Abstract
Using special microwave structures, strong spin precessions can be excited locally in LPE garnet films by microwaves near the ferrimagnetic resonance frequency. As soon as the precession angle θ exceeds a critical value, the spins tip over creating a bubble domain. If the bubble is small compared with the excitation region, it is ejected out of this region along a spiral path. In the other case, the bubble is trapped at the excitation region and reaching another critical value of θ the spins again tip over, creating a ring domain. Single-ring domains can only be stabilized by the microwave induced spin precession inside the ring. Amplitude modulation of the microwaves leads to a corresponding radial oscillation of the ring. Stripe domains are forced to align either parallel or perpendicular to the gradient of the spin precession. At high bias fields a new type of domain is observed.
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