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- W3175008051 abstract "We study the relaxation characteristics in the two-dimensional ($l^{}_x times l^{}_y$) array of magnetic nanoparticles (MNPs) as a function of aspect ratio $A^{}_r=l^{}_y/l^{}_x$, dipolar interaction strength $h^{}_d$ and anisotropy axis orientation using computer simulation. The anisotropy axes of all the MNPs are assumed to have the same direction, $alpha$ being the orientational angle. Irrespective of $alpha$ and $A^{}_r$, the functional form of the magnetization-decay curve is perfectly exponentially decaying with $h^{}_dleq0.2$. There exists a transition in relaxation behaviour at $h^{}_dapprox0.4$; magnetization relaxes slowly for $alphaleq45^circ$; it relaxes rapildy with $alpha>45^circ$. Interestingly, it decays rapidly for $h^{}_d>0.6$, irrespective of $alpha$. It is because the dipolar interaction promotes antiferromagnetic coupling in such cases. There is a strong effect of $alpha$ on the magnetic relaxation in the highly anisotropic system ($A^{}_rgeq25$). Interesting physics unfolds in the case of a huge aspect ratio $A^{}_r=400$. There is a rapid decay of magnetization with $alpha$, even for weakly interacting MNPs. Remarkably, magnetization does not relax even with a moderate value of $h^{}_d=0.4$ and $alpha=0^circ$ because of ferromagnetic coupling dominance. Surprisingly, there is a complete magnetization reversal from saturation (+1) to $-1$ state with $alpha>60^circ$. The dipolar field and anisotropy axis tend to get aligned antiparallel to each other in such a case. The effective Neel relaxation time $tau^{}_N$ depends weakly on $alpha$ for small $h^{}_d$ and $A^{}_rleq25.0$. For large $A^{}_r$, there is a rapid fall in $tau^{}_N$ as $alpha$ is incremented from 0 to $90^circ$. These results benefit applications in data and energy storages where such controlled magnetization alignment and desired structural anisotropy are desirable." @default.
- W3175008051 created "2021-07-05" @default.
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- W3175008051 date "2021-06-27" @default.
- W3175008051 modified "2023-09-27" @default.
- W3175008051 title "Relaxation in Ordered Assembly of Magnetic Nanoparticles" @default.
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- W3175008051 hasPublicationYear "2021" @default.
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