642 research outputs found
Isolation of Peaks in TDS Spectra of Deuterium from Ion Irradiated Tungsten
AbstractInteraction of deuterium with radiation defects in tungsten was studied by means of thermal desorption spectroscopy. The displacement damage in a recrystallized tungsten foil was produced by irradiation with 10 keV/D ions to the fluences in the range of 3–8×1019 D/m2 at room temperature. The resulted thermal desorption spectra consisted of three wide overlapping peaks. It was shown that annealing of the damaged sample at 550 K and subsequent implantation with 0.67 keV/D ions allows to isolate the peak corresponding to deuterium release from vacancies
Laser-driven 1st order spin reorientation and Verwey phase transitions in the magnetite FeO beyond the range of thermodynamic equilibrium
Ultrafast photo-induced phase transitions occurring under the impact of
femtosecond laser pulses provide versatile opportunities to switch solids
between distinctly-different crystalline, electronic, and spin states and thus
modify their functional properties in a significant manner. In this paper, we
report on the laser-induced spin reorientation and Verwey phase transitions in
a ferrimagnetic single crystalline magnetite FeO. Using femtosecond
optical and magneto-optical pump-probe techniques, we define the range of
initial sample temperatures and laser fluences when partial or complete
photo-induced phase transitions occur from a monoclinic insulating to a cubic
metallic state with concomitant switching of magnetic anisotropy from the
uniaxial to the cubic one. We thus reveal a connection between these phase
transitions when driven by femtosecond laser pulses. Using transient linear and
quadratic magneto-optical effects, we examine magnetization dynamics launched
by the magnetic anisotropy axis switching, and unveil the presence of the
domains undergoing the laser-induced phase transitions even below the
established thershold fluence for the transitions, as well as when the material
is initially in the cubic phase. This is the manifestation of the 1st order of
these laser-induced phase transitions beyond the range of thermodynamic
equilibrium.Comment: 9 pages, 5 figure, 1 supplemental materia
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