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Indeed, I had looked into that to simulate the full system. However, to lighten up the CPU/memory load, I have been trying to fit only the S = 1/2 ground state, which I coupled to the three nuclear spins. (I suppose my code is valid for that approach?) As a second step, I will be looking into fittin...

And it works!

Thanks a lot, I'll be tuned in for the bug fix.

Thank you for the reply and sorry for the delay in responding. I must have misunderstood the way matrices are built, as I built the g tensor matrix in analogy to the hyperfine tensor matrix I posted at http://easyspin.org/forum/viewtopic.php?f=3&t=260. So, in my current script I understood that ...

Thanks for pointing this out! A copy-paste error crept through. Now I corrected my data and my code is: clear all; close all; cm=2.99793e4; % Conversion constant from cm-1 to MHz (~ 100*clight/1e6) path = '/home/thanasis/magnet/Natassa/Fe3O/Ph_py_NG471/'; cd(path); [T,chi] = textread('data_easyspin....

Thanks for this info! My script is the following: clear all; close all; cm=2.99793e4; % Conversion constant from cm-1 to MHz (~ 100*clight/1e6) path = '/home/path/to/file/'; cd(path); [T,chi] = textread('data_easyspin.dat','%f %f'); format long; % added as per your suggestion J = -22; gxy = 2; gz = ...

OK, probably I found my error, but please do confirm:

In my fitting code I changed to: ...and...
and then the three hyperfines are fitted as one.

OK, as per http://easyspin.org/easyspin/documentation/userguide_fitting.html#customfunction, I have defined the function constrain.m as follows: function y = constrain(Sys1,Exp,Opt); fullSys = Sys1; fullSys.A = [Sys1.A; Sys1.A; Sys1.A]; fullSys.Nucs = 'Cu,Cu,Cu'; [x,y] = pepper(fullSys,Exp,Opt); ret...

Thanks for the pointers!

I will look into them.

Please find attached the data file.
First column T (in K), second column chi (in emu).

All T and chi values are consistently rounded to 4 decimals.

EDIT 1: txt, dat and csv extensions are not allowed in attachments, so I will try to PM it to you
EDIT 2: Data PM'd as straight text

I have searched Easyspin's documentation and examples, but I haven't seen any implementations of fitting SQUID data with easyspin (only simulations). So, I have a few questions: 1. using the textread function as described in http://easyspin.org/easyspin/documentation/importexport.html, the '%g %g' a...