Circularly polarised magnetic field

[dovod91]

Hello team,

I am trying to replicate the H-field inside a gyrotropic medium and so, I am struggling to define a circularly polarised magnetic field for spin wave excitation in a stripe. The field must be a sinc. Diving through the API, I cannot find code related to serve my purpose (maybe it is just me not looking well into it!).
So far, I was thinking on defining two zeeman fields, one in quadrature with the first, but I don't know how to write this in ubermag ...

Something starting with system.energy += mm.Zeeman(H=(1,1,1), name='Hsinc_circ_pol', func=H_circ_pol, dt=dt_)...
Then I defined H_circ_pol as a time-dependent function of a circularly polarized wave:

`def H_circ_pol(t):

t_0 = 20*dt_
freq = 20e9
sinc_bw = 1/ (5*dt_)

omega = 2 * np.pi * freq

H0 = 1

envelope = np.sinc(sinc_bw * (t - t_0))

handedness = 'left'

# Field components
if handedness == 'right':
    Hx = H0 * envelope * np.cos(omega * t)
    Hy = H0 * envelope * np.sin(omega * t)
elif handedness == 'left':
    Hx = H0 * envelope * np.cos(omega * t)
    Hy = -H0 * envelope * np.sin(omega * t)
else:
    raise ValueError("handedness must be 'right' or 'left'")

Hz = np.zeros_like(t)
return np.stack((Hx, Hy, Hz), axis=-1)`

But this prompts a runtime rror in oommf... Any suggestions on how to implement this idea?
Many thanks for your help!!
Cheers,