Abstract

Tetragonal ThMn 12-type single crystalline ErFe 11Ti and HoFe 11Ti samples have been investigated by magnetization measurements and by observations of the magnetic domain structure at various temperatures between 10 and 300 K. The magnetic structure of ErFe 11Ti changes from room temperature “easy axis” ( c-axis) type to conical at spin-reorientation temperature T SR = 5 0 K . The HoFe 11Ti has a metastable anisotropy energy minimum in the a-direction at T < 4 0 K . It leads to a first-order magnetization process detected by magnetization measurements along the a-axis in this temperature region.

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