Experimental Evidence of the Néel-Brown Model of Magnetization Reversal

Wernsdorfer, Wolfgang; Orozco, E. Bonet; Hasselbach, K.; Benoı̂t, A.; Barbara, B.; Demoncy, N.; Loiseau, A.; Pascard, H.; Mailly, D.

doi:10.1103/physrevlett.78.1791

Cited by 621 publications

(509 citation statements)

References 31 publications

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“…An almost logarithmic dependence at small sweeping rate can be observed as in Ref. 7 whose experimental results are shown for comparison. In these experiments the mean switching field has been measured over several hundred cycles.…”

Section: Temperature and Field Sweeping Rate Dependence Of The Reverssupporting

confidence: 53%

“…Actually, the magnetisation reversal process depends, as the stable states, on the two ratios R/λ and R/δ. In their experiments, W. Wernsdorfer et al [7] have investigated a single domain Co nanoparticle with a radius of (12.5±2.5) nm which yields R/λ ≃ 1.5 and R/δ ≃ 0.7. Here, we have considered a 33−spin nanoparticle (R = 2a, a is the lattice parameter) with J = k B and D = 0.1 J so R/λ ≃ 1 and R/δ ≃ 0.3.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: a Monte Carlo investigation

Ledue¹,

Berche²,

Patte³

2004

Physica B: Condensed Matter

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We investigate the thermal activated magnetisation reversal in a single ferromagnetic nanoparticle with uniaxial anisotropy using Monte Carlo simulations. The aim of this work is to reproduce the reversal magnetisation by uniform rotation at very low temperature in the high energy barrier hypothesis, that is to realize the Néel-Brown model. For this purpose we have considered a simple cubic nanoparticle where each site is occupied by a classical Heisenberg spin. The Hamiltonian is the sum of an exchange interaction term, a single-ion anisotropy term and a Zeeman interaction term. Our numerical data of the thermal variation of the switching field are compared to an approximated expression and previous experimental results on Co nanoparticles.

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Section: Temperature and Field Sweeping Rate Dependence Of The Reverssupporting

confidence: 53%

Section: Numerical Resultsmentioning

confidence: 99%

Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: a Monte Carlo investigation

Ledue¹,

Berche²,

Patte³

2004

Physica B: Condensed Matter

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“…(3) in Ref. [15] ]. Knowing these parameters, the model of Kurkijärvi pre- dicts the switching field distribution [the width s is given by Eq.…”

mentioning

confidence: 99%

Macroscopic Quantum Tunneling of Magnetization of Single Ferrimagnetic Nanoparticles of Barium Ferrite

et al. 1997

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“…The size and shape of the particle as well as the materials properties will affect the value. Experimental measurements by Wernsdorfer et al [14] on 30 nm diameter Co nanoparticles gave an estimate of 4×10 9 sec −1 .…”

Section: Introductionmentioning

confidence: 95%

Thermal stability of magnetic states in submicron magnetic islands

Liashko¹,

Lobanov²,

Uzdin³

et al. 2017

Nanosystems: Phys. Chem. Math.

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The lifetime of magnetic states in single domain micromagnetic islands is calculated within the harmonic approximation to transition state theory. Stable magnetic states, minimum energy paths between them and first order saddle points determining the activation energy are analyzed and visualized on two-dimensional energy surfaces. An analytical expression is derived for the pre-exponential factor in the Arrhenius rate expression for the reversal of the magnetic moment when the external field is directed either along the anisotropy axis or perpendicular to it.

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Experimental Evidence of the Néel-Brown Model of Magnetization Reversal

Cited by 621 publications

References 31 publications

Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: a Monte Carlo investigation

Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: a Monte Carlo investigation

Macroscopic Quantum Tunneling of Magnetization of Single Ferrimagnetic Nanoparticles of Barium Ferrite

Thermal stability of magnetic states in submicron magnetic islands

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