Abstract
We are studying the effect that illumination by coherent resonant x-rays may have on magnetic domain memory (MDM) in a [Co / Pd] / IrMn multilayers [1-3]. MDM is the ability of the magnetic domains to retain their exact same domain topology upon field cycling. Earlier studies have suggested that under higher doses of x-ray illumination, the material may lose its existing MDM. To investigate this possible effect we have used both x-ray resonant magnetic scattering (XRMS) along with magneto-transport measurements [4,5] to track the exchange bias while the sample is illuminated with x-rays, as illustrated in Figure 1. Fig.1a shows magneto-transport data collected on the [Co/Pd] / IrMn multilayer from which we hope to extract information about exchange bias. A loss of exchange bias would indicate that the x-rays illumination dose may alter the strength of the internal exchange couplings between the ferromagnetic and antiferromagnetic layers. Ultimately it would alter the amount of MDM, which is measured via XRMS as illustrated in Fig. 1b, and represented in a correlation map such as Fig.1c.
Published Version
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