Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Thin Films Tuesday Sessions
       Session TF-TuM

Invited Paper TF-TuM1
Looking Below the Surface with Photoemission: Standing Waves and Hard X-rays

Tuesday, December 9, 2014, 8:00 am, Room Makai

Session: Interfaces in Multilayers & Nanocomposites
Presenter: Charles Fadley, University of California at Davis, USA
Correspondent: Click to Email
I will present some new directions in soft x-ray photoemission (XPS, SXPS) and hard x-ray photoemission (HXPS, HAXPES, HIKE) [1-5], with illustrative examples of applications to a range of sample types. These involve combined SXPS and HXPS studies of buried layers and interfaces in magnetic and transition-metal oxide multilayers [1], as well as semiconductor junctions [2]; solid-gas or solid-liquid interfaces with high ambient pressures [4,5]; and the use of standing waves from multilayer mirrors to enhance depth contrast in spectroscopy [1,3,4,5].

References

This work was supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, the Army Research Office, under MURI Grant W911-NF-09-1-0398, the Forschungszentrum Julich, Peter Grunberg Institute (PGI-6), and the LABEX-PALM, APTCOM project of Le Triangle de Physique, Paris.

[1] “Interface properties of magnetic tunnel junction La0.7Sr0.3MnO3/SrTiO3 superlattices studied by standing-wave excited photoemission spectroscopy”, A. X. Gray et al., Phys. Rev. B 82, 205116 (2010); and A.X. Gray et al., Europhysics Letters 104, 17004 (2013).

[2] Nondestructive characterization of a TiN metal gate: chemical and structural properties by means of standing-wave hard x-ray photoemission spectroscopy”, C. Papp, G. Conti, et al. J. Appl. Phys. 112, 114501 (2012).

[3] “Hard X-ray Photoemission with Angular Resolution and Standing-Wave Excitation”, C. S. Fadley, invited review, J. Electron Spectrosc. 190, 165-179 (2013)

[4] “Some future perspectives in soft- and hard- x-ray photoemission”, C.S. Fadley and S. S. Nemšák, invited review for a special issue of the Journal of Electron Spectroscopy dedicated to Structure Determination and Wave-Function Analysis, H. Daimon, A. Hishikawa, and C. Miron, Editors, available online at: http://authors.elsevier.com/sd/article/S036820481400139X .

[5] “Chemical-state resolved concentration profiles with sub-nm accuracy at solid/gas and solid/liquid interfaces using standing-wave ambient-pressure photoemission (SWAPPS)”, S. Nemsak et al., submitted.