Quasi-two-dimensional ferromagnetism in the triangular magnet EuAl12O19: Monte Carlo Calculations

This repository contains all classical Monte Carlo calculations relevant for EuAl12O19 material. All calculations were conducted using the UppASD code.

Contents:

in the root directory - all plots published in the Calculations section of the paper, together with underlying data

ab_plane_nodip - a directory containing calculations for M || H || [100] and M || H || [210], showing that the orientation of spins within the ab-plane does not have an effect on the magnetization curves. Calculated without dipolar interaction

dm_effect - a directory containing magnetization curve calculations for a) no Dzyaloshinskii-Moriya interaction (dm_effect/0), b) strong Dzyaloshinskii-Moriya interaction of D = J/2 (dm_effect/0.00125)

fit_nodip - a directory with calculations related to J (exchange interaction energy), K (single-ion anisotropy energy) fitting -- without dipolar interaction

fit_dip - a directory with calculations related to J, K fitting -- with dipolar interaction, source of data for plots in the paper

Note: all directories were archived to .tar.gz files to comply with the file number limit.

MvsB curves

Each directory contains a set of magnetization calculations for various parameters and follows the same strict directory structure: UppASD calculations necessary for the MvsB magnetization curves are found in subdirectory Hsweep/$J/$K/$axis/$T/$H where:

$J is the value of exchange interaction energy (in mRy)

$K is the value of single-ion anisotropy energy (in mRy)

$axis is the direction of both the external field and the magnetization measurement (either 100, 210 or 001)

$T is the temperature (in Kelvins)

$H is the strength of the external field (in Teslas)

Each UppASD calculation contains a set of input files (inpsd.dat, posfile, momfile, jfile, kfile) and output files (*.out).

Furthermore, files Hsweep/$J/$K/$axis/$T/MvsB.dat contain the data for specific MvsB magnetization curve. Files Hsweep/$J/$K/MvsB-[$axis].png contain plots of MvsB magnetization curves for a specific axis and all available temperatures.

MvsT curves

A similar directory structure exists for calculations necessary for the MvsT curves - Tsweep/$J/$K/$axis/$T where the parameters have the same meaning as in the Hsweep directory.

Files Tsweep/$J/$K/$axis/MvsT.dat contain the data for a specific MvsT magnetization curve. Files Tsweep/$J/$K/MvsT.png contain plots of MvsT curves for all available axes.

H = 0.1 T for all MvsT measurements.