97,574 research outputs found
Early stages of mechanical crystallization of amorphous FeZrBCu soft magnetic material
No full textEarly stages of mechanical crystallization of amorphous FeZrBCu soft magnetic material / J. Friedrich, U. Herr, K. Samwer. – In: Journal of applied physics. 87. 2000. S. 2464-246
Reply to Comment on ‘Disentangling interatomic repulsion and anharmonicity in the viscosity and fragility of glasses’
Get PDFIn this Reply, we discuss the differences between physical parameters used in the derivation of the Krausser-Samwer-Zaccone model of viscosity and those used in the justification of the empirical power-density scaling for repulsive power-law fluids. These fundamental differences preclude a direct combination of the two approaches
Nonlinear response and avalanche behavior in metallic glasses
No full textThe response to different stress amplitudes at temperatures below the glass transition temperature is analyzed by mechanical oscillatory excitation of Pd40Ni40P20 metallic glass samples in single cantilever bending geometry. While low amplitude oscillatory excitations are commonly used in mechanical spectroscopy to probe the relaxation spectrum, in this work the response to comparably high amplitudes is investigated. The strain response of the material is well below the critical yield stress even for highest stress amplitudes, implying the expectation of a linear relation between stress and strain according to Hooke's Law. However, a deviation from the linear behavior is evident, which is analyzed in terms of temperature dependence and influence of the applied stress amplitude by two different approaches of evaluation. The nonlinear approach is based on a nonlinear expansion of the stress-strain-relation, assuming an intrinsic nonlinear character of the shear or elastic modulus. The degree of nonlinearity is extracted by a period-by-period Fourier-analysis and connected to nonlinear coefficients, describing the intensity of nonlinearity at the fundamental and higher harmonic frequencies. The characteristic timescale to adapt to a significant change in stress amplitude in terms of a recovery timescale to a steady state value is connected to the structural relaxation time of the material, suggesting a connection between the observed nonlinearity and primary relaxation processes. The second approach of evaluation is termed the incremental analysis and relates the observed response behavior to avalanches, which occur due to the activation and correlation of local microstructural rearrangements. These rearrangements are connected with shear transformation zones and correspond to localized plastic events, which are superimposed on the linear response behavior of the material
Hall effect in superconducting Nb/Cu multilayers
No full textHall effect in superconducting Nb/Cu multilayers / K. Samwer ... - In: Physica. C. 235-240. 1994. S. 2565 f
Anisotropy of the mixed-state resistance of Tl2Ba2CaCu2O8 single crystals
No full textAnisotropy of the mixed-state resistance of Tl2Ba2CaCu2O8 single crystals / K. Samwer ... - In: Annalen der Physik. 509. 1997. 6. S. 167-17
Thermal expansion measurements of glass-forming alloys in the melt and the undercooled state under microgravity conditions
No full textThermal expansion measurements of glass-forming alloys in the melt and the undercooled state under microgravity conditions / B. Damaschke, K. Samwer. – In: Applied physics letters. 75. 1999. S. 2220-222
Phase formation and thermal stability of mechanical alloyed iron–tantalum
No full textPhase formation and thermal stability of mechanical alloyed iron–tantalum / K. Samwer ... - In: Journal of applied physics. 85. 1999. S. 3512-351
Nanocrystalline cubic yttria
No full textNanocrystalline cubic yttria : synthesis and optical properties / K. Samwer ... - In: Chemical vapor deposition. 5. 1999. S. 207-21
Giant magnetoresistance and interlayer coupling in Cu(111)/Ag67Co33 granular multilayers
No full textGiant magnetoresistance and interlayer coupling in Cu(111)/Ag67Co33 granular multilayers / K. Samwer ... - In: Journal of applied physics. 81. 1997. S. 4589- 459
Chemical vapor synthesis and luminescence properties of nanocrystalline cubic Y2O3:Eu
No full textChemical vapor synthesis and luminescence properties of nanocrystalline cubic Y2O3:Eu / K. Samwer ... - In: Journal of applied physics. 86. 1999. S. 3129-313
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