Directional-dependent coercivities and magnetization reversal mechanisms in fourfold ferromagnetic systems of varying sizes

Błachowicz, Tomasz; Ehrmann, Andrea; Steblinski, Pawel; Palka, J.

doi:10.1063/1.4772459

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Further simulations have shown that the magnetic properties and magnetization dynamics of such nanostructured systems strongly depend on the lateral dimensions of the system as well as on the wire diameters. 22 This article aims at investigating the influence of the lateral dimensions, tailored by e-beam lithography, of a real fourfold magnetic structures made with lateral dimensions between 160 nm and 400 nm. The shape of the samples presented can be classified between magnetic rings with their vortices and fourfold wire systems with the possibility of a stable intermediate state for a zero-valued externally applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of square Py nanowires: Irradiation dose and geometry dependence

Ehrmann

Błachowicz

Komraus

et al. 2015

Journal of Applied Physics

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Arrays of ferromagnetic patterned nanostructures with single particle lateral dimensions between 160 nm and 400 nm were created by electron-beam lithography. The fourfold particles with rectangular-shaped walls around a square open area were produced from permalloy. Their magnetic properties were measured using the longitudinal magneto-optical Kerr effect. The article reports about the angle-dependent coercive fields and the influence of the e-beam radiation dose on sample shapes. It is shown that a broad range of radiation dose intensities enables reliable creation of nanostructures with parameters relevant for the desired magnetization reversal scenario. The experimental results are finally compared with micromagnetic simulations to explain the findings. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Magnetic properties of square Py nanowires: Irradiation dose and geometry dependence

Ehrmann

Błachowicz

Komraus

et al. 2015

Journal of Applied Physics

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“…To the date metallic nanoframes have shown outstanding optical 17 , magnetic 18 , and electrochemical 16 properties. For instance, the magnetization of 2D square nanoframes was studied by micromagnetic simulations 19 . Different magnetization reversal processes were obtained when the system size conditions were varied.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the magnetic response on polycrystalline nanoframes through mechanical deformation

Castro

Baltazar

Rojas-Nunez

et al. 2022

Sci Rep

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The mechanical and magnetic properties of polycrystalline nanoframes were investigated using atomistic molecular dynamics and micromagnetic simulations. The magneto-mechanical response of Fe hollow-like nanocubes was addressed by uniaxial compression carried out by nanoindentation. Our results show that the deformation of a nanoframe is dominated at lower strains by the compression of the nanostructure due to filament bending. This leads to the nanoframe twisting perpendicular to the indentation direction for larger indentation depths. Bending and twisting reduce stress concentration and, at the same time, increase coercivity. This unexpected increase of the coercivity occurs because the mechanical deformation changes the cubic shape of the nanoframe, which in turn drives the system to more stable magnetic states. A coercivity increase of almost 100 mT is found for strains close to 0.03, which are within the elastic regime of the Fe nanoframe. Coercivity then decreases at larger strains. However, in all cases, the coercivity is higher than for the undeformed nanoframe. These results can help in the design of new magnetic devices where mechanical deformation can be used as a primary tool to tailor the magnetic response on nanoscale solids.

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“…In this state, further increasing the external magnetic field leads to small rotations of magnetization, but no irreversible switches, and the full orientation along the external magnetic field could be reached without irreversible steps. On the other hand, intentional shape deviations can be used to stabilize a certain desired magnetic state [27].…”

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal in Concave Iron Nano-Superellipses

Öncü¹,

Ehrmann²

2021

Condensed Matter

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Square magnetic nanodots can show intentional or undesired shape modifications, resulting in superellipses with concave or convex edges. Some research groups also concentrated on experimentally investigating or simulating concave nano-superellipses, sometimes called magnetic astroids due to their similarity to the mathematical shape of an astroid. Due to the strong impact of shape anisotropy in nanostructures, the magnetization-reversal process including coercive and reversibility fields can be expected to be different in concave or convex superellipses than that in common squares. Here, we present angle-dependent micromagnetic simulations on magnetic nanodots with the shape of concave superellipses. While magnetization reversal occurs via meander states, horseshoe states or the 180° rotation of magnetization for the perfect square, depending on the angle of the external magnetic field, more complicated states occur for superellipses with strong concaveness. Even apparently asymmetric hysteresis loops can be found along the hard magnetization directions, which can be attributed to measuring minor loops since the reversibility fields become much larger than the coercive fields.

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Directional-dependent coercivities and magnetization reversal mechanisms in fourfold ferromagnetic systems of varying sizes

Cited by 16 publications

References 26 publications

Magnetic properties of square Py nanowires: Irradiation dose and geometry dependence

Magnetic properties of square Py nanowires: Irradiation dose and geometry dependence

Enhancing the magnetic response on polycrystalline nanoframes through mechanical deformation

Magnetization Reversal in Concave Iron Nano-Superellipses

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