Abstract
The possible existence of the spin glass (SG) state in the (Cr84Re16)99.6Mn0.4 alloy was investigated using magnetisation measurements. The temperature dependence of magnetisation, M(T), indicated a splitting of the M(T) data in the zero-field-cooled (ZFC) and field-cooled (FC) curves at the pinning temperature, Tp which is an indication of magnetic anisotropy in the system. The (Cr84Re16)99.6Mn0.4 alloy showed time dependence of isothermal remanent magnetisation (IRM) measurements, which is a signature associated with canonical SG. Measurement of field dependence of magnetisation did not show saturation at the lowest temperature or highest magnetic field because of the lack of long-range magnetic ordering which is also a SG signature. Preliminary measurements indicate the possible existence of magnetic frustration leading to the SG state in the (Cr84Re16)99.6Mn0.4 alloy.
Highlights
The spin glass (SG) state observed in Cr100−wMnw alloys differs from conventional SG as Tp is independent of Mn concentration and magnetic susceptibility, χ, is independent of temperature between Tp and Néel temperature, TN.5
The diffraction patterns are all well matched to the X-ray diffraction (XRD) reference code (04-008-5187) of bcc Cr in the standard Joint Committee of Powder Diffraction Standard Database (JCPDD)11 confirming it as the predominant phase
Magnetic properties of the (Cr84Re16)99.6Mn0.4 alloy were measured in order to probe the presence of the SG state
Summary
Magnetic properties of Cr alloys are interesting to the experimentalist as the unique spin-density-wave (SDW) antiferromagnetism (AF) of Cr is significantly altered by adding small quantities of diluents. The electron concentration, related to the number of conduction electrons per atom (e/a) of the impurities of SDW Cr alloys, has a strong effect on the magnetic properties of Cr alloys. A dopant, such as Mn, which has (e/a) higher than that of pure Cr will result in expansion of the electron sheet on the Fermi surface (FS) of pure Cr which leads to more perfect nesting of electron and hole sheets upon SDW formation and magnetic ordering.. The electron concentration, related to the number of conduction electrons per atom (e/a) of the impurities of SDW Cr alloys, has a strong effect on the magnetic properties of Cr alloys.. The magnetically frustrated spin glass state (SG) has been detected in alloys of Cr containing Mn.. The SG state observed in Cr100−wMnw alloys differs from conventional SG as Tp is independent of Mn concentration and magnetic susceptibility, χ, is independent of temperature between Tp and Néel temperature, TN.. The study of the (Cr84Re16)99.6Mn0.4 alloy was chosen to understand the nature of the magnetic state when Re and Mn, both electron donors, are used as dopants. The magnetic properties of the (Cr84Re16)99.6Mn0.4 alloy showed signatures resembling those observed in SG systems. This paper reports on the magnetisation results of the (Cr84Re16)99.6Mn0.4 alloy
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