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.

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.

FIRST-PRINCIPLES CALCULATIONS OF CURRENT-INDUCED SPIN-TRANSFER TORQUES IN MAGNETIC DOMAIN WALLS

2013 ◽  
Vol 27 (12) ◽  
pp. 1350092 ◽  
Author(s):  
LING TANG ◽  
ZHIJUN XU ◽  
ZEJIN YANG
Keyword(s):  
First Principles ◽  
Domain Walls ◽  
Order Term ◽  
Tight Binding ◽  
Magnetic Domain ◽  
Spin Transfer ◽  
Third Order ◽  
First Order ◽  
Local Spin ◽  
Magnetic Domain Walls

Current-induced spin-transfer torques (STTs) have been studied in Fe , Co and Ni domain walls (DWs) by the method based on the first-principles noncollinear calculations of scattering wavefunctions expanded in the tight-binding linearized muffin-tin orbital (TB-LMTO) basis. The results show that the out-of-plane component of nonadiabatic STT in Fe DW has localized form, which is in contrast to the typical nonlocal oscillating nonadiabatic torques obtained in Co and Ni DWs. Meanwhile, the degree of nonadiabaticity in STT is also much greater for Fe DW. Further, our results demonstrate that compared to the well-known first-order nonadiabatic STT, the torque in the third-order spatial derivative of local spin can better describe the distribution of localized nonadiabatic STT in Fe DW. The dynamics of local spin driven by this third-order torques in Fe DW have been investigated by the Landau–Lifshitz–Gilbert (LLG) equation. The calculated results show that with the same amplitude of STTs the DW velocity induced by this third-order term is about half of the wall speed for the case of the first-order nonadiabatic STT.

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.

Spin Flexoelectricity and New Aspects of Micromagnetism

2010 ◽  
Vol 67 ◽  
pp. 149-157 ◽  
Author(s):  
Alexander P. Pyatakov ◽  
Anatoly K. Zvezdin ◽  
D.A. Sechin ◽  
A.S. Sergeev ◽  
E.P. Nikolaeva ◽  
...  
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Domain Wall Motion ◽  
Electric Polarization ◽  
Magnetic Media ◽  
Magnetic Domain Wall ◽  
Magnetic Vortices ◽  
Electrical Control ◽  
Magnetic Domain Walls ◽  
Physical Phenomena

The coupling between the strain gradient and electric polarization is known as flexoelectricity in dielectrics materials. In case of magnetic media it takes the form of electric polarization induced by spin modulation and vice versa. This spin flexoelectricity causes new physical phenomena of micromagnetism such as electric field driven magnetic domain wall motion and electrical control of magnetic vortices in magnets as well as clamping of the magnetic domain walls at the ferroelectric ones in multiferroics.

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

Magnetic structure and bonding of rare-earth diboride compounds R B2 : First-principles calculations

2012 ◽  
Vol 249 (7) ◽  
pp. 1470-1476 ◽  
Author(s):  
S. Kacimi ◽  
B. Bekkouche ◽  
A. Boukortt ◽  
F. Zazoua ◽  
M. Djermouni ◽  
...  
Keyword(s):  
Rare Earth ◽  
Magnetic Structure ◽  
First Principles ◽  
First Principles Calculations ◽  
Structure And Bonding
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