defining region in FMR simulation

[sukh...@gmail.com]

Hi All,

I am using mumax to calculate dispersion relation (nr. 5) with the link below:

https://colab.research.google.com/github/JeroenMulkers/mumax3-tutorial/blob/master/postprocessing.ipynb#scrollTo=Pi8qUMmO0s7w

This mumax3 script simulates a uniformly magnetized nanowire with an applied field perpendicular to the wire. Spin waves are excited by a sinc pulse with a maximum frequency of 20GHz at the center of the simulation box.

I am confused with the code below where region is defined:

defregion(1, rect(2*{dx}, inf))

B_ext.setregion(1, vector(0.01 * sinc( 2*pi*{fmax}*(t-{T}/2)), 0, {Bz}))

How is this region defined? Is this region excludes the initial two cells along the length?

Why do we need to define the region?

What if I do simulation without region like below?

// defregion(1, rect(2*{dx}, inf))

B_ext = vector(0.01 * sinc( 2*pi*{fmax}*(t-{T}/2)), 0, {Bz})

Could anyone please explain me this.

Best regards

Sukhvinder Singh

[Felipe Garcia]

Hi,

The example is to excite spin waves, which are excited from that region. If one wants to study the FMR, it is not necessary to use regions.

Best regards,

Felipe

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