Pressure dependence of magnetic properties in Fe-Mn-B amorphous alloys

Evidence for inhomogeneous ferromagnetism

L. F. Kiss, T. Kemény, J. Bednarčík, J. Kamarád, Z. Arnold, Z. Konôpková, H. P. Liermann

Research output: Contribution to journalArticle

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Abstract

The pressure dependence of the saturation magnetization and Curie temperature was studied in melt-spun Fe60Mn20B 20, Fe56Mn24B20 and Fe 75B25 amorphous alloys up to 0.9 GPa, corresponding to volume changes up to 0.45%. In addition, in situ high-pressure (up to 40 GPa) x-ray diffraction was performed to determine the compressibility of the latter two alloys. Both the Curie temperature TC (at atmospheric pressure TC = 201 ± 3 and 159 ± 3 K) and the low-temperature saturation magnetization M5 K,5 T decrease remarkably with increasing pressure: dTC/dp =- 31 ± 0.5 and -32 ± 5 K GPa -1 and dlnM5 K,5 T/dp =- 0.15 ± 0.02 and -0.13 ± 0.03 GPa-1 for xMn = 20 and 24 at.%, respectively. Compared to dlnM5 K,5 T/dp =- 0.016 ± 0.003 GPa-1 measured for Fe75B25, the pressure dependence of M5 K,5 T is one order of magnitude larger in the ternary alloys. The bulk moduli for the Fe56Mn24B 20 and Fe75B25 glasses were measured to be 152 GPa and 173 GPa, respectively. These data are also compared with the pressure dependence of the hyperfine field and theoretical calculations of the saturation moment for Fe-B alloys reported in the literature. The results were interpreted within an inhomogeneous itinerant-electron model of ferromagnetism.

Original languageEnglish
Article number346002
JournalJournal of Physics Condensed Matter
Volume25
Issue number34
DOIs
Publication statusPublished - Aug 28 2013

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Ferromagnetism
Amorphous alloys
pressure dependence
ferromagnetism
Magnetic properties
magnetic properties
saturation
Curie temperature
Saturation magnetization
magnetization
ternary alloys
bulk modulus
compressibility
atmospheric pressure
x ray diffraction
Ternary alloys
moments
Compressibility
glass
Atmospheric pressure

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Pressure dependence of magnetic properties in Fe-Mn-B amorphous alloys : Evidence for inhomogeneous ferromagnetism. / Kiss, L. F.; Kemény, T.; Bednarčík, J.; Kamarád, J.; Arnold, Z.; Konôpková, Z.; Liermann, H. P.

In: Journal of Physics Condensed Matter, Vol. 25, No. 34, 346002, 28.08.2013.

Research output: Contribution to journalArticle

Kiss, L. F. ; Kemény, T. ; Bednarčík, J. ; Kamarád, J. ; Arnold, Z. ; Konôpková, Z. ; Liermann, H. P. / Pressure dependence of magnetic properties in Fe-Mn-B amorphous alloys : Evidence for inhomogeneous ferromagnetism. In: Journal of Physics Condensed Matter. 2013 ; Vol. 25, No. 34.
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AB - The pressure dependence of the saturation magnetization and Curie temperature was studied in melt-spun Fe60Mn20B 20, Fe56Mn24B20 and Fe 75B25 amorphous alloys up to 0.9 GPa, corresponding to volume changes up to 0.45%. In addition, in situ high-pressure (up to 40 GPa) x-ray diffraction was performed to determine the compressibility of the latter two alloys. Both the Curie temperature TC (at atmospheric pressure TC = 201 ± 3 and 159 ± 3 K) and the low-temperature saturation magnetization M5 K,5 T decrease remarkably with increasing pressure: dTC/dp =- 31 ± 0.5 and -32 ± 5 K GPa -1 and dlnM5 K,5 T/dp =- 0.15 ± 0.02 and -0.13 ± 0.03 GPa-1 for xMn = 20 and 24 at.%, respectively. Compared to dlnM5 K,5 T/dp =- 0.016 ± 0.003 GPa-1 measured for Fe75B25, the pressure dependence of M5 K,5 T is one order of magnitude larger in the ternary alloys. The bulk moduli for the Fe56Mn24B 20 and Fe75B25 glasses were measured to be 152 GPa and 173 GPa, respectively. These data are also compared with the pressure dependence of the hyperfine field and theoretical calculations of the saturation moment for Fe-B alloys reported in the literature. The results were interpreted within an inhomogeneous itinerant-electron model of ferromagnetism.

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