First-order reversal curves analysis in nanocrystalline ribbons

Martínez-García, J.C.; Rivas, M.; Lago-Cachón, D.; Garcı́a, J.A.

doi:10.1088/0022-3727/47/1/015001

Cited by 20 publications

(19 citation statements)

References 29 publications

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“…In the FDiag, according to definition (2), this results in a pair of colored spots, which are blue-red (always blue color on the left) for k > 0 and red-blue for k < 0. 21 FDiag of positive or negative interactions within onephase systems [21][22][23][24] as well as for two positively coupled magnetic phases [25][26][27] are abundant in the literature. Nevertheless, round red-blue spots as that appearing in Fig.…”

mentioning

confidence: 99%

Magnetostatic interaction in soft magnetic bilayer ribbons unambiguously identified by first-order reversal curve analysis

Rivas

Martínez-García

Škorvánek

et al. 2015

Applied Physics Letters

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confidence: 99%

Magnetostatic interaction in soft magnetic bilayer ribbons unambiguously identified by first-order reversal curve analysis

Rivas

Martínez-García

Škorvánek

et al. 2015

Applied Physics Letters

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“…Later, Pike, Roberts, and collaborators conducted the first experimental procedure on geological samples [16]. Additional studies using FORC were based on nanostructured array systems [17,18,[31][32][33][34], nanocrystalline [35,36], and hard magnetic materials [19]. The FORC measurement starts in magnetic saturation.…”

Section: A First-order Reversal Curve Methodsmentioning

confidence: 99%

Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi

et al. 2017

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We have performed first-order reversal curve (FORC) measurements to investigate the irreversible magnetization processes in the low-temperature phase of MnBi. Using temperature-dependent FORC analysis, we are able to provide a clear insight into the effects of microstructural parameters such as grain diameter, shape, and surface composition on the coercivity of nucleation hardened permanent magnet MnBi. FORC diagrams of MnBi show a unique broadening and narrowing of the coercive field distribution with increasing temperature. We were able to microscopically identify the reason for this behavior, based on the shift in the single domain critical diameter from nearly 1 to 2 μm, thereby changing the dependence of coercivity with particle size. This is based on a strong increase in the uniaxial anisotropy constant with increasing temperature. Furthermore, the results also give an additional confirmation that the magnetic hardening in low-temperature phase MnBi occurs due to nucleation mechanisms. In our case, we show that temperature-dependent FORC measurements provide a powerful tool for the microscopic understanding of high-performance permanent magnet systems.

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“…The hysteresis curve for nanocrystallized soft magnetic systems was extracted from the intrinsic switching field distribution of the sample, as it is simulated with a combination of a Gaussian distributions [16], that has an intersection of ideas with [11]; other approach is based on the solid base of Landau-Lifshitz-Gilbert equations [17].…”

Section: General Remarksmentioning

confidence: 99%

Magnetoelectric effects theory by Heisenberg method based on permutation group symmetry of nanoparticles

Leble¹

2020

Nanosystems: Phys. Chem. Math.

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The Heisenberg theory of ferromagnetism is widened to include external electric field action. The material relations are derived by means of differentiation of logarithm of partition function with respect to the magnetic and electric fields. The mean energy coefficients as the exchange integrals combinations are expressed via characters of irreducible representations of corresponding permutation groups by the Heitler method. The thermodynamic equations of state for polarization and magnetization, as functions of the electric and magnetic fields, are derived and illustrated by figures. The magnetization and hysteresis curves in magnetization -magnetic field components plane are built. The theory is applied to nanoparticles, the particle partition function is modeled as the product of the surface and bulk parts. The statistical sum is constructed having explicit expressions for the mean energy in terms of exchange integrals and number of closest neighbors for surface and bulk atoms. The relative contribution of the surface and bulk terms is evaluated.

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First-order reversal curves analysis in nanocrystalline ribbons

Cited by 20 publications

References 29 publications

Magnetostatic interaction in soft magnetic bilayer ribbons unambiguously identified by first-order reversal curve analysis

Magnetostatic interaction in soft magnetic bilayer ribbons unambiguously identified by first-order reversal curve analysis

Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi

Magnetoelectric effects theory by Heisenberg method based on permutation group symmetry of nanoparticles

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