Magnetic properties of Fe76X2B22 (X=Cr,Zr,Nb) amorphous alloys

Structural Relaxation in Fe78Nb2B20Amorphous Alloy Studied by Mössbauer Spectroscopy

“…2 allow concluding that the observed optimization effect cannot be attributed to iron nanostructure. The significant increase of permeability is due to annealing out of free volume and a reduction of internal stresses, as it was discussed in [6][7][8][9][10][11][12].…”

“…Such a microstructure averages out magnetic anisotropy and gives an enhancement of magnetic permeability. However, as it was shown at first time in [6] in some alloys the optimization effect can be observed without formation of iron nanograins and can be attributed to annealing out of free volume (frozen into material during fabrication) and a reduction of internal stresses [6][7][8][9][10][11][12]. This effect is especially interesting because it allows obtaining very good soft magnets free of embrittlement -the main disadvantage -of nanostructured magnets.…”

Optimization of soft magnetic properties and crystallization in FeAgNbSiB, FeAgNbB and FeAgCoNbB amorphous alloys

“…Indeed as it was shown in [21][22][23][24][25][26][27] a significant increase of permeability observed in samples free of iron nanograins was attributed to annealing out of free volume and a reduction of internal stresses, i.e. to the so-called relaxed amorphous phase.…”

Crystallization in Fe76X2B22 (X=Cr, Zr, Nb) amorphous alloys

“…Amorphous and nanocrystalline alloys based on iron obtained by melt spinning technique form one of the most widely studied group of modern soft magnetic materials [1][2][3][4][5][6][7][8]. These alloys are usually used as precursors of nanocrystalline materials for which soft magnetic properties are found to be superior to those of the conventional materials.…”

“…It is already known that the crystallization (nanocrystallization) kinetic strongly depends on chemical composition [1,8,9]. Different alloying additions (like Cr, Zr and Nb or metalloids as B or Si) can drastically change the crystallization temperatures and soft magnetic properties of the material as well [4,5]. A typical procedure of obtaining nanocrystalline soft magnetic materials from melt spinning precursors consists in annealing amorphous alloys at temperatures close to the crystallization temperature i.e.…”