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 Fe3_3O4_4 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 Fe$_3$O$_4$. 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