Magnetic properties of nanocrystalline Fe, Ni(Fe) and Fe(Si) alloys

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Abstract

Results on magnetic properties of nanocrystalline pure Fe, Ni, and Fe(Si) alloys obtained in our Laboratory [1,2,3] are summarized. The grain size of powders, prod ced by ball-milling, was determined from X-ray line broadening and was 6-12 nm after about 350 hours of milling. The magnetic properties were studied by Barkhausen noise measurements technique and conventional magnetometry. The coercivity, Hc, determined from the Barkhausen-noise curves for both Fe and Ni-15%Fe showed an increasing tendency with decreasing grain size, d. This is accordance with the domain wall pinning at grain boundaries for which a 1/d law is expected. In case of Ni-15%Fe alloy a sharp decrease of Hc was observed at grain size below 20 nm which is the first experimental verification of the random anisotropy model for nanocrystalline solid solutions. Well detectable changes in the Mössbauer spectra were observed due to the grain boundaries at small grain sizes, and from the hyperfine magnetic field it was concluded that the average magnetization of nanocrystalline Fe is about 98% of the bulk value. This is in good agreement with our results obtained from the direct saturation magnetization measurements for both Fe and Ni(Fe) alloy.

Original languageEnglish
Pages (from-to)701-706
Number of pages6
JournalMaterials Science Forum
Volume225-227
Issue numberPART 2
Publication statusPublished - 1996

Fingerprint

Magnetic properties
grain size
magnetic properties
Grain boundaries
grain boundaries
Domain walls
Ball milling
Saturation magnetization
Coercive force
Powders
magnetization
Solid solutions
Magnetization
Anisotropy
noise measurement
Magnetic fields
magnetic measurement
coercivity
domain wall
balls

Keywords

  • Barkhausen Noise
  • Magnetic Properties
  • Mössbauer-Effect
  • Nanocrystalline Materials

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Magnetic properties of nanocrystalline Fe, Ni(Fe) and Fe(Si) alloys. / Beke, D.

In: Materials Science Forum, Vol. 225-227, No. PART 2, 1996, p. 701-706.

Research output: Contribution to journalArticle

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abstract = "Results on magnetic properties of nanocrystalline pure Fe, Ni, and Fe(Si) alloys obtained in our Laboratory [1,2,3] are summarized. The grain size of powders, prod ced by ball-milling, was determined from X-ray line broadening and was 6-12 nm after about 350 hours of milling. The magnetic properties were studied by Barkhausen noise measurements technique and conventional magnetometry. The coercivity, Hc, determined from the Barkhausen-noise curves for both Fe and Ni-15{\%}Fe showed an increasing tendency with decreasing grain size, d. This is accordance with the domain wall pinning at grain boundaries for which a 1/d law is expected. In case of Ni-15{\%}Fe alloy a sharp decrease of Hc was observed at grain size below 20 nm which is the first experimental verification of the random anisotropy model for nanocrystalline solid solutions. Well detectable changes in the M{\"o}ssbauer spectra were observed due to the grain boundaries at small grain sizes, and from the hyperfine magnetic field it was concluded that the average magnetization of nanocrystalline Fe is about 98{\%} of the bulk value. This is in good agreement with our results obtained from the direct saturation magnetization measurements for both Fe and Ni(Fe) alloy.",
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AB - Results on magnetic properties of nanocrystalline pure Fe, Ni, and Fe(Si) alloys obtained in our Laboratory [1,2,3] are summarized. The grain size of powders, prod ced by ball-milling, was determined from X-ray line broadening and was 6-12 nm after about 350 hours of milling. The magnetic properties were studied by Barkhausen noise measurements technique and conventional magnetometry. The coercivity, Hc, determined from the Barkhausen-noise curves for both Fe and Ni-15%Fe showed an increasing tendency with decreasing grain size, d. This is accordance with the domain wall pinning at grain boundaries for which a 1/d law is expected. In case of Ni-15%Fe alloy a sharp decrease of Hc was observed at grain size below 20 nm which is the first experimental verification of the random anisotropy model for nanocrystalline solid solutions. Well detectable changes in the Mössbauer spectra were observed due to the grain boundaries at small grain sizes, and from the hyperfine magnetic field it was concluded that the average magnetization of nanocrystalline Fe is about 98% of the bulk value. This is in good agreement with our results obtained from the direct saturation magnetization measurements for both Fe and Ni(Fe) alloy.

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