Dipolar interaction and sample shape effects on the hysteresis properties of 2d array of magnetic nanoparticles

Anand, Manish

doi:10.1007/s12043-021-02222-w

Cited by 6 publications

(1 citation statement)

References 43 publications

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“…Two-dimensional assemblies of magnetic nanoparticles (MNPs) have received significant attention due to their exciting properties and numerous technological applications [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal in Two-dimensional Ensemble of Nanoparticles with Positional Defects

Anand¹

2021

Preprint

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We study relaxation behaviour in the two-dimensional assembly of magnetic nanoparticles (MNPs) with aligned anisotropy axes and positional defects. The anisotropy axes orientation and disorder strength is changed by varying α and ∆, respectively. The magnetization decay does not depend on the aspect ratio A r of the system and ∆ for small dipolar interaction strength h d = 0.2. Remarkably, the magnetization decays rapidly for considerable h d with negligible ∆ and A r = 1.0. The dipolar interaction of enough strength promotes antiferromagnetic coupling in square ensembles of MNPs. There is a prolonged magnetization decay for large ∆ because of enhancement in ferromagnetic coupling. Notably, magnetization relaxes slowly for α < α even with moderate h d and a significant A r . Interestingly, the slowing down of the magnetic relaxation shifts to a lower α with h d = 1.0. The magnetization ceases to relax for α ≤ 60 • and h d ≤ 0.6 due to large shape anisotropy with A r = 400.0. Remarkably, a majority of the magnetic moment reverses its direction by 180 • for α > 60 • and large h d , resulting in the negative magnetization. The effective Néel relaxation time τ N also depends strongly on these parameters. τ N depends weakly on α and ∆ for h d ≤ 0.2, irrespective of A r . On the other hand, τ N decreases with α for significant h d provided α is greater than 45 • because of antiferromagnetic coupling dominance. In a highly anisotropic system, there is an enhancement in τ N with α (≤ 30 • ) even with moderate h d . While for α > 30 • , τ N decreases with α. These observations are useful in novel materials, spintronics based applications, etc.

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Section: Introductionmentioning

confidence: 99%

Magnetization Reversal in Two-dimensional Ensemble of Nanoparticles with Positional Defects

Anand¹

2021

Preprint

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Ground State Dynamic Hysteresis Properties of Permalloy Nanodisk with Varying Shapes

Çam,

Akıncı

2023

J Supercond Nov Magn

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A micromagnetic study of sample size effects on dynamic hysteresis properties and dynamic phase transitions of Fe and $$Fe_3O_4$$ nanodisks

Çam

2024

J Nanopart Res

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Dipolar interaction and sample shape effects on the hysteresis properties of 2d array of magnetic nanoparticles

Cited by 6 publications

References 43 publications

Magnetization Reversal in Two-dimensional Ensemble of Nanoparticles with Positional Defects

Magnetization Reversal in Two-dimensional Ensemble of Nanoparticles with Positional Defects

Ground State Dynamic Hysteresis Properties of Permalloy Nanodisk with Varying Shapes

A micromagnetic study of sample size effects on dynamic hysteresis properties and dynamic phase transitions of Fe and $$Fe_3O_4$$ nanodisks

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