Re: Paramagnetic particles

[Jean-Noël Grad]

Hi!

Deniz Mostarac has implemented a feature called "dipole fields" in the 
python branch of ESPResSo that might help you. The algorithm evaluates 
for every particle the total magnetic field generated by all other 
particles, including periodic images of the central particle. You can 
find an example in the file `testsuite/python/dipole_field_tracking.py`. 
It requires the DIPOLE_FIELD_TRACKING feature in the myconfig.hpp file. 
Please note dipole fields don't include contributions from external 
fields, such as `espressomd.constraints.HomogeneousMagneticField`, and 
are only calculated by the dipolar direct sum solver on CPU.

More details can be found in the following entries of the user manual:
https://espressomd.github.io/doc/espressomd.html#espressomd.particle_data.ParticleHandle.dip_fld
https://espressomd.github.io/doc/espressomd.html#espressomd.observables.ParticleDipoleFields
https://espressomd.github.io/doc/magnetostatics.html#dipolar-direct-sum

Best regards,
JN

On 11/19/24 22:51, Guillermo Camacho wrote:
> Hello everyone!
>
> I am Guillermo Camacho, a PhD student from the University of Granada, 
> Spain. I am trying to simulate paramagnetic particles using espresso. 
> That is, particles whose dipole moment depends exclusively on the 
> external magnetic field and the local field generated by nearby particles.
>
> As far as I konw, this is not possible in the current espresso version. 
> Do you know if it is possible to do it, or has anyone by any chance 
> implemented some kind of paramagnetic dipolar interaction?
>
> Thanks in advance.
>
> Best regards,
>
> Guillermo