^p^pof;
Materials;
Science;
and;
Engineering,;
Norwegian;
University;
of;
Science;
and;
Technology;
(NTNU),;
NO-7491,;
Trondheim,;
Norway;
^pof;
Physics;
of;
Advanced;
Materials,;
Ufa;
State;
Aviation;
Technical;
University,;
Ufa;
450000,;
Russia;