Abstract
Experimental results of ac susceptibility, dc magnetization, magnetic relaxation,and specific heat measurements on a well annealed polycrystalline UFe4Al8sample establish that this compound is a long-range magnetic exchangeinteraction-dominated ferromagnet (Curie temperature TC = 138 K)with strong magnetic anisotropy. The typical metastable magneticcharacteristics—the irreversibility of the temperature dependence of themagnetization and the long-time magnetic relaxation behaviour at lowtemperatures—mainly result from domain wall pinning effects. The downshift ofthe ac susceptibility peak position with increasing frequency suggests that theeffect of the spin-glass state, if it exists at all, is rather weak in this system.
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