Magnetic irreversibility and metastability in a CuMn alloy

Our magnetic measurements on a CuMn alloy reveal that T_m, the temperature of the susceptibility peak, is marked by a qualitative change in the magnetization-vs.-field behavior. The magnetization process at and above T_m is reversible at all fields, whereas below T_m an irreversibility sets in at a threshold field H₁ and persists up to a second threshold field H₂. The irreversibility results in an isothermal remanence whose saturation value (attained when the field removed exceeds H₂) equals the saturation value of the thermoremanence (attained after cooling from above T_m in a field larger than H₂). Both states of remenence are characterized by a magnetization which is completely reversed by a small reverse field but returns to its original polarity when the field is removed. The hysteresis loop remains thus displaced as long as the cycling field is less than H₁.     

Study of the level scheme of141Pr by (n,n∼' γ) measurements

By means of CO₂-laser radiation electron density profiles of an argon arc device are determined. For the approximation of the measured data a new numerical method envolving Bernstein polynomials has been developed, which facilitates a subsequent analytical treatment of the Abel inversion problem.     

Der Chemische Transport von Mischkristallen im System FeS/MnS/ZnS

Chemical Vapor Transport of Solid Solutions. 7. Chemical Vapor Transport of FeS/MnS/ZnS Mixed Crystals By means of chemical vapor transport using iodine as transport agent (900 → 800 °C) it is possible to prepare in the quasiternary system FeS/MnS/ZnS the mixed crystals (Fe,Mn,Zn)S (sphalerite and wurtzite type), (Fe,Mn)S(ZnS) (NaCl type) and FeS(MnS,ZnS) (NiAs type) in form of single crystals. Based on the composition of these phases the phase diagram for the system FeS/MnS/ZnS at 800 °C was drawn up. The incongruent transport process leads to the accumulation of ZnS in the crystallization zone.     

Der Chemische Transport von Mischkristallen in den Systemen MnS/ZnS,FeS/ZnS und FeS/MnS

Chemical Vapor Transport of Solid Solutions. 5 Chemical Transport of MnS/ZnS, FeS/ZnS, and FeS/MnS Mixed Crystals By means of chemical vapor transport it is possible to prepare in the quasibinary systems MnS/ZnS, FeS/ZnS, and FeS/MnS the mixed crystals (Mn,Zn)S (sphalerite- and wurtzite-type), (Fe,Zn)S (sphalerite- and wurtzite-type), (Fe,Mn)S (NaCl-type), MnS(ZnS) (NaCl-type), FeS(ZnS) and FeS(MnS) (both NiAs-type) in form of single crystals. The experiments harmonize with the phase diagrams. Lattice parameters have been determined.     

Wavelet transformation in damage identification by dynamic tests

The paper presents the problem of damage detection basing on the phenomenon of reflection and diffraction of waves at damage boundaries. Elastic waves in plate structures are considered. Damage is modeled as stiffness reduction at a small domain. One‐dimensional discrete signals, representing the velocity or acceleration measured at specified time and plate sections are analyzed using wavelet transform. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Field-induced magnetic transition in a Cu-Mn spin-glass alloy

The time-independent magnetization of a Cu-Mn alloy (9 at% Mn) as an isothermal function of field is found to describe an S-shaped curve indicative of a field-induced transition. The critical field for the transition decreases to zero as the temperature is raised to that of the susceptibility cusp.