AMIX MAG: Difference between revisions
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{{TAGDEF|AMIX_MAG|[real]|1.6}} | {{DISPLAYTITLE:AMIX_MAG}} | ||
{{TAGDEF|AMIX_MAG|[real]|1.6}}{{DISPLAYTITLE:AMIX_MAG}} | |||
Description: {{TAG|AMIX_MAG}} linear mixing parameter for the magnetization density. | Description: {{TAG|AMIX_MAG}} linear mixing parameter for the magnetization density. | ||
---- | ---- | ||
The default mixing parameters for spinpolarized calculations are: | |||
:{{TAG|IMIX}}=4, {{TAG|AMIX}}=0.4, {{TAG|AMIN}}=min(0.1,{{TAG|AMIX}},{{TAG|AMIX_MAG}}), {{TAG|BMIX}}=1.0, {{TAG|AMIX_MAG}}=1.6, and {{TAG|BMIX_MAG}}=1.0. | |||
== Related | These settings are consistent with an (initial) spin enhancement factor of 4, which is usually a reasonable approximation. | ||
There are only a few other parameter combinations that can be tried if convergence turns out to be very slow. In particular, for slabs, magnetic systems, and insulating systems (e.g. molecules and clusters), an initial "linear mixing" can result in faster convergence than the Kerker model function.{{cite|kerker:prb:1981}} One can therefore try to use the following setting | |||
{{TAGBL|AMIX}} = 0.2 | |||
{{TAGBL|BMIX}} = 0.0001 ! almost zero, but 0 will crash some versions | |||
AMIX_MAG = 0.8 | |||
{{TAGBL|BMIX_MAG}} = 0.0001 ! almost zero, but 0 will crash some versions | |||
'''Mind''': For spinpolarized calculations the defaults for the mixing parameters {{TAG|AMIX}} and {{TAG|BMIX}} are different than for the non-spinpolarized case. | |||
== Related tags and articles == | |||
{{TAG|IMIX}}, | {{TAG|IMIX}}, | ||
{{TAG|INIMIX}}, | {{TAG|INIMIX}}, | ||
| Line 14: | Line 28: | ||
{{TAG|MIXPRE}}, | {{TAG|MIXPRE}}, | ||
{{TAG|WC}} | {{TAG|WC}} | ||
{{sc|AMIX_MAG|Examples|Examples that use this tag}} | |||
== References == | |||
---- | ---- | ||
[[Category:INCAR]][[Category: | [[Category:INCAR tag]][[Category:Electronic minimization]][[Category:Density mixing]][[Category:Magnetism]] | ||
Latest revision as of 08:19, 20 October 2023
AMIX_MAG = [real]
Default: AMIX_MAG = 1.6
Description: AMIX_MAG linear mixing parameter for the magnetization density.
The default mixing parameters for spinpolarized calculations are:
These settings are consistent with an (initial) spin enhancement factor of 4, which is usually a reasonable approximation.
There are only a few other parameter combinations that can be tried if convergence turns out to be very slow. In particular, for slabs, magnetic systems, and insulating systems (e.g. molecules and clusters), an initial "linear mixing" can result in faster convergence than the Kerker model function.[1] One can therefore try to use the following setting
AMIX = 0.2 BMIX = 0.0001 ! almost zero, but 0 will crash some versions AMIX_MAG = 0.8 BMIX_MAG = 0.0001 ! almost zero, but 0 will crash some versions
Mind: For spinpolarized calculations the defaults for the mixing parameters AMIX and BMIX are different than for the non-spinpolarized case.
Related tags and articles
IMIX, INIMIX, MAXMIX, AMIX, BMIX, BMIX_MAG, AMIN, MIXPRE, WC