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Magnetic Moment and Spin Glass Behavior of AlCuMn and AlPdMn Quasicrystalline and Amorphous Alloys((B)Quasicrystals)

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In the present review, the effective magnetic moment, the magnetic Mn atom ratio, partial substitution of TM and the spin glass behavior of AlCuMn, AlPdMn and AlMn quasicrystalline and amorphous alloys are discussed. Distinct differences in the magnetic properties between quasicrystalline and amorphous states have been confirmed in AlCuMn and AlPdMn alloy systems in contrast with those in AlMn alloys. The effective magnetic moments of AlCuMn and AlPdMn quasicrystalline alloys are smaller than those of amorphous counterparts, but much larger than those of AlMn alloys in the same concentration range. The ratios of magnetic Mn atoms in AlCuMn and AlPdMn quasicrystalline alloys are about one half that of the amorphous counterparts, although there is no essential distinction in AlMn alloy systems. The spin glass behavior has been confirmed in AlCuMn amorphous alloys and AlPdMn quasicrystalline and amorphous alloys even below 15 %Mn, although AlMn alloys exhibit the spin glass behavior above 20 %Mn. These differences mentioned above can be explained by considering the difference in the forming ability of the localized magnetic moment among three alloy systems and in the local structure between the quasicrystalline and amorphous states. It should be noted that Al_<70>Pd_<15>Mn_<15> quasicrystalline alloy has a giant magnetic moment in analogy with PdMn crystalline dilute alloys.

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