  
Soft Ferromagnetic ◽  
Domain Wall Structure

The reversal process of an exchange spring trilayer was studied by micromagnetic simulation, simulating the hysteresis loop and magnetic domain wall structure of a soft/hard/soft ferromagnetic exchange spring. The exchange spring effect was observed, determining the chirality of its spiral magnetization configuration. By simulation of the domain wall structure, we find that reversal nucleation emerge simultaneously in either surface of two soft layers and the magnetic moments of hard layer start rotation at reversible stage.

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.

Atomic Structure of the Domain Walls of the Discommensurate Phases in Ge(111)/Ga

1998 ◽  
Vol 05 (01) ◽  
pp. 175-179 ◽  
Author(s):  
Zheng Gai ◽  
Bo Gao ◽  
Hang Ji ◽  
R. G. Zhao ◽  
W. S. Yang
Keyword(s):  
Domain Wall ◽  
Scanning Tunneling Microscopy ◽  
Atomic Structure ◽  
Domain Walls ◽  
Scanning Tunneling ◽  
Wall Structure ◽  
Tunneling Microscopy ◽  
Domain Wall Structure ◽  
Stm Images

We have studied the γ and β discommensurate phases of the Ge(111)/Ga system with scanning tunneling microscopy (STM). On the basis of the features of these phases known from our STM images as well as from previous papers, models of domain-wall structure of both phases have been proposed for further investigations.

Domain Structure Reversible Reconstruction of Amorphous Ferromagnetic by Water Molecules Weak Adsorption

2009 ◽  
Vol 152-153 ◽  
pp. 428-430 ◽  
Author(s):  
V.E. Zubov ◽  
A.D. Kudakov ◽  
N.L. Levshin ◽  
N.A. Mezenkov
Keyword(s):  
Domain Wall ◽  
Domain Structure ◽  
Domain Walls ◽  
Sample Surface ◽  
Wall Structure ◽  
Water Molecules ◽  
Wall Width ◽  
Influence Of Water ◽  
Weak Adsorption ◽  
Domain Wall Structure

Influence of water molecules reversible adsorption on domain structure and domain wall structure in amorphous Fe-rich ferromagnet samples is investigated by magnetooptical method. Before investigation the samples were kept in the air. Domain structure of the samples significantly changes in wacuum: instead one 180-degree domain wall several domain walls appear which are oriented with angle 45o to the long side of the sample. This effect is completely reversible. Another new effect is found: domain wall width on the sample surface in vacuum is 35% bigger (13.5 µm) than in atmosphere of water vapor (10 µm).

Magnetic domain-wall induced ferroelectric polarization in rare-earth orthoferrites AFeO3 (A = Lu, Y, Gd): first-principles calculations

2019 ◽  
Vol 7 (32) ◽  
pp. 10059-10065 ◽  
Author(s):  
Wenxuan Wang ◽  
Wei Sun ◽  
Guangbiao Zhang ◽  
Zhenxiang Cheng ◽  
Yuanxu Wang
Keyword(s):  
Rare Earth ◽  
First Principles ◽  
Ionic Radius ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Ferroelectric Polarization ◽  
First Principles Calculations ◽  
Magnetic Domain Wall ◽  
Magnetic Domain Walls ◽  
A Site

The spin-induced ferroelectric polarization at magnetic domain walls is dependent on the A-site ionic radius of AFeO3.

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