Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures

Abstract

We present numerical and analytical results for the swiching times of magnetic nanoparticles with uniaxial anisotropy at elevated temperatures, including the vicinity of T_c. The consideration is based in the Landau-Lifshitz-Bloch equation that includes the relaxation of the magnetization magnitude M. The resulting switching times are shorter than those following from the naive Landau-Lifshitz equation due to (i) additional barrier lowering because of the reduction of M at the barrier and (ii) critical divergence of the damping parameters.

4 PR pages, 1 figure

References in corpus (5)

• Fokker-Planck and Landau-Lifshitz-Bloch Equations for Classical Ferromagnets
• Integral Relaxation Time of Single-Domain Ferromagnetic Particles
• Thermally activated escape rates of uniaxial spin systems with transverse field
• Magnetic free energy at elevated temperatures and hysteresis of magnetic particles
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