Chapter 4 Magnetism and processing of permanent magnet materials

Magnetic and Mössbauer spectral study of ErFe11Ti and ErFe11TiH

“…ErFe 11 Ti has been synthesized in a water cooled copper crucible by melting 99.95% pure elements in a highfrequency induction furnace. A high homogeneity was achieved by annealing the sample at 1200 K for 10 days.…”

“…This series of intermetallic compounds offers two main advantages as hard magnetic materials; first, a high iron content which yields a high magnetization and, second, a relatively high Curie temperature, especially for the titanium containing compounds. Hence, a good deal of attention has been devoted to these tetragonal compounds [5][6][7] and, because of its excellent properties, SmFe 11 Ti has been identified as potentially the most promising compound. [8][9][10] In general, the insertion of light elements, such as hydrogen, carbon, or nitrogen, into the structure of a rare-earth transition metal intermetallic compound has a dramatic and beneficial effect upon the compound's magnetic properties.…”

“…[8][9][10] In general, the insertion of light elements, such as hydrogen, carbon, or nitrogen, into the structure of a rare-earth transition metal intermetallic compound has a dramatic and beneficial effect upon the compound's magnetic properties. 11 Indeed, the insertion of interstitial elements into the RFe 11 Ti compounds leads to large changes in their structural and magnetic properties. 8,9,[12][13][14][15] ErFe 11 Ti, as well as several other RFe 11 Ti compounds, 16 -18 exhibit a spin reorientation at low temperature, a spin reorientation which has been extensively studied.…”

“…11 Indeed, the insertion of interstitial elements into the RFe 11 Ti compounds leads to large changes in their structural and magnetic properties. 8,9,[12][13][14][15] ErFe 11 Ti, as well as several other RFe 11 Ti compounds, 16 -18 exhibit a spin reorientation at low temperature, a spin reorientation which has been extensively studied. 10,[19][20][21][22][23] The influence of interstitial hydrogen on the magnetocrystalline anisotropy of ErFe 11 Ti has also been reported 21 earlier.…”

“…8,9,[12][13][14][15] ErFe 11 Ti, as well as several other RFe 11 Ti compounds, 16 -18 exhibit a spin reorientation at low temperature, a spin reorientation which has been extensively studied. 10,[19][20][21][22][23] The influence of interstitial hydrogen on the magnetocrystalline anisotropy of ErFe 11 Ti has also been reported 21 earlier. Herein, we investigate the influence of the insertion of hydrogen into the crystal lattice of ErFe 11 Ti upon its spin reorientation and, more specifically, the iron sublattices by combining macroscopic isothermal magnetization and ac susceptibility measurements with microscopic iron-57 Möss-bauer spectral measurements.…”