Structural and magnetic investigation of gradually devitrified Nanoperm alloys

S. S. Modak, N. Ghodke, F. Mazaleyrat, M. Lo Bue, L. Varga, A. Gupta, S. N. Kane

Research output: Contribution to journalArticle

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Abstract

Time and temperature evolution of structural and magnetic properties of gradually devitrified NANOPERM-type alloy of composition Fe84Nb3.5Zr3.5B8Cu1 has been studied using differential scanning calirometery (DSC), X-ray diffraction (XRD), Mössbauer spectroscopy and magnetic measurements. XRD and Mössbauer measurements reveal that thermal annealing (as a function of both time and temperature)-induced nanocrystallization leads to the formation of an Fe-rich bcc phase with a small amount of boron, while other non-magnetic elements like Nb, Zr and majority of B remain in the residual amorphous matrix. Grain diameter of the nanocrystalline phase ranges between 7 and 10 nm and their volume fraction ranges between 15% and 48%. Increase of annealing temperature as well as time affects the coercive field considerably. The lowest value of the coercive field, 6 Am-1 (corresponding saturation magnetization value is 1.4 T), is obtained after annealing the sample at 530 °C for 1 h, ascribed to the increased exchange coupling between the nanograins.

Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume320
Issue number20
DOIs
Publication statusPublished - Oct 2008

Fingerprint

Annealing
annealing
Nanocrystallization
X ray diffraction
Exchange coupling
Boron
Magnetic variables measurement
Saturation magnetization
diffraction
Temperature
magnetic measurement
temperature
Structural properties
Volume fraction
Magnetic properties
boron
x rays
Spectroscopy
magnetic properties
Scanning

Keywords

  • DSC
  • Magnetic measurements
  • Mössbauer spectroscopy
  • XRD

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Structural and magnetic investigation of gradually devitrified Nanoperm alloys. / Modak, S. S.; Ghodke, N.; Mazaleyrat, F.; Lo Bue, M.; Varga, L.; Gupta, A.; Kane, S. N.

In: Journal of Magnetism and Magnetic Materials, Vol. 320, No. 20, 10.2008.

Research output: Contribution to journalArticle

Modak, S. S. ; Ghodke, N. ; Mazaleyrat, F. ; Lo Bue, M. ; Varga, L. ; Gupta, A. ; Kane, S. N. / Structural and magnetic investigation of gradually devitrified Nanoperm alloys. In: Journal of Magnetism and Magnetic Materials. 2008 ; Vol. 320, No. 20.
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