Anisotropy driven reversal of magnetisation in Blume-Capel ferromagnet: A Monte Carlo study

Abstract

The two dimensional Spin-1 Blume-Capel ferromagnet is studied by Monte Carlo simulation with Metropolis algorithm. Starting from initial ordered spin configuration the reversal of magnetisation is investigated in presence of a magnetic field ($h$) applied in the opposite direction. The variations of the reversal time with the strength of single site anisotropy are investigated in details. The exponential dependence was observed. The systematic variations of the mean reversal time with positive and negative anisotropy was found. The mean macroscopic reversal time was observed to be linearly dependent on a suitably defined microscopic reversal time. The saturated magnetisation $M_f$ after the reversal was noticed to be dependent of the strength of anisotropy $D$. An interesting scaling relation was obtained, $|M_f|\sim |h{|}^{\beta }f(D|h{|}^{-\alpha })$ with the scaling function of the form $f(x)=\frac{1}{1+e^{(x-a)/b}}$. The temporal evolution of density of $S_i^z=0$ (surrounded by all $S_i^z=+1$) is observed to be exponentially decaying. The growth of mean density of $S_i^z=-1$ has been fitted in a function ${\rho }_{-1}(t)\sim \frac{1}{a+e^{(t_c-t)/c}}$. The characteristic time shows $t_c\sim e^{-rD}$ and a crossover in the rate of exponential falling is observed at $D=1.5$. The metastable volume fraction has been found to obey the Avrami's law.

arXiv comment10 pages Latex and 16 captioned figues, Four references added

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Cited by in corpus (5)

• Metastable behavior of the spin-s Ising and Blume-Capel ferromagnets: A Monte Carlo study
• Metastability in graded and step like variation of field and anisotropy of the Blume-Capel ferromagnet
• Theoretical studies on switching of magnetisation in thin film
• Competitive metastable behaviours of surface and bulk in Ising ferromagnet
• Disorder effects on the metastability of classical Heisenberg ferromagnets