scholarly journals Electronic transport through domain walls in ferromagnetic nanowires:  Coexistence of adiabatic and nonadiabatic spin dynamics

2004 ◽  
Vol 69 (1) ◽  
Author(s):  
Victor A. Gopar ◽  
Dietmar Weinmann ◽  
Rodolfo A. Jalabert ◽  
Robert L. Stamps
Keyword(s):  
Electronic Transport ◽  
Domain Walls ◽  
Spin Dynamics ◽  
Ferromagnetic Nanowires

scholarly journals Magnetisation Processes in Geometrically Frustrated Spin Networks with Self-Assembled Cliques

Entropy ◽  
2020 ◽  
Vol 22 (3) ◽  
pp. 336 ◽  
Author(s):  
Bosiljka Tadić ◽  
Miroslav Andjelković ◽  
Milovan Šuvakov ◽  
Geoff J. Rodgers
Keyword(s):  
Domain Walls ◽  
Spin Dynamics ◽  
Higher Order ◽  
Spin Networks ◽  
Graph Theoretic ◽  
Geometrically Frustrated ◽  
Geometric Frustration ◽  
Antiferromagnetic Materials ◽  
Geometrically Constrained ◽  
Ferromagnetic Interactions

Functional designs of nanostructured materials seek to exploit the potential of complex morphologies and disorder. In this context, the spin dynamics in disordered antiferromagnetic materials present a significant challenge due to induced geometric frustration. Here we analyse the processes of magnetisation reversal driven by an external field in generalised spin networks with higher-order connectivity and antiferromagnetic defects. Using the model in (Tadić et al. Arxiv:1912.02433), we grow nanonetworks with geometrically constrained self-assemblies of simplexes (cliques) of a given size n, and with probability p each simplex possesses a defect edge affecting its binding, leading to a tree-like pattern of defects. The Ising spins are attached to vertices and have ferromagnetic interactions, while antiferromagnetic couplings apply between pairs of spins along each defect edge. Thus, a defect edge induces n − 2 frustrated triangles per n-clique participating in a larger-scale complex. We determine several topological, entropic, and graph-theoretic measures to characterise the structures of these assemblies. Further, we show how the sizes of simplexes building the aggregates with a given pattern of defects affects the magnetisation curves, the length of the domain walls and the shape of the hysteresis loop. The hysteresis shows a sequence of plateaus of fractional magnetisation and multiscale fluctuations in the passage between them. For fully antiferromagnetic interactions, the loop splits into two parts only in mono-disperse assemblies of cliques consisting of an odd number of vertices n. At the same time, remnant magnetisation occurs when n is even, and in poly-disperse assemblies of cliques in the range n ∈ [ 2 , 10 ] . These results shed light on spin dynamics in complex nanomagnetic assemblies in which geometric frustration arises in the interplay of higher-order connectivity and antiferromagnetic interactions.

scholarly journals Magnetic imaging of the pinning mechanism of asymmetric transverse domain walls in ferromagnetic nanowires

2010 ◽  
Vol 97 (23) ◽  
pp. 233102 ◽  
Author(s):  
Dorothée Petit ◽  
Huang T. Zeng ◽  
Joao Sampaio ◽  
Emma Lewis ◽  
Liam O’Brien ◽  
...  
Keyword(s):  
Domain Walls ◽  
Pinning Mechanism ◽  
Ferromagnetic Nanowires ◽  
Magnetic Imaging

scholarly journals Packing 360∘ domain walls of identical circulation on planar ferromagnetic nanowires with notches using circular magnetic fields

AIP Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 056408 ◽  
Author(s):  
F. I. Kaya ◽  
A. Sarella ◽  
D. Wang ◽  
M. Tuominen ◽  
K. E. Aidala
Keyword(s):  
Magnetic Fields ◽  
Domain Walls ◽  
Ferromagnetic Nanowires

Detection of the static and kinetic pinning of domain walls in ferromagnetic nanowires

2009 ◽  
Vol 95 (15) ◽  
pp. 152506 ◽  
Author(s):  
Sung-Min Ahn ◽  
Kyoung-Woong Moon ◽  
Dong-Hyun Kim ◽  
Sug-Bong Choe
Keyword(s):  
Domain Walls ◽  
Ferromagnetic Nanowires ◽  
Pinning Of Domain Walls

scholarly journals Domain wall interactions at a cross-shaped vertex

2012 ◽  
Vol 370 (1981) ◽  
pp. 5794-5805 ◽  
Author(s):  
L. O'Brien ◽  
A. Beguivin ◽  
D. Petit ◽  
A. Fernandez-Pacheco ◽  
D. Read ◽  
...  
Keyword(s):  
Domain Wall ◽  
Complex Systems ◽  
Domain Walls ◽  
Complete Suppression ◽  
Ferromagnetic Nanowires ◽  
Attractive Case ◽  
Wall Interactions

The interaction of two domain walls (DWs) at a cross-shaped vertex fabricated from two ferromagnetic nanowires has been experimentally investigated. Both magnetostatically repulsive and attractive interactions have been probed. It is found that in the repulsive case, a passing DW may directly induce the depinning of another that is already pinned at a vertex. This effect can be qualitatively described by considering only simple, magnetostatic-charge-based arguments. In the attractive case, however, asymmetric pinning is found, with complete suppression of depinning possible. This observed effect is contrary to simple charge-based arguments and highlights the need for full micromagnetic characterization of the DW interactions in more complex systems.

scholarly journals Walker-like domain wall breakdown in layered antiferromagnets driven by staggered spin–orbit fields

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Rubén M. Otxoa ◽  
P. E. Roy ◽  
R. Rama-Eiroa ◽  
J. Godinho ◽  
K. Y. Guslienko ◽  
...  
Keyword(s):  
Domain Wall ◽  
Large Scale ◽  
Domain Walls ◽  
Spin Dynamics ◽  
Continuum Theory ◽  
Dynamical Regime ◽  
Spin Orbit ◽  
Translational Invariance ◽  
Domain Structures ◽  
Dynamics Simulations

Abstract Within linear continuum theory, no magnetic texture can propagate faster than the maximum group velocity of the spin waves. Here, by atomistic spin dynamics simulations and supported by analytical theory, we report that a strongly non-linear transient regime due to the appearance of additional magnetic textures results in the breaking of the Lorentz translational invariance. This dynamical regime is akin to domain wall Walker-breakdown in ferromagnets and involves the nucleation of an antiferromagnetic domain wall pair. While one of the nucleated domain walls is accelerated beyond the magnonic limit, the remaining pair remains static. Under large spin–orbit fields, a cascade of multiple generation and recombination of domain walls are obtained. This result may clarify recent experiments on current pulse induced shattering of large domain structures into small fragmented domains and the subsequent slow recreation of large-scale domains.

scholarly journals Stability of precessing domain walls in ferromagnetic nanowires

2011 ◽  
Vol 84 (10) ◽  
Author(s):  
Yan Gou ◽  
Arseni Goussev ◽  
J. M. Robbins ◽  
Valeriy Slastikov
Keyword(s):  
Domain Walls ◽  
Ferromagnetic Nanowires
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