Chirality control via double vortices in asymmetric Co dots

Dumas, Randy K.; Gilbert, Dustin A.; Eibagi, Nasim; Liu, Kai

doi:10.1103/physrevb.83.060415

Cited by 35 publications

(30 citation statements)

References 27 publications

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“…Our result is unexpected and intriguing because only c has been considered controllable in asymmetric disks. [24][25][26][27][28] Simultaneous control of c and p is thought to be related to the asymmetric nature in the formation process of vortex states, as reported in our previous work. 7 It was found that two different vortex state groups with cp = +1 and Simultaneous control of magnetic topologies M-Y Im et al cp = − 1 are not energetically equivalent in a single circular disk due to both intrinsic and extrinsic factors.…”

Section: Simultaneous Control Of Magnetic Topologies M-y Im Et Almentioning

confidence: 74%

“…Thus far, both static and dynamic studies on the control of vortex structures have been primarily dedicated to manipulation of either the c or p alone. 8,[21][22][23][24][25][26][27][28][29][30][31] A few attempts have been made to control both c and p, but these attempts have been conducted without repetition, meaning that only a single event of control has been investigated. 32,33 Therefore, reliability and repeatability for control of both topological features has not yet been addressed.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous control of magnetic topologies for reconfigurable vortex arrays

Fischer

Han

et al. 2017

NPG Asia Mater

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The topological spin textures in magnetic vortices in confined magnetic elements offer a platform for understanding the fundamental physics of nanoscale spin behavior and the potential of harnessing their unique spin structures for advanced magnetic technologies. For magnetic vortices to be practical, an effective reconfigurability of the two topologies of magnetic vortices, that is, the circularity and the polarity, is an essential prerequisite. The reconfiguration issue is highly relevant to the question of whether both circularity and polarity are reliably and efficiently controllable. In this work, we report the first direct observation of simultaneous control of both circularity and polarity by the sole application of an in-plane magnetic field to arrays of asymmetrically shaped permalloy disks. Our investigation demonstrates that a high degree of reliability for control of both topologies can be achieved by tailoring the geometry of the disk arrays. We also propose a new approach to control the vortex structures by manipulating the effect of the stray field on the dynamics of vortex creation. The current study is expected to facilitate complete and effective reconfiguration of magnetic vortex structures, thereby enhancing the prospects for technological applications of magnetic vortices.

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Section: Simultaneous Control Of Magnetic Topologies M-y Im Et Almentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Simultaneous control of magnetic topologies for reconfigurable vortex arrays

Fischer

Han

et al. 2017

NPG Asia Mater

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show abstract

“…18,20 In this in-plane magnetization configuration, the restricted nanostructure geometry allows for a good control of topological defect nucleation and propagation processes. [16][17][18][19][20] An ideal system to combine these two concepts of topological defects can be found in weak PMA materials in which stripe domains coexist with a significant in-plane magnetization component. When perpendicular magnetic anisotropy K N becomes smaller than magnetostatic energy (E demag = 2πM 2 s with M s the saturation magnetization), weak stripe domains are nucleated in the system 21 above a critical thickness.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19] Fractional vortices near sample edges allow us to understand many different situations such as holes within a continuous magnetic layer, 17 vortices in nanodots, 19 or domain wall propagation in magnetic nanowires. 18,20 In this in-plane magnetization configuration, the restricted nanostructure geometry allows for a good control of topological defect nucleation and propagation processes.…”

Section: Introductionmentioning

confidence: 99%

Controlled nucleation of topological defects in the stripe domain patterns of lateral multilayers with perpendicular magnetic anisotropy

et al. 2013

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Magnetic lateral multilayers have been fabricated on weak perpendicular magnetic anisotropy amorphous Nd-Co films in order to perform a systematic study on the conditions for controlled nucleation of topological defects within their magnetic stripe domain pattern. A lateral thickness modulation of period w is defined on the nanostructured samples that, in turn, induces a lateral modulation of both magnetic stripe domain periods λ and average in-plane magnetization component M in-plane . Depending on lateral multilayer period and in-plane applied field, thin and thick regions switch independently during in-plane magnetization reversal and domain walls are created within the in-plane magnetization configuration coupled to variable angle grain boundaries and disclinations within the magnetic stripe domain patterns. This process is mainly driven by the competition between rotatable anisotropy (that couples the magnetic stripe pattern to in-plane magnetization) and in-plane shape anisotropy induced by the periodic thickness modulation. However, as the structural period w becomes comparable to magnetic stripe period λ, the nucleation of topological defects at the interfaces between thin and thick regions is hindered by a size effect and stripe domains in the different thickness regions become strongly coupled.

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“…A-priori, one would assume that only one type of circularity in asymmetrically shaped disks would be reliably selected as long as the direction of external fields for saturating and releasing the disks is fixed [30][31][32][33] . However, our results show that the final outcome of circularity depends on minute details of the dynamics in the initial stage of the formation process.…”

mentioning

confidence: 99%

Stochastic formation of magnetic vortex structures in asymmetric disks triggered by chaotic dynamics

Lee

Vogel

et al. 2014

Nat Commun

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The non-trivial spin configuration in a magnetic vortex is a prototype for fundamental studies of nanoscale spin behaviour with potential applications in magnetic information technologies. Arrays of magnetic vortices interfacing with perpendicular thin films have recently been proposed as enabler for skyrmionic structures at room temperature, which has opened exciting perspectives on practical applications of skyrmions. An important milestone for achieving not only such skyrmion materials but also general applications of magnetic vortices is a reliable control of vortex structures. However, controlling magnetic processes is hampered by stochastic behaviour, which is associated with thermal fluctuations in general. Here we show that the dynamics in the initial stages of vortex formation on an ultrafast timescale plays a dominating role for the stochastic behaviour observed at steady state. Our results show that the intrinsic stochastic nature of vortex creation can be controlled by adjusting the interdisk distance in asymmetric disk arrays.

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Chirality control via double vortices in asymmetric Co dots

Cited by 35 publications

References 27 publications

Simultaneous control of magnetic topologies for reconfigurable vortex arrays

Simultaneous control of magnetic topologies for reconfigurable vortex arrays

Controlled nucleation of topological defects in the stripe domain patterns of lateral multilayers with perpendicular magnetic anisotropy

Stochastic formation of magnetic vortex structures in asymmetric disks triggered by chaotic dynamics

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