Control of vortex chirality in a symmetric ferromagnetic ring using a ferromagnetic nanoelement

Makartsou, Uladzislau; Moalic, Mathieu; Zelent, Mateusz; Mruczkiewicz, M.; Krawczyk, Maciej

doi:10.1039/d3nr00582h

Cited by 1 publication

(2 citation statements)

References 39 publications

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“…More importantly, the vortex magnetization in the disc becomes more stable with less magnetostatic interaction by removing the core. Thus, it is easier to control and reproduce the switching process in the ring-type elements [14], which is interesting for many technological applications, including data storage devices, non-volatile magnetic random-access memories [15,16] and biosensors [17]. Interestingly, the ring-shaped magnetic element reduces the interaction with their neighbours when the vortexstate elements are arranged in a regular array, and that can allow the elements to be arranged compactly leading towards ultra-high-density data storage applications [18].…”

Section: Introductionmentioning

confidence: 99%

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Effect of void geometry and magnetic anisotropy in controlling the vortex in sub-micron annular Permalloy disc

Palabindela,

Sinha,

Behera

2024

Phys. Scr.

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Ferromagnetic rings, particularly asymmetric Permalloy (Py) rings are recognized as promising configurations for spintronic devices, offering additional degrees of freedom for manipulating magnetic states, especially in vortex configurations. Through micromagnetic simulations, our study explores the impact on magnetization states and spin configuration concerning ring symmetry, aligning with the interest in controlling vortex states for information storage. We initially obtained zero-field spin configurations by varying ring thickness (t), observing a 360° domain wall in rings with t < 12 nm and bi-vortex wall in rings with t ~ 36 nm during magnetization reversal. Notably, an extended stability of the global-vortex state was observed in rings with t > 36 nm, indicating the dominance of global-vortex nucleation in thick asymmetric rings during domain wall movement. We investigate the hysteresis loops and spin configurations by varying the in-plane and out-of-plane anisotropy values. Our findings reveal the presence of multiple vortex cores with different polarities and sense of rotations in the ring for the in-plane anisotropy ~ 30 to ~ 40 kJ/m3. Additionally, a global-vortex with two vortex cores was formed due to demagnetization energy. We analysed the energy profile of stable magnetization states for various t and anisotropy values. Interestingly, the shape of the hysteresis loop changes significantly for the disc containing different shapes of void. Circular and square-shaped geometries suggest that the bi-vortex state is a stable configuration during magnetization reversal in both cases. The study also indicates the stability of the vortex with a square-shaped void geometry up to a sufficiently large field. For the case of triangular-shaped voids, the global-vortex state was favored with even the small fields. The estimated spin canting angles are found to be correlated with the presence of vortex spin configurations. Overall, these results are important for the development of magnetization vortex-based spintronics devices.

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Section: Introductionmentioning

confidence: 99%

“…In-depth research on magnetic spin configurations and switching processes in ring structures has steadily received growing interest and yielded valuable insights [19][20][21][22][23][24]. In the symmetric disks or rings, it is seen in earlier studies that the sense of in-plane magnetization rotation and polarity cannot be tailored [25].…”

Section: Introductionmentioning

confidence: 99%

Effect of void geometry and magnetic anisotropy in controlling the vortex in sub-micron annular Permalloy disc

Palabindela,

Sinha,

Behera

2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

Control of vortex chirality in a symmetric ferromagnetic ring using a ferromagnetic nanoelement

Abstract: A ferromagnetic nanoelement placed asymmetrically inside a ferromagnetic nanoring controls the chirality of the magnetization vortex state in remanence.

Cited by 1 publication

References 39 publications

Effect of void geometry and magnetic anisotropy in controlling the vortex in sub-micron annular Permalloy disc

Effect of void geometry and magnetic anisotropy in controlling the vortex in sub-micron annular Permalloy disc

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