Low-temperature coercivity of Mo2NiB2-type Tb2Co2Ga and Tb2Co2Al-based solid solutions.

The magnetic ordering of polycrystalline Mo 2 NiB 2 -type Tb 2 Co 2 Ga and Tb 2 Co 2 Al-based Sm 2-x Tb x Co 2 Al, Tb 2 Co 2 Al 1-x Ga x and Tb 2 Co 1.8 {Ni, Cu} 0.2 Al 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. The magnetic ordering of polycrystalline Mo 2 NiB 2 -type Tb 2 Co 2 Ga and Tb 2 Co 2 Al-based Sm 2-x Tb x Co 2 Al, Tb 2 Co 2 Al 1-x Ga x and Tb 2 Co 1.8 {Ni, Cu} 0.2 Al 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. Image 1 • Tb 2 Co 2 Ga and Tb 2 Co 2 Al-based solutions show high-temperature ferromagnetic ordering. • This HT ferromagnetic ordering corresponds to the negative ΔS m and soft magnet properties. • They exhibits low-temperature field sensitive transformation of magnetic ordering. • This LT transformation is followed positive ΔS m and permanent magnet properties. • Tb 2 Co 2 Ga is giant permanent magnet with H coer of 48 kOe and (BH) max of 1068 kJ/m3 at 2 K. [ABSTRACT FROM AUTHOR]