Wall Energy and Exchange Stiffness in CoCr Films Sputtered on Low Temperature Substrates

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Abstract
In CoCr films sputtered on polyimide substrates with 27°C, the stripe domains and the wall motion could be observed clearly using the Bitter method. The behaviour of the domains and the magnetic properties, the saturation magnetization M s, Curie temperature T c and the anisotropy energy K u were investigated as a function of Cr-content. Due to the dilution effect, the values of M s, T c and K u decrease with increasing Cr-content. The wall energy density and the exchange stiffness change with M s 2, namely they decrease with Cr-content, while the wall width is about 210 Å independent of Cr-content.