Abstract
The magnetic ordering of polycrystalline Mo2NiB2-type Tb2Co2Ga and Tb2Co2Al-based Sm2-xTbxCo2Al, Tb2Co2Al1-xGax and Tb2Co1.8{Ni, Cu}0.2Al solid solutions has been established using bulk magnetic measurements. These compounds undergo a high-temperature ferromagnetic ordering and field sensitive transformation of magnetic ordering at low temperatures. The high-temperature ferromagnetic ordering is followed via negative magnetic entropy change and soft magnet properties, whereas low-temperature transformation of magnetic ordering indicates positive magnetic entropy change and excellent permanent magnet properties.
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