Micromagnetic simulation of Fe asymmetric nanorings

Palma, Juan Luis; Morales-Concha, C.; Leighton, B.; Altbir, D.; Escrig, Juan

doi:10.1016/j.jmmm.2011.09.001

Cited by 17 publications

(8 citation statements)

References 25 publications

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“…In agreement with the literature [ 52 ], micromagnetic simulations show that the magnetization reversal process in long cylindrical Fe NWs (3 µm in length) occurs through the nucleation and propagation of a vortex domain wall (V-DW) from the NW extremities (see inset in Figure 3 a). Similarly, the magnetic reversal in the 300 nm length segmented Fe NWs occurs through the nucleation and propagation of a V-DW from the extremities of each segment, regardless of the number of bilayers (see insets in Figure 3 b,c).…”

Section: Resultssupporting

confidence: 90%

The Magnetic Properties of Fe/Cu Multilayered Nanowires: The Role of the Number of Fe Layers and Their Thickness

et al. 2021

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Multi-segmented bilayered Fe/Cu nanowires have been fabricated through the electrodeposition in porous anodic alumina membranes. We have assessed, with the support of micromagnetic simulations, the dependence of fabricated nanostructures’ magnetic properties either on the number of Fe/Cu bilayers or on the length of the magnetic layers, by fixing both the nonmagnetic segment length and the wire diameter. The magnetic reversal, in the segmented Fe nanowires (NWs) with a 300 nm length, occurs through the nucleation and propagation of a vortex domain wall (V-DW) from the extremities of each segment. By increasing the number of bilayers, the coercive field progressively increases due to the small magnetostatic coupling between Fe segments, but the coercivity found in an Fe continuous nanowire is not reached, since the interactions between layers is limited by the Cu separation. On the other hand, Fe segments 30 nm in length have exhibited a vortex configuration, with around 60% of the magnetization pointing parallel to the wires' long axis, which is equivalent to an isolated Fe nanodisc. By increasing the Fe segment length, a magnetic reversal occurred through the nucleation and propagation of a V-DW from the extremities of each segment, similar to what happens in a long cylindrical Fe nanowire. The particular case of the Fe/Cu bilayered nanowires with Fe segments 20 nm in length revealed a magnetization oriented in opposite directions, forming a synthetic antiferromagnetic system with coercivity and remanence values close to zero.

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Section: Resultssupporting

confidence: 90%

The Magnetic Properties of Fe/Cu Multilayered Nanowires: The Role of the Number of Fe Layers and Their Thickness

et al. 2021

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“…This assumption was experimentally verified in multi-segmented Co/Cu NWs prepared by electrodeposition into AAO templates, where a saturation magnetization value of 1200 emu/cm 3 , instead of 1400 emu/cm 3 , was determined for Co and was justified by the presence of Cu impurities in Co [ 53 ]. We used an exchange coupling constant A = 43 × 10 −8 erg/cm [ 54 , 55 ] and a Fe magnetocrystalline anisotropy value K = 4.8 × 10 5 erg/cm 3 , based on the X-ray diffraction measurements. Cell size was chosen to be (2.5 × 2.5 × 2.5) nm 3 , which was two times smaller than Fe exchange length

.…”

Section: Resultsmentioning

confidence: 99%

The Role of Cu Length on the Magnetic Behaviour of Fe/Cu Multi-Segmented Nanowires

et al. 2018

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A set of multi-segmented Fe/Cu nanowires were synthesized by a two-step anodization process of aluminum substrates and a pulsed electrodeposition technique using a single bath. While both Fe segment length and diameter were kept constant to (30 ± 7) and (45 ± 5) nm, respectively, Cu length was varied between (15 ± 5) and (120 ± 10) nm. The influence of the non-magnetic layer thickness variation on the nanowire magnetic properties was investigated through first-order reversal curve (FORC) measurements and micromagnetic simulations. Our analysis confirmed that, in the multi-segmented Fe/Cu nanowires with shorter Cu segments, the dipolar coupling between Fe segments controls the nanowire magnetic behavior, and its performance is like that of a homogenous Fe nanowire array of similar dimensions. On the other hand, multi-segmented Fe/Cu nanowires with larger Cu segments act like a collection of non-interacting magnetic entities (along the nanowire axis), and their global behavior is mainly controlled by the neighbor-to-neighbor nanodisc dipolar interactions.

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“…Thus, the field direction determines specific circulations of the magnetic vortex in asymmetric discs. Other geometries considered in this regard include rings with an ellipse or an offset hole within [5][6][7] or rings with flat edges [8,9]. Controllable switching of circularity is also demonstrated using magnetic field gradient [10], magnetic field pulses [11], etc.…”

Section: Introductionmentioning

confidence: 99%

Asymmetry-driven reconfigurability of magnetic vortices in hemispherical shells

2023

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Inhomogeneous magnetic configurations like vortices attract tremendous appeal as an emerging candidate in understanding nanoscale spin behaviours and utilizing their spin configurations for advanced technological applications. For vortex-driven practical applications, independent control and manipulation of both the circularity and polarity of the magnetic vortex is a prerequisite. In this study, we have shown that both the circularity and polarity of the magnetic vortex in an asymmetric hemispherical shell can be controlled by changing a single parameter - the direction of the in-plane external magnetic field. Furthermore, our results demonstrate the influence of geometrical asymmetry on the characteristics of magnetic vortices in ferromagnetic permalloy shells. These findings are expected to be helpful while designing vortex-based advanced technologies.

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Micromagnetic simulation of Fe asymmetric nanorings

Cited by 17 publications

References 25 publications

The Magnetic Properties of Fe/Cu Multilayered Nanowires: The Role of the Number of Fe Layers and Their Thickness

The Magnetic Properties of Fe/Cu Multilayered Nanowires: The Role of the Number of Fe Layers and Their Thickness

The Role of Cu Length on the Magnetic Behaviour of Fe/Cu Multi-Segmented Nanowires

Asymmetry-driven reconfigurability of magnetic vortices in hemispherical shells

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