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

<p>This repository contains all classical Monte Carlo calculations relevant for EuAl12O19 material. All calculations were conducted using the UppASD code.</p> <p>Contents:</p> <ul> <li>in the root directory - all plots published in the Calculations section of the paper, together with underlying data</li> <li><code>ab_plane_nodip</code>&nbsp;- a directory containing calculations for&nbsp;<em>M || H || [100]</em>&nbsp;and&nbsp;<em>M || H || [210]</em>, showing that the orientation of spins within the ab-plane does not have an effect on the magnetization curves. Calculated without dipolar interaction</li> <li><code>dm_effect</code>&nbsp;- a directory containing magnetization curve calculations for a) no Dzyaloshinskii-Moriya interaction (<code>dm_effect/0</code>), b) strong Dzyaloshinskii-Moriya interaction of&nbsp;<em>D = J/2</em>&nbsp;(<code>dm_effect/0.00125</code>)</li> <li><code>fit_nodip</code>&nbsp;- a directory with calculations related to J (exchange interaction energy), K (single-ion anisotropy energy) fitting --&nbsp;<strong>without</strong>&nbsp;dipolar interaction</li> <li><code>fit_dip</code>&nbsp;- a directory with calculations related to J, K fitting --&nbsp;<strong>with</strong>&nbsp;dipolar interaction,&nbsp;<strong>source of data for plots in the paper</strong></li> </ul> <p><strong>Note</strong>: all directories were archived to .tar.gz files to comply with the file number limit.</p> <h3>MvsB curves</h3> <p>Each directory&nbsp;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 <code>Hsweep/$J/$K/$axis/$T/$H</code>&nbsp;where:</p> <ul> <li><code>$J</code>&nbsp;is the value of exchange interaction energy (in mRy)</li> <li><code>$K</code>&nbsp;is the value of single-ion anisotropy energy (in mRy)</li> <li><code>$axis</code>&nbsp;is the direction of both the external field and the magnetization measurement (either&nbsp;<code>100</code>,&nbsp;<code>210</code>&nbsp;or&nbsp;<code>001</code>)</li> <li><code>$T</code>&nbsp;is the temperature (in Kelvins)</li> <li><code>$H</code>&nbsp;is the strength of the external field (in Teslas)</li> </ul> <p>Each UppASD calculation contains a set of input files (<code>inpsd.dat</code>,&nbsp;<code>posfile</code>,&nbsp;<code>momfile</code>,&nbsp;<code>jfile</code>,&nbsp;<code>kfile</code>) and output files (<code>*.out</code>).</p> <p>Furthermore, files&nbsp;<code>Hsweep/$J/$K/$axis/$T/MvsB.dat</code>&nbsp;contain the data for specific MvsB magnetization curve. Files&nbsp;<code>Hsweep/$J/$K/MvsB-[$axis].png</code>&nbsp;contain plots of MvsB magnetization curves for a specific axis and all available temperatures.</p> <h3>MvsT curves</h3> <p>A similar directory structure exists for calculations necessary for the MvsT curves -&nbsp;<code>Tsweep/$J/$K/$axis/$T</code>&nbsp;where the parameters have the same meaning as in the Hsweep directory.</p> <p>Files&nbsp;<code>Tsweep/$J/$K/$axis/MvsT.dat</code>&nbsp;contain the data for a specific MvsT magnetization curve. Files&nbsp;<code>Tsweep/$J/$K/MvsT.png</code>&nbsp;contain plots of MvsT curves for all available axes.</p> <p><strong>H = 0.1 T for all MvsT measurements</strong>.</p>