Grain boundary anisotropy on nano-polycrystalline magnetic thin films

Jose D Agudelo-Giraldo,Johans Restrepo,Elisabeth Restrepo-Parra

doi:10.1038/s41598-020-61979-z

Jose D Agudelo-Giraldo, Johans Restrepo + Show 1 more

Open Access

https://doi.org/10.1038/s41598-020-61979-z

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Abstract

Grain boundaries in polycrystalline thin films with crystallite sizes at nanoscale presents regions characterized by a high degree of local structural disorder. As a consequence, great values of the associated local anisotropies are expected. On this regard, a systematic investigation of the effect of the grain boundary anisotropy on the magnetic properties in such type of nanostructured systems is addressed. For developing this work, a standard Monte Carlo simulation in the framework of classical Heisenberg spins was carried out, with a Hamiltonian involving exchange couplings, dipolar interactions, Zeeman interaction and contributions of cubic magneto-crystalline anisotropy. A quantification of local structural disorder was considered. Results revealed that i) by keeping the same number of grains, different organizations give rise to different spontaneous magnetizations, ii) the critical exponent of the magnetization differs of pure models, which is attributed to the complexity of the lattice and consistent with a distribution of critical temperatures, iii) Boundary anisotropy varies with temperature and its strength are determinant factors for blocking temperatures, and iv) Boundary anisotropy inside in the hysteretic properties where coercive field variations are observed.

Highlights

Grain boundaries in polycrystalline thin films with crystallite sizes at nanoscale presents regions characterized by a high degree of local structural disorder
With grains in nanoscale, anisotropy depends strongly of the loss of correlation by grain size effect more than magneto-crystalline anisotropy. ii) Experimentally, surface anisotropy generated a perpendicular orientation well stablished at very low thickness, less than 10 muc, that thickness was stablished like criterium iii) dipolar interaction is proportional to D parameter obtained www.nature.com/scientificreports by mean D = μ0μg2/4πa[3]
Authors concluded that differences are strongly influenced by long range interparticle interactions and by local structural disorder giving rise to different realizations of the grain distribution including different crystallite orientations

Summary

Introduction

Grain boundaries in polycrystalline thin films with crystallite sizes at nanoscale presents regions characterized by a high degree of local structural disorder. Parameters K1i and K2i account for the magnitude of the mangetocrystalline anisotropy interaction for which a functional dependence on temperature, in addition to a local structural term, has been proposed.

Results

Conclusion