Ultra-high coercivity of (Fe86-xNbxB14)(0.88)Tb-0.12 bulk nanocrystalline magnets

作者：Chrobak A^*; Ziolkowski G; Randrianantoandro N; Klimontko J; Chrobak D; Prusik K; Rak J

来源：Acta Materialia, 2015, 98: 318-326.

DOI：10.1016/j.actamat.2015.07.056

• Hard magnets
• Micromagnetism
• Magnetic domains
• Biphase magnetic systems

The paper refers to hard magnetic properties of (Fe86-xNbxB14)(0.88)Tb-0.12 bulk nanocrystalline magnets prepared using the vacuum mold suction technique. A combination of a specific chemical composition and sample preparation technology leads to a formation of dendrite grains of Tb2Fe14B hard magnetic phase. The microstructure of the obtained alloys strongly depends on both these factors. The examined alloys reveal high and ultra-high coercivity exceeding 7 T at room temperature. It was shown that the observed magnetic hardening is caused by the shape of the dendrite grains with sub-micro branches as a source of additional exchange anisotropy. Favorable hard magnetic properties occur for the alloy with 6 at.% of Nb content which corresponds to the maximum of activation enthalpy of Fe crystallization in amorphous Fe86-xNbxB14 basic alloys.

• 出版日期2015-10-1