Thermal effects in a Stoner–Wohlfarth model and their influence on magnetic anisotropy determination

Franco, V.; Conde, A.

doi:10.1016/j.jmmm.2003.11.370

Cited by 27 publications

(10 citation statements)

References 41 publications

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“…However, such values and the hysteresis loops shape are very different for CoFe 2.7 /CoFe 2 O 4 core/shell nanowires. The smoothed hysteresis loop for the core/shell nanowires is related with the lost of spatial order when them are released from the AAO template [44]. On the other hand, the CoFe 2 O 4 layer formed during the oxidation process strongly influences the magnetization dynamic.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

et al. 2017

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A straightforward method for the synthesis of CoFe/CoFeO core/shell nanowires is described. The proposed method starts with a conventional pulsed electrodeposition procedure on alumina nanoporous template. The obtained CoFe nanowires are released from the template and allowed to oxidize at room conditions over several weeks. The effects of partial oxidation on the structural and magnetic properties were studied by x-ray spectrometry, magnetometry, and scanning and transmission electron microscopy. The results indicate that the final nanowires are composed of 5 nm iron-cobalt alloy nanoparticles. Releasing the nanowires at room conditions promoted surface oxidation of the nanoparticles and created a CoFeO shell spinel-like structure. The shell avoids internal oxidation and promotes the formation of bi-magnetic soft/hard magnetic core/shell nanowires. The magnetic properties of both the initial single-phase CoFe nanowires and the final core/shell nanowires, reveal that the changes in the properties from the array are due to the oxidation more than effects associated with released processes (disorder and agglomeration).

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Section: Accepted Manuscriptmentioning

confidence: 99%

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

et al. 2017

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“…12-26), the loop shape, coercive force and specific power loss in dynamic magnetic hysteresis (e.g., Refs. [27][28][29][30][31][32][33][34], the signal-to-noise ratio in stochastic resonance (e.g., Refs. [35][36][37][38][39][40], the switching field curves and surfaces at finite temperatures (e.g., Refs.…”

Section: A Thermal Instability Of Magnetization In Fine Particlesmentioning

confidence: 99%

Thermal fluctuations of magnetic nanoparticles: Fifty years after Brown

Coffey

Kalmykov

2012

Journal of Applied Physics

226

249

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The reversal time, superparamagnetic relaxation time, of the magnetization of fine single domain ferromagnetic nanoparticles owing to thermal fluctuations plays a fundamental role in information storage, paleomagnetism, biotechnology, etc. Here a comprehensive tutorial-style review of the achievements of fifty years of development and generalizations of the seminal work of Brown [Phys. Rev. 130, 1677] on thermal fluctuations of magnetic nanoparticles is presented. Analytical as well as numerical approaches to the estimation of the damping and temperature dependence of the reversal time based on Brown's Fokker-Planck equation for the evolution of the magnetic moment orientations on the surface of the unit sphere are critically discussed while the most promising directions for future research are emphasized. V C 2012 American Institute of Physics. [http://dx

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“…The solid or dashed lines of the two elemental data sets are fits with various h values (the remaining fit parameter is only the vertical scaling) to show the sensitivity of the fit. Possible temperature dependent anisotropy corrections to the SW treatment 26 have not been included.…”

Section: Resultsmentioning

confidence: 99%

Tailoring perpendicular magnetic coupling by XMCD

et al. 2017

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The elemental perpendicular magnetic anisotropy constants of both elements of a 20 nm bcc Co88Mn12 alloy film grown on MgO(001) and capped with Al, have been determined. By fitting a Stoner-Wohlfarth astroid model to the measured Co and Mn L3 XMCD peak intensities as a function of incidence photon angle with the magnetic field applied co-axially with the photon propagation direction, the elemental perpendicular anisotropy constants were found to be −6.46 x 105 J/m3 and −6.68 x 105 J/m3, respectively. The modeling of the Co and Mn data both result in nearly the same anisotropy constant as expected for a single alloy film.

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Thermal effects in a Stoner–Wohlfarth model and their influence on magnetic anisotropy determination

Cited by 27 publications

References 41 publications

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

Thermal fluctuations of magnetic nanoparticles: Fifty years after Brown

Tailoring perpendicular magnetic coupling by XMCD

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