Abstract
Different chemical and/or geometrical orders were found in melt-spun DyMn6 − xGe6 − xFexAlx with x = 2.5 and 3 having fully amorphous and mixed (crystalline and amorphous) structure, respectively. Thermal variations in magnetization M from liquid helium up to room temperature for both samples are similar. Magnetization value at zero field cooled curve reaches about 0.1 μB per formula unit at 2 K and then increases. Two maxima are visible, the first at 50 K (a sharp effect) and the second very broad ranging from 150 to 200 K. 57Fe Mossbauer spectrometry investigation revealed a remaining magnetic component in addition to a prevailing quadrupolar feature. Application of a weak external magnetic field causes an increase in the mean hyperfine magnetic field Bhyp and the volume fraction of magnetic component. This observation was confirmed by results of M(T), M(H) and AC magnetic susceptibility measurements. In short-range ordered crystallographic zones characteristic of melt-spun DyMn6 − xGe6 − xFexAlx (x = 2.5, 3) alloys, the related magnetic ordering, called the mictomagnetism or the cluster spin glass appears.
Highlights
The intermetallic compounds DyMn6−xGe6−xAlxFex with limiting compositions x = 0 (DyMn6Ge6) and x = 6 (DyFe6Al6) crystallize in hexagonal and tetragonalB
Lattice distortions or disorder connected with metastability of the material structure play an important role both when the ground state is magnetic or not
The spin glass ordering is characterized by a cusp in the magnetic susceptibility as a function of temperature observed at the freezing temperature T f
Summary
The plethora of magnetic states characteristic of amorphous structures, includes the spin glass-type states. The spin glass ordering is characterized by a cusp in the magnetic susceptibility as a function of temperature observed at the freezing temperature T f .
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