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FORC diagram features of Co particles due to reversal by domain nucleation by Leoni Breth; Johann Fischbacher; Alexander Kovacs; Harald Oezelt; Thomas Schrefl; Hubert Brueckl; Christoph Czettl; Saskia Kührer; Julia Pachlhofer; Maria Schwarz is a Materials Science article available to read on EtoBox.

What is FORC diagram features of Co particles due to reversal by domain nucleation about?

First Order Reversal Curve (FORC) diagrams are a popular tool in geophysics and materials science for the characterization of magnetic particles of natural and synthetic origin. However, there is still a lot of controversy about the rigorous interpretation of the origin of certain features in a FORC diagram. In this study, we analyze FORCs computed by micromagnetic simulations of Co cubes with dimensions of 50, 100 and 150 nm and uniaxial magnetocrystalline anisotropy. For the larger cubes we observe the formation of a stable two-domain state. The nucleation of a reversed domain and its subsequent annihilation are clearly visible as separate peaks in the FORC diagram. They spread out along the coordinate axis in the FORC diagram, which is associated with the bias field H U of a Preisach hysteron. Based on our findings, we state that a FORC diagram peak spreading along the H U axis can have its origin in the step-wise magnetization reversal driven by nucleation of domains in a single particle. This means that we have identified another mechanism apart from the well-known magnetostatic interaction between a set of particles that leads to features in the FORC diagram extending along t

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Author

Leoni Breth; Johann Fischbacher; Alexander Kovacs; Harald Oezelt; Thomas Schrefl; Hubert Brueckl; Christoph Czettl; Saskia Kührer; Julia Pachlhofer; Maria Schwarz

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)