Micromagnetic Hysteresis Results for Magnetite

The repository contains the data and example scripts to reproduce a systematic micromagnetic analysis of magnetic hysteresis in magnetite nad serves as the supplementary material for the paper "Magnetic Hysteresis Properties of Magnetite: Trends with Particle Size and Shape"

Files:

truncated_octahedron_prolate_by_AR.cubit - Coreform Cubit script to create the prolate finite element meshed geometriestruncated_octahedron_oblate_by_AR.cubit - Coreform Cubit script to create the oblate finite element meshed geometries

Example_MERRILL_Script.txt -  Example MERRILL script to simulate the major hysteresis loops

Hysteresis_Data.db - SQLite binary file containing room temperature magnetic hysteresis loops and associated data.

Paleointensity_Transient_Data.csv - The transient hysteresis (Thys), Arai plot curvature, and palaeointensity data used in Figure 11.

M1_AR2p50_Size125_i08.mp4:

Domain state evolution through a major hysteresis loop from positive saturation to the zero-field state and the transient branch sweep back to saturations. This is for a 125 nm pastilce with an aspect ratio of 2.5. The video illustrates near reversible single vortex nucleation and denucleation that yields negligible transient hysteresis behvaior.

M2_AR1p50_Size125_i22.mp4 

Domain state evolution through a major hysteresis loop from positive saturation to the zero-field state and the transient branch sweep back to saturations. This is for a 125 nm pastilce with an aspect ratio of 1.5. The video illustrates irreversible single vortex nucleation and denucleation that result from irreversivle vortex core rotation. This yields notable transient hysteresis behvaior.

M3_AR1p50_Size125_i08.mp4

Domain state evolution through a major hysteresis loop from positive saturation to the zero-field state and the transient branch sweep back to saturations. This is for a 125 nm pastilce with an aspect ratio of 1.5. The video illustrates near reversible single vortex rotation that yields negligible transient hysteresis behvaior.

M4_AR0p500000_Size125_i17.mp4 

Domain state evolution through a major hysteresis loop from positive saturation to the zero-field state and the transient branch sweep back to saturations. This is for a 125 nm pastilce with an aspect ratio of 0.5. The video illustrates irreversible single vortex nucleation and denucleation that result from irreversivle vortex core translation. This yields notable transient hysteresis behvaior.

M5_AR0p500000_Size125_i15.mp4 

Domain state evolution through a major hysteresis loop from positive saturation to the zero-field state and the transient branch sweep back to saturations. This is for a 125 nm pastilce with an aspect ratio of 0.5. The video illustrates near reversible single vortex translation that yields negligible transient hysteresis behvaior.

Hysteresis_Data.db structure:

Hysteresis_Data.db contains 6 tables

DCD_Loops - the DC backfield demagnetization dataHyst_Loops - the upper branch major hysteresis dataHyst_Stats - the summary hysteresis descriptive statisticsLoop_Units - the unist for the column of the "DCD_Loops", "Hyst_Loops ", and "Transient_Loops" tablesStat_Units - the units for the column of the "Hyst_Stats" tableTransient_Loops - the transient loop data