Abstract
An avalanche photodiode detector has been commissioned to measure weakresonant x-ray magnetic scattering (RXMS) from induced magnetic polarizationsin Cu layers in exchange-coupled Co/Cu multilayers using circularly polarizedx-rays from synchrotron sources. The detector can count x-rays at rates of107 photons s−1, giving good estimates of the RXMS at superlattice Bragg peaks in areasonably short time when count losses due to the time structure of thesynchrotron x-rays are corrected for. RXMS superlattice Bragg peaks as small as1 × 10−4 in flipping ratio have been measured from a Co/Cu multilayer at the K absorption edge ofCu. The data are fitted by an oscillatory model magnetization profile in the Cu layersderived from a Ruderman–Kittel–Kasuya–Yosida theory of exchange coupling adapted to aplanar geometry.
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