heat generation loss calculation

[yuheon lee]

Hi everyone,

I am currently conducting research on the thermal effects caused by Barkhausen jumps using Mumax3 simulations.While I can successfully output various energy terms (such as Zeeman, exchange, and demagnetization energies) through the simulation, I am looking for a way to directly quantify or derive the heat generation rate (or energy dissipation) from these results. Specifically, I would like to know:

- Is there a built-in function or a recommended script to calculate the total energy dissipation (dE/dt) during a magnetization process? 

- If I want to correlate the energy loss from Barkhausen jumps with local heating, which output parameters would be most reliable to use as a basis for heat quantity? 

I would appreciate any advice, example scripts, or references to similar studies using Mumax3 for thermal analysis.Thank you for your time and help.

[Josh Lauzier]

Hi,

There is no built in function, but you can save each energy or the total energy by adding them to the table with TableAdd() and TableAutosave(). You can also save the full spatial-dependent data into an OVF using save() or autosave()

For your second question, I do not have much experience so I can't answer for sure. In the literature, I have seen people analyzing the area of the hysteresis loops as an estimate of hysteretic losses. This paper uses oommf/Vinamax (a fork of mumax more suited for nanoparticles on long timescales) instead of mumax, but perhaps you might find it useful as a start: https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.18.034034

Cheers,
Josh L.