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Magnetic properties of metastable Zr - Ni and Hf - Ni alloys around the paramagnetic-ferromagnetic transition

I. Bakonyi, L. F. Kiss

2005enmagnetic propertiesalloysferromagnetismmetastabletransition

Abstract

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A melt-spinning technique was employed to create metastable Zr - Ni and Hf - Ni alloys with compositions near the Ni-rich eutectic, specifically at 89, 90, and 91 at. % Ni content. Depending on the cooling rate and alloy composition, varying phases such as amorphous or body-centered-cubic (bcc) or a nanocrystalline state with a Zr, HfNi5 structure were produced. In this study, we present experimental findings on the low-temperature magnetic properties of these Zr - Ni and Hf - Ni ribbons, where measurements of ac susceptibility, low-field magnetization, and magnetization isotherms were conducted between 5 and 300 K. The Curie points for both amorphous and bcc phases of Zr9Ni91 alloy were observed to be nearly identical at approximately 70 K, while the Curie temperature of the a-Zr10Ni90 alloy was around 42 K; in contrast, the n-Hf11Ni89 alloy remained Pauli paramagnetic down to 5 K. The derived critical concentration of Ni required for the onset of ferromagnetism in these metastable alloys was established at approximately 89.5 at. % Ni. The characteristics and implications of the paramagnetic-ferromagnetic transition were discussed in relation to the electronic density of states at the Fermi level.

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Cite This Work

@article{f78fde48-faa5-47c0-9375-32dcb73574fa,
  title={Magnetic properties of metastable Zr - Ni and Hf - Ni alloys around the paramagnetic-ferromagnetic transition},
  author={I. Bakonyi and L. F. Kiss},
  year={2005},
  language={en}
}
TY  - JOUR
TI  - Magnetic properties of metastable Zr - Ni and Hf - Ni alloys around the paramagnetic-ferromagnetic transition
AU  - I. Bakonyi
AU  - L. F. Kiss
PY  - 2005
LA  - en
ER  -

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