Magnetic Properties of the Hf₁₋ₓRₓFe₆Ge₆ (R = Gd and Dy) Compounds

Abstract

We present a study of the magnetic properties and the57Fe Mössbauer spectra of the Hf1-xFe6Ge6, R = Gd and Dy, series. The macroscopic magnetic measurements are consistent with the magnetic independence of the R and Fe sublattices. However, the57Fe Mössbauer study reveals a more complex magnetic behavior. Specifically, below Tt ≈ 100 K a spin reorientation takes place in HfFe6Ge6. The analysis of the corresponding Mössbauer spectra shows that below Tt a fraction of the iron moments is canted from the c-axis. The substitution of Hf by Gd or Dy reduces the fraction of canted iron moments. The hyperfine magnetic fields are found to decrease upon the R = Gd or Dy substitution. This effect can be qualitatively explained as a result of the decrease in the hybridization between the d valence states of the R element with the 3d iron states.

Department(s)

Chemistry

Keywords and Phrases

Hyperfine Magnetic Fields; Magnetic Behavior; Magnetic Measurements; Spin Reorientation; Ssbauer Spectroscopy; Sub-lattices; Valence State; Dysprosium Compounds; Gadolinium; Germanium; Hafnium; Magnetic Devices; Magnetic Fields; Magnetic Properties; Molybdenum; Molybdenum Compounds; Magnetic Materials

International Standard Serial Number (ISSN)

0018-9464

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Nov 2008

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