Partner User Proposal Abstract
Implementation of low-temperature magnetic imaging using photoemission electron microscopy at 4-ID-C (PUP-44)
In this proposal, we describe a program that takes a slightly different structure than a typical PUP, but nevertheless seeks to create a new facility and a new user community at the APS. We propose to develop low-temperature magnetic imaging using the photoemission electron microscopy (PEEM) station on 4-ID-C. The work will take place in two phases. In the first year, we will upgrade the PEEM station with a cryogenic sample stage for imaging down to at least 90K with nitrogen cooling, with an ultimate goal of 30-40K with helium. In conjunction with this work, we will work to improve the spatial resolution of the PEEM from its current 100 nm to at least 50 nm, using the new refocusing optics and the imaging energy filter. In the second year, following commissioning of these upgrades, we will begin imaging studies on several complex, multielement systems with collaborative partners in order to build a new user community for low temperature imaging. These efforts will bring the APS PEEM to a competitive level with other instruments in the world, will redirect the PEEM program towards low temperature imaging of this exciting class of materials, and will couple it more closely with highly successful ongoing spectroscopy studies at 4-ID-C. We request reliable access to beamtime, outside of the PEEM’s normal user operations, to test and commission these upgrades, to push the spatial resolution to a more competitive level, and to begin imaging studies on the programs outlined below. By the end of this period, the low-temperature imaging capabilities will become available to general users of 4-ID-C.
