Nanostructured surfaces

UNUSUAL MAGNETORESISTANE CHANGES OF THIN DEUTERIUM-COVERED W(100) PLATE UNDER HIGH-TEMPERATURE ANNEALING
Bordeniuk I.V, Sologub S.V.
Department of Adsorption Phenomena, Institute of Physics of the NAS of Ukraine. Prospect Nauki, 46, Kyiv-03028, Ukraine. 
E-mail: ibordeniuk@gmail.com

Changes of the magnetoresistance (MR) of thin (~100 m) W(100) plates covered with saturated deuterium coverage at Т = 4.2 K during isochronous (~1 s) annealing were examined by static skin-effect and transversal magnetoresistance techniques. MR changes due to modification of specularity of surface scattering of conduction electrons by submonolayer deuterium desorption/ordering (Fig. 1, Т = 5 – 800 К) [1] and unusual, partially reversible, MR changes of the plate with atomically clean surfaces at annealing temperatures T = 1250 – 2650 К (Fig. 1) were found.

Fig. 1. Change of the MR of the W(100) plate covered by deuterium at T  5 K due to isochronous annealing.

Reasons of the unexpected high-temperature effect, in particular, the deuterium-induced change of surface and bulk structure of tungsten plates caused by high-temperature “flashes” and penetration of deuterium into the subsurface area of tungsten, are discussed.

1.	Sologub S.V., Bordeniuk I.V., Amirov R.H., Petrova N.V., Yakovkin I.N., Scattering of conduction electrons on the W(001) surface covered with the ordered deuterium monolayer // Surf. Sci.- 2019.- 685.- P. 13-19.