Magnetic bubbles with different wall states in a (110) oriented garnet film

Abstract

In a (110) oriented (YTmBi)3(FeGa)5O12 garnet film with orthorhombic anisotropy, bubbles with different wall states were carefully studied using the bubble rocking method. Eight different bubble states have been identified, each belonging to a family of either large or small bubbles and coexisting at the same bias field. Each family is represented by elliptical S = 1,0,−1 and circular S = 0 bubbles. All bubbles have roughly the same mobility, whereas the static collapse fields differ as much as 6.1 Oe. Under all experimental conditions so far, we observed no conversion from small to large bubbles or vice versa, which indicates a remarkable stability of the two bubble families observed.