Abstract

We examine the consequences for magnetism of icosahedral site symmetry and of long-range icosahedral ordering as found in quasicrystals. Enhanced magnetic moments and Curie temperatures can result from icosahedral site symmetry. Exceptionally low magnetic anisotropy, unusual domain walls, and extremely soft magnetic behavior are predicted for long-range icosahedrally ordered magnets. Preliminary magnetic data on rapidly solidified, metastable icosahedral magnetic phases based on Co-Er(-Si) and Co-Nb(-B) are reviewed and discussed in terms of their chemical short-range order.

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