Abstract by Colby Walker

Personal Infomation

Presenter's Name

Colby Walker

Degree Level



Mason Parkes
David Keavney
Eric Fullerton
Karine Chesnel

Abstract Infomation


Physics and Astronomy

Faculty Advisor

Karine Chesnel


The effect of x-ray illumination on magnetic domain memory in [Co/Pd] / IrMn multilayers]


We are studying the effect that illumination by coherent x-rays may have on magnetic domain memory (MDM) in a [Co / Pd] / IrMn multilayers. 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 dose of x-ray illumination, the material may lose its existing MDM. To investigate this potential effect, we have used both x-ray resonant magnetic scattering (XRMS) along with magneto-transport measurements to track the exchange bias while the sample is illuminated with x-rays. Magneto-transport is here used to measure the hysteresis loop of our multilayers material from which we can measure the exchange bias and its possible alteration. A loss of exchange bias indicates that the x-rays illumination dose may alter the strength of local exchange couplings and ultimately the amount of MDM. Knowing if a loss of exchange bias has occurred requires collecting magneto-transport data as well as XRMS data and correlating the observed changes under various dose of x-ray illumination.