Magnetic nanoparticles: From the nanostructure to the physical properties

Batlle, X.; Moya, Carlos; Escoda-Torroella, Mariona; Iglesias, Òscar; Rodríguez, A. Fraile; Labarta, Amílcar

doi:10.1016/j.jmmm.2021.168594

Cited by 57 publications

(25 citation statements)

References 283 publications

(26 reference statements)

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“…This can be seen by inspecting the definition of the Fourier transform in (32). Note that for q → 0 the Fourier transform is proportional to the average of the magnetization vector field M and the maximum of this average is given by the homogeneous magnetization state.…”

Section: Magnetic Sans Cross Sectionmentioning

confidence: 99%

“…In our graphical representations, we will frequently use the following values: k c = 0.1 and k s = 3.0, which (using R = 5 nm and A = 10 −11 J/m) correspond to K c = 40 kJ/m 3 and [32,33]. For M 0 = 1.7 × 10 6 A/m, the relation between b 0 (dimensionless) and the external field is B 0 = 4/17b 0 × 1T.…”

Section: Micromagnetic Theorymentioning

confidence: 99%

“…Next, in (32) we use the following first-order approximation for the real-space magnetization vector m(ξ) [see ( 5) and (7)]…”

Section: Magnetic Sans Cross Sectionmentioning

confidence: 99%

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Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment

Adams¹,

Michels²,

Kachkachi³

2022

Preprint

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The magnetization profile and the related magnetic small-angle neutron scattering cross section of a single spherical nanoparticle with Néel surface anisotropy is analytically investigated. We employ a Hamiltonian that comprises the isotropic exchange interaction, an external magnetic field, a uniaxial magnetocrystalline anisotropy in the core of the particle, and the Néel anisotropy at the surface.Using a perturbation approach, the determination of the magnetization profile can be reduced to a Helmholtz equation with Neumann boundary condition, whose solution is represented by an infinite series in terms of spherical harmonics and spherical Bessel functions. From the resulting infinite series expansion, we analytically calculate the Fourier transform, which is algebraically related to the magnetic small-angle neutron scattering cross section. The approximate analytical solution is compared to the numerical solution using the Landau-Lifshitz equation, which accounts for the full nonlinearity of the problem. I. INTRODUCTIONMagnetic small-angle neutron scattering (SANS) is a powerful technique for investigating spin structures on the mesoscopic length scale (∼ 1−100 nm) and inside the volume of magnetic materials [1,2]. Recent SANS studies on magnetic nanoparticles, in particular employing spin-polarized neutrons, unanimously demonstrate that their spin textures are highly complex and exhibit a variety of nonuniform, canted, or core-shell-type configurations (see, e.g. Refs. [3][4][5][6][7][8][9][10][11][12][13][14][15] and references therein). The magnetic SANS data analysis largely relies on structural form-factor-models for the cross section, borrowed from nuclear SANS, which do not properly account for the existing spin inhomogeneity inside magnetic nanoparticles or nanomagnets (NM).Progress in magnetic SANS theory [16][17][18][19][20][21][22][23][24][25] strongly suggests that for the analysis of experimental magnetic SANS data the spatial nanometer scale variation of the orientation and magnitude of the magnetization vector field must be taken into account, and that macrospinbased models-assuming a uniform magnetization-are not adequate. The starting point for a proper analysis of the scattering problem is a micromagnetic continuum expression for

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Section: Magnetic Sans Cross Sectionmentioning

confidence: 99%

Section: Micromagnetic Theorymentioning

confidence: 99%

See 1 more Smart Citation

Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment

Adams¹,

Michels²,

Kachkachi³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The difference in contrast between different particles is indicative of the variable magnetic polarities expected from the stochastic deposition process. 82 Tian et al used MFM to observe the process of variation of magnetic domains in garnets within an external field. The process is observed to investigate the movement of domain walls and the variation of domain configurations.…”

Section: Analysis Of Magnetic Materialsmentioning

confidence: 99%

Recent advances in electrospun magnetic nanofibers and their applications

Wang

Liu

et al. 2022

J. Mater. Chem. C

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“…Because of the particles' small sizes they can easily interact with cells, viruses, genes, and enter virtually every region in the human body. Additionally, the MNPs are highly tune-able 9 : by changing their size, composition or synthesis process, desired physical properties and behaviors can be attained such as slow/fast removal from the body, specific reaction to applied magnetic fields, etc. The particle behaviour can be further fine-tuned by coating the particles with specific molecules so they bind to certain entities.…”

Section: Introductionmentioning

confidence: 99%

Perspective: magnetic nanoparticles in theranostic applications

Coene,

Leliaert

2022

Preprint

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Magnetic nanoparticles: From the nanostructure to the physical properties

Cited by 57 publications

References 283 publications

Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment

Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment

Recent advances in electrospun magnetic nanofibers and their applications

Perspective: magnetic nanoparticles in theranostic applications

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