Article
Currentdriven vortex domain wall dynamics by micromagnetic simulations
Physical review. B, Condensed matter (Impact Factor: 3.66). 05/2006; 73(18). DOI: 10.1103/PhysRevB.73.184408
Source: arXiv

Article: Dynamic transformations of the internal structure of a moving domain wall in magnetic nanostripes
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ABSTRACT: The magnetic field (or electric current) driven domainwall motion in magnetic nanostripes is of considerable interest because it is essential to the performance of informationstorage and logic devices. One of the current key problems is to understand the complex behaviors of oscillatory domainwall motions under applied magnetic fields stronger than the socalled Walker field, beyond which the velocity of domain walls markedly drops. In a certain range just above the Walker field, the motions are not chaotic but rather periodic with different periodicities of dynamic transformations of a moving domain wall between the different types of its internal structure. In addition, three different periodicities of the dynamic transformations are calculated, which consist of different types of domainwall structures that are transformed from one type to another. The transformation periods vary with the field strength and the nanostripe width. This phenomenon can be described by the dynamic motion of a limited number of magnetic topological solitons such as the vortex and antivortex confined in nanostripes. These results provide a considerably better understanding and details of the domainwall motions in soft magnetic nanostripes.Physical review. B, Condensed matter 11/2007; · 3.66 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The currentinduced motion of magnetic domain walls (DWs) confined to nanostructures is of great interest for fundamental studies as well as for technological applications in spintronic devices. Here, we present magnetic images showing the depinning properties of pulsecurrentdriven domain walls in wellshaped Permalloy nanowires obtained using photoemission electron microscopy combined with xray magnetic circular dichroism. In the vicinity of the threshold current density (Jth = 4.2 × 10(11) A.m(2)) for the DW motion, discontinuous DW depinning and motion have been observed as a sequence of "Barkhausen jumps". A onedimensional analytical model with a piecewise parabolic pinning potential has been introduced to reproduce the DW hopping between two nearest neighbour sites, which reveals the dynamical nature of the currentdriven DW motion in the depinning regime.Scientific Reports 01/2013; 3:3080. · 5.08 Impact Factor 
Article: Currentdriven springlike oscillatory motion of coupled vortex walls in a twonanostripe system
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ABSTRACT: In a two closely spaced nanostripes system, the coupled vortex wall undergoes a springlike oscillatory motion (SOM) when current is applied to both nanostripes in opposite directions. The SOM may vanish, when the current density is larger than a critical value. The critical current density for destroying the SOM decreases as the interstripe spacing increases. However, as the perpendicular anisotropy of the system increases, the critical current density firstly decreases and then increases. Two competitive effects of the perpendicular anisotropy on the SOM are shown. Moreover, diagrams of without oscillation, spring behavior and motionless phases upon the current and the interstripe spacing (or the perpendicular anisotropy) are given.EPL (Europhysics Letters) 09/2013; 103(6):67004. · 2.26 Impact Factor
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