Observation and modelling of magnetic vortex core structure in Permalloy nanoparticles

Lobue, Martino; Mazaleyrat, F.; Ammar, Mehdi; Barrué, R.; Champion, Yannick; Faure, Stéphane; Hÿtch, Martin; Snoeck, E.; Steiner, Jutta; Alouges, François

doi:10.1016/j.jmmm.2009.04.081

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…Nanostructures with vortices as their magnetic configuration have potential for a range of technological applications from data storage and spintronics [9][10][11][12] to magnetic sensors used in medicine for cancer treatment [13] to quantum information processing [14]. Using magnetic vortices in data storage presents specific benefits, such as allowing a high data storage density in a limited space, while the vortex stability can be advantageous for long-term storage information.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dimension and Magnetic Interactions on Annihilation and Nucleation Fields of Permalloy Nanodisks Using Micromagnetic Simulations

Urcia-Romero,

Vigo-Cotrina,

Jáuregui-Rosas

2024

Momento

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Permalloy can exhibit magnetic vortex configurations depending on their dimensions and geometry, being of great interest due to potential applications in data storage and for cancer treatment. This work focuses on the effects of perpendicular uniaxial anisotropy, dimensions of permalloy nanodisks, and magnetostatic interactions on the annihilation and nucleation fields of magnetic vortices by means of micromagnetic simulations. Nanodisks with different diameters were evaluated, considering the effect of anisotropy generated by a platinum substrate for isolated nanodisks of 20 nm thickness. The effect of magnetostatic interactions for different arrays of identical nanodisks and a 10 x 10 array with random diameters from a normal distribution was also evaluated. The results show that the annihilation and nucleation fields are influenced by the perpendicular uniaxial anisotropy. The higher the anisotropy, the more the annihilation field decreases, and the nucleation field increases, thus favoring the monodomain magnetic configuration. It was also shown that the magnetic interaction between the nanodisks and the lattice geometry led to a variation of the annihilation and nucleation fields. The magnetostatic interaction in the lattice leads to a collective rotation of the magnetic moments, so that the closing of the magnetic flux occurs randomly in a series of nanodisks minimizing the energy.

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Section: Introductionmentioning

confidence: 99%

Influence of Dimension and Magnetic Interactions on Annihilation and Nucleation Fields of Permalloy Nanodisks Using Micromagnetic Simulations

Urcia-Romero,

Vigo-Cotrina,

Jáuregui-Rosas

2024

Momento

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“…However, Néel assumed that for soft ferromagnetic particles of spherical shape, a curling or vortex configuration around a major axis is favored above the diameter for the SD regime. 6) Several experiments and micromagnetic simulations have revealed the presence of three-dimensional (3D) vortex states (VS) in hemispherical Ni and Fe NPs 7,8) in permalloy nanospheres [9][10][11] and chains. 12,13) The formation of superparamagnetic or ferromagnetic Fe 3 O 4 NCs or array structures induced by magnetic fields has been reported.…”

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confidence: 99%

Size-dependent changeover in magnetization reversal mode of self-assembled one-dimensional chains of spherical Fe₃O₄ nanoparticles

Samardak¹,

Davydenko²,

Ognev³

et al. 2016

Jpn. J. Appl. Phys.

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Understanding the ferromagnetic behavior of coupled magnetic nanoparticles (NPs) in a chain structure, called a “nanochain (NC)”, will open up new routes for its practical use. Here, we report the magnetization reversal modes in isolated magnetite (Fe3O4) NPs with diameters of 100 and 200 nm, as well as those of one-dimensional (1D) self-assembled NCs consisting of these NPs. NCs consisting of 100-nm diameter NPs switched through a transverse domain wall-like motion. Meanwhile, in 200-nm diameter NPs and NCs, we observed 3D magnetic vortex states that were more energetically favorable than single domain or multidomain states.

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Brownian dynamics simulations of ellipsoidal magnetizable particle suspensions

Torres‐Díaz¹,

Rinaldi²

2014

J. Phys. D: Appl. Phys.

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Observation and modelling of magnetic vortex core structure in Permalloy nanoparticles

Cited by 8 publications

References 13 publications

Influence of Dimension and Magnetic Interactions on Annihilation and Nucleation Fields of Permalloy Nanodisks Using Micromagnetic Simulations

Influence of Dimension and Magnetic Interactions on Annihilation and Nucleation Fields of Permalloy Nanodisks Using Micromagnetic Simulations

Size-dependent changeover in magnetization reversal mode of self-assembled one-dimensional chains of spherical Fe₃O₄ nanoparticles

Brownian dynamics simulations of ellipsoidal magnetizable particle suspensions

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Observation and modelling of magnetic vortex core structure in Permalloy nanoparticles

Cited by 8 publications

References 13 publications

Influence of Dimension and Magnetic Interactions on Annihilation and Nucleation Fields of Permalloy Nanodisks Using Micromagnetic Simulations

Influence of Dimension and Magnetic Interactions on Annihilation and Nucleation Fields of Permalloy Nanodisks Using Micromagnetic Simulations

Size-dependent changeover in magnetization reversal mode of self-assembled one-dimensional chains of spherical Fe3O4 nanoparticles

Brownian dynamics simulations of ellipsoidal magnetizable particle suspensions

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Size-dependent changeover in magnetization reversal mode of self-assembled one-dimensional chains of spherical Fe₃O₄ nanoparticles