Theoretical Approach to the Asymmetrical Magnetization Curve

Aharoni, Amikam; Frei, E. H.; Shtrikman, S.

doi:10.1063/1.2185972

Cited by 17 publications

(17 citation statements)

References 9 publications

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“…Taken alone, however dipolar interactions insufficiently account for the onset and magnitude of heating observed in the current set of samples . Using standard models, we might consider that the magnetic anisotropy of the colloid can be quantified through the anisotropy field ( H k ), which can be determined directly from the peak positions measured using transverse susceptibility (Experimental Section and the Supporting Information) . In particular, we consider a model based on the work necessary to magnetize a unit volume of a magnetic material which is understood to be

d W = \vec{H} \cdot d \vec{M}

where H is the applied magnetic field and M is the magnetization.…”

Section: Resultsmentioning

confidence: 99%

Internal Magnetic Structure of Nanoparticles Dominates Time‐Dependent Relaxation Processes in a Magnetic Field

Dennis

Krycka

Borchers

et al. 2015

Adv Funct Materials

119

137

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Magnetic nanoparticles provide a unique combination of small size and responsiveness to magnetic fields making them attractive for applications in electronics, biology, and medicine. When exposed to alternating magnetic fields, magnetic nanoparticles can generate heat through loss power mechanisms that continue to challenge a complete physical description. The influence of internal nanoparticle (intracore) magnetic domain structure on relaxation remains unexplored. Within the context of potential biomedical applications, this study focuses on the dramatic differences observed among the specific loss power of three magnetic iron oxide nanoparticle constructs having comparable size and chemical composition. Analysis of polarization analyzed small angle neutron scattering data reveals unexpected and complex coupling among magnetic domains within the nanoparticle cores that influences their interactions with external magnetic fields. These results challenge the prevailing concepts in hyperthermia which limit consideration to size and shape of magnetic single domain nanoparticles.

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d W = \vec{H} \cdot d \vec{M}

where H is the applied magnetic field and M is the magnetization.…”

Section: Resultsmentioning

confidence: 99%

Internal Magnetic Structure of Nanoparticles Dominates Time‐Dependent Relaxation Processes in a Magnetic Field

Dennis

Krycka

Borchers

et al. 2015

Adv Funct Materials

119

137

View full text Add to dashboard Cite

show abstract

“…We have calculated the transverse susceptibility based on the Stoner-Wohlfarth model 11,19 for the same field geometry ͑i.e., ϭ90), and this is plotted in the inset of Fig. 2͑a͒.…”

mentioning

confidence: 99%

Probing magnetic anisotropy effects in epitaxialCrO2thin films

et al. 2000

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The magnetic anisotropy in ferromagnetic chromium dioxide thin films (T c ϳ393 K) grown epitaxially on ͑100͒ TiO 2 substrates, is probed using precise rf transverse susceptibility ( T ) measurements. Singular peaks in T are observed that are associated with the anisotropy (ϮH K ) and switching (ϮH s ) fields in CrO 2 . Theoretical calculations of T based on a simple coherent rotation model display remarkable agreement with the experimental data, indicating that these thin films behave like single-domain magnetic particles. Magnetoelastic contributions to the total anisotropy energy are needed to describe the evolution of T peaks at lower temperatures.Magnetoelectronics is a field of current topical interest and several materials exhibiting a high degree of spin polarization are being investigated for use in tunnel junctions and spin-based devices.

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“…It is assumed that in a ferromagnetic layer on an anti-ferromagnetic substrate, the vector of magnetic momentum M can be clamped at the boundary between the layer and the substrate. In this two-layer system, some magnetic structures [11,12] can appear when an external magnetic field is applied in the layer plane.…”

Section: Introductionmentioning

confidence: 99%

“…In 1980, Zakharov and Khlebopros [13] reported that solutions written in [12] for the magnetization distribution in a magnetically-soft layer on a magnetically-hard substrate under axial application of a magnetic field can be written in a novel way. Also, some solutions of the problem were originally found by Aharoni [11] in 1959, using the Jacobian elliptic functions [14,15]. Also, the excellent and classical book [16] by Collatz provides solutions of eigenvalue problems with different boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

Studying Magnetization Distribution in Magnetic Thin Films under Transversal Application of Magnetic Fields

Zakharenko¹

2010

JMP

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The problem of magnetization change across the direction of magnetic field for a magnetic layer with non-symmetric boundary conditions was treated. The exact solution of the problem for the magnetization components mx and my was written in the form of complex combination of Jacobian elliptic functions and elliptic integrals. This allows one to demonstrate both the static mode and all dynamic modes for the mag-netization distribution across the layer thickness. The static mode and several dynamic modes, as well as the first and second derivatives of the magnetization components, were calculated. Also, average values of the magnetization components ?mx? and ámy? for the static mode and three dynamic modes were calculated in dependence on the magnetic field. The obtained results can represent an interest in the large amount of ap-plications of magnetic devices such as recording media, memory chips, and computer disks. The results are also useful for checking different numerical methods recently applied to study the problem, because it is thought that any numerical method cannot demonstrate solutions for the dynamic modes

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Theoretical Approach to the Asymmetrical Magnetization Curve

Cited by 17 publications

References 9 publications

Internal Magnetic Structure of Nanoparticles Dominates Time‐Dependent Relaxation Processes in a Magnetic Field

Internal Magnetic Structure of Nanoparticles Dominates Time‐Dependent Relaxation Processes in a Magnetic Field

Probing magnetic anisotropy effects in epitaxialCrO2thin films

Studying Magnetization Distribution in Magnetic Thin Films under Transversal Application of Magnetic Fields

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