Abstract

We have successfully prepared Sr-ferrite dot arrays with perpendicular magnetic anisotropy by electron beam lithography. Virgin magnetic configurations detected by magnetic force microscopy (MFM) show single domain configuration for a 0.5 μm dot, while multidomain configurations are found for larger dots. The magnetization reversal mechanism in dots larger than 0.5 μm is found to be domain wall motion. While the magnetization reversal mechanism in 0.5 μm dots is found to be magnetization rotation. A normalized dc demagnetization remanence curve (DCD) measured by a superconducting quantum interference device (SQUID) indicates that with a decrease of dot size, the DCD curve is approaching the curve predicted by the coherent rotation model. Both MFM and SQUID results indicate that the single-domain dots reversed individually free from interdot magnetostatic coupling.

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