1,720,998 research outputs found
MOKE experiments and theory of uniform and nonuniform distribution of magnetic nanoscrystals: Mn(5)Ge(3) in Ge
No full textMagnetooptical study of Mn ions implanted in Ge
No full textThe effect of ion-implanted manganese impurities in germanium is investigated by means of the Kerr effect rotation. annealing, a magnetic cycle with a coercive field 3000 Oe is observed at about 10 K. The hysteresis disappears just, below room temperature. The magnetic analysis, supported by structural characterization, suggests that particles rich in Mn are formed within the Ge matrix during implantation
Magnetic response of Mn-doped amorphous porous Ge fabricated by ion-implantation
No full textGe substrates of (100) orientation were irradiated with 100 keV Mn ions (2 x 10(16) at./CM2) at a temperature of 190 degrees C. Pronounced swelling of the irradiated material up to 150 nm, associated with the formation of a Mn-doped amorphous porous Ge layer, is investigated by scanning electron microscopy and X-ray photoelectron depth profiling. Magneto-optical Kerr effect hysteresis loops have been used to characterize the magnetic properties of the obtained sample. The details of the hysteresis loops reveal that the ferromagnetic property of the sample up to similar to 20 K and the subsequent strong non-linear paramagnetic response must be ascribed to Mn atoms dispersed in the amorphous porous implanted layer. (c) 2007 Elsevier B.V. All rights reserved
Static magnetic field effect on the Fremy’s salt–ascorbic acid chemical reaction studied by continuous-wave electrom paramagnetic resonance
No full textStatic magnetic field effect in the framework of the radial pair mechanism (RPM) theory was studied on the biologically significant chemical reaction between ascorbic acid and Fremy’s salt. The data indicate that the reaction rate depends on the applied magnetic field strength. The time scale of the studied reaction and the improved continuous-wave electron paramagnetic resonance system allowed for the first time the direct comparison of the amplitude differences between exposed and control samples in the strictly same boundary conditions. Until now the RPM was studied in a different time scale, focusing only on faster reactions by time-resolved techniques or by spectrophotometer measurement. The magnetic field effects presently measured can not be extended tout court to living systems; however the understanding of magnetic field sensitivity in basic chemical reaction in vitro could help clarifying the underlying basic step of interaction between magnetic fields and biological systems
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Magneto-optical characterization of MnxGe1-x alloys obtained by ion implantation
No full textMagneto-optical Kerr effect hysteresis loops at various wavelengths in the visible/near-infrared range have been used to characterize the magnetic properties of alloys obtained by implanting Mn ions at fixed energy in a Ge matrix. The details of the hysteresis loops reveal the presence of multiple magnetic contributions. They may be attributed to the inhomogeneous distribution of the magnetic atoms and, in particular, to the known coexistence of diluted Mn in the Ge matrix and metallic Mn-rich nanoparticles embedded in it [Phys. Rev. B 73 ( 2006) 195207]. (c) 2006 Elsevier B.V. All rights reserved
Magnetization of epitaxial MnGe alloys on Ge(111) substrates
No full textThe structural and magnetic properties of an Mn rich solid phase epitaxy MnxGe1-x alloy grown on a clean 2 x 8-Ge(111) surface, with a Curie temperature of about 300 K are investigated. Magneto-optical Kerr effect infers the existence of in-plane easy magnetization direction. We describe the epitaxial registry condition, the room temperature-zero field magnetic structure observed by magnetic force microscopy and the magneto-optical properties. The observations are consistent with the formation of epitaxial Mn5Ge3 alloy, with a modulated magnetic structure characterized by asymmetric 180degrees Bloch walls consisting of a vortex-like configuration of the local magnetization. (C) 2005 Elsevier B.V. All rights reserved
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