  Here we show that the zero point energy associated to the quantum spin
fluctuations of a non- collinear spin texture produce Casimir-like magnetic
fields. We study the effect of these Casimir fields on the topologically
protected non-collinear spin textures known as skyrmions. We calculate the zero
point energy, to the lowest order in the spin wave expansion, in a Heisenberg
model with Dzyalonshinkii-Moriya interactions chosen so that the classical
ground state displays skyrmion textures, that disappear upon application of a
strong enough magnetic field. Our calculations show that the Casimir magnetic
field contributes a 10 percent of the total Zeeman energy necessary to delete
the skyrmion texture with an applied field, and is thereby an observable
effect.
