Article Sidebar

Submitted
Apr 25, 2017
Published
Jun 1, 2006
Download
PDF
Statistic
Read Counter : 341 Download : 203

Main Article Content

Abstract

The low temperature specific heat of the magnetic Dy0.40Cu0.37Y0.23 amorphous alloy have been investigated in the temperature range 2 to 50 K. The magnetic contributions to the specific heat, magnetic entropy changes, ordering temperatures and the effective magnetic spin have been estimated for this magnetic amorphous alloy. The magnetic specific heat show broad anomaly at a certain temperature, Tm of about 28 K. The value of Tm is higher than Tf (=23.5 K) determined from low field ac susceptibility measurements. The magnetic entropy changes between 0 K and Tm are estimated to be 84 %  of the maximum theoretical value. The behaviors of this amorphous alloy agree quit well with those of condensed rare earth amorphous systems.

 

 

Keywords

Specific Heat Amorphous Alloys Dysprosium Amorphous Alloys.

Article Details

References

  1. COEY J. M.D. 1978. Amorphous Magnetic Order. J. Appl. Phys.49: 1646-1652.
  2. DEL MORAL A., ARNAUDAS J.J. and MOHAMMED K.A. 1986. Spin Glass Parameter of RE-Cu-Y Alloys (RE=Rare Earth). Solid State Commun.58: 395-398.
  3. GAROCHE P., FERT A., VEYSSIE J.J. and BOUCHER B. 1980. Specific Heat of Rare Earth Amorphous Alloys. J. Magn. Magn. Mater. Vol. 15-18:1397-1398.
  4. HARRIS R., PLISCHKE M. and ZUCKERMANN M.J. 1979. New Model for Amorphous Magnetism. Phys. Rev. Lett. 31: 160-162.
  5. HATTORI H., FUKAMICHI K., SUZUKI K., ARUGA-KATORI H. and GOTO T. 1995. Spin-glass-like Behaviour and Low-temperature Specific Heat of Amorphous ErxNi1-x Random Magnetic Anisotropy System. J. Phys. : Condens. Matter. 7: 4193-4205.
  6. LANCHESTER P.C. and MOHAMMED K.A. 1985. Apparatus For Heat Capacity Measurements of Amorphous Metals. J. Phys. E : Sci. Instrum.18: 581.
  7. LIEBERMANN H. and GRAHAM, C., Jr 1976. Production of Amorphous Alloy Ribbons and Effect Apparatus Parameters on Ribbon Dimensions. IEEE Trans. Magn. 12: 921-923.
  8. LOUNASMAA O.V. and SUNDSTROM L.J. 1966. Specific Heat of Gadolinium, Terbium, Dysprosium, Holmium and Thulium Metals between 3 and 25 K. Phys. Rev. 150: 399-412.
  9. MOHAMMED K.A. and LANCHESTER P.C. 1986. The Low Temperature Specific Heat of Gd-Cu-Y Metallic Glasses. J. Magn. Magn. Mater. 60: 275-284.
  10. MOHAMMED K.A. and LANCHESTER P.C. 1987. The Low Temperature Specific Heat of Lu-Cu-Y Metallic Glasses. J. Magn. Magn. Mater. 65: 15-20.
  11. MOHAMMED K.A. 1994. The Low Temperature Specific Heat and Spin Glass Ordering Temperature of RExCu1-x, RExAg1-x AND RExA11-x Metallic Glasses. J. Edu. and Sci. 22: 57-63.
  12. MOHAMMED K.A. 1998. The Specific Heat and AC Susceptibility of Tb- Metallic Glasses. Raf. Jour. Sci. 9: 84-89.
  13. MOHAMMED K.A. 2002. THE Specific Heat and ac Susceptibility of Gd.33Cu.67 Metallic Glass. J. Abhath AL-Yarmouk : “Pure Sci. & Eng.” 11: 183-191.
  14. RAINFORD B.D., SAMADIAN V., BEGUM R.J., LEE E.W. and BURKE S.K. 1982. Crystal Field Splittings in Dilute Amorphous Rare Earth Alloys. J. Appl. Phys. 53: 7725-7727.