The Effect of Size Distribution on the Switching Field Distribution of Co/Pd Multilayered Nanostructure Arrays
HOUSTON UNIV TX CENTER FOR NANOMAGNETIC SYSTEMS
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We use Ion Beam Proximity Lithography IBPL to produce 4mm x 4mm arrays of 220 nm dots in perpendicularly-oriented CoPd multilayered media. IBPL is used to reduce the size distribution sigmaD of the arrays, and subsequently He ion irradiation is used to reduce their anisotropy. The Switching Field Distribution sigmaHcrHCr is measured for each sample before and after irradiation, and a linear relationship is experimentally found between sigmaHcrHCr and sigmaD. We argue that the slope of the line is due to the self-demagnetization effect of individual dots and therefore, it is not strictly a line and that the intercept of the line is inversely proportional to the permeability of the nanostructured material.
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