Wall Structures of Bubble and Stripe Domains in Sputtered Ho-Co Alloy Thin Films Examined by High Voltage Electron Microscopy

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Abstract
Wall structures of stripe and small bubble domains in sputtered Ho x Co100-x alloy films (14≤x≤29) examined by high voltage Lorentz electron microscopy are discussed. A peculiar image which varies locally in contrast and in width along the wall (direction) was found. This variation is thought to be due to the local fluctuation in density of Bloch lines. Two types of wall structures of small bubbles of a diameter less than a few thousand Å are discussed. The magnetization distribution for Type 1 is similar to a vortex, and that for Type 2 is different from that reported by Grundy et al.