Magnetic and Mössbauer Spectral Properties of DyFe₁₁Ti and DyFe ₁₁TiH

Abstract

The temperature dependence of the AC magnetic susceptibility, between 4.2 and 300 K, and the magnetization, between 300 and 600 K, has been measured for DyFe11Ti and DyFe11TiH. Iron-57 Mössbauer spectral measurements between 4.2 and 295 K have also been carried out on DyFe 11Ti and DyFe11TiH and analyzed with a model which considers both the direction of the magnetization in the different magnetic phases of these compounds and the distribution of titanium atoms in the near-neighbor environment of the three crystallographically distinct iron sites. The magnetic measurements and the Mössbauer spectra of DyFe 11Ti clearly show the influence of the two spin reorientations occurring in this compound and indicate that the iron magnetic moments are oriented along the [1 0 0] direction of the basal plane below 100 K. The magnetic measurements and the Mössbauer spectra of DyFe11TiH do not show any evidence for spin reorientations and are consistent with a basal magnetic anisotropy between 4.2 and 600 K. Hence, the hydrogen insertion into DyFe11Ti reinforces the dysprosium magnetic anisotropy. The assignment and the temperature dependencies of the Mössbauer spectral hyperfine fields and isomer shifts are in full agreement with a Wigner-Seitz cell analysis of the three iron sites in DyFe11Ti and DyFe 11TiH.

Department(s)

Chemistry

Keywords and Phrases

Crystallography; Isomers; Magnetic Anisotropy; Magnetic Moments; Magnetization; Mössbauer Spectroscopy; Magnetic Phases; Dysprosium Compounds; Magnetic Susceptibility; Mössbauer Spectra; Rare Earth Compounds

International Standard Serial Number (ISSN)

0304-8853

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 Elsevier, All rights reserved.

Publication Date

01 Sep 2003

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