Curie Temperature of Disordered Alloys

PRESSURE EFFECT ON CURIE TEMPERATURE FOR Co1-xBx AMORPHOUS ALLOYS

Pressure effect on Curie temperature, dTc/dp, for amorphous Col-,B, alloys is estimated indirectly from forced volume magnetostriction even in Tc > Tcry. Results estimated indirectly show smaller values compared with those measured directly, and are consistent with thermal expansion. The value of dTc/dp extrapolated to Co agrees with that for crystalline Co.

Effect of thermal expansion, electronic excitations, and disorder on the Curie temperature of Ni1-xCuxMnSb alloys

We demonstrate the importance of thermal effects such as temperature-induced electronic, magnetic and vibrational excitations, as well as structural defects in the first-principles calculations of the magnetic critical temperature of complex alloys using half-Heusler Ni 1−x Cu x MnSb alloys as a case study. The thermal lattice expansion and one-electron excitations have been accounted for self-...

Curie temperature of multiphase nanostructures

MAGNETIC PERMEABILITY AFTEREFFECT IN FeNiSiB AMORPHOUS ALLOYS NEAR THE CURIE TEMPERATURE

The temperature dependence of the magnetic aftereffect, ABIB, has been investigated between room temperature and T, in two low-T, FeNiSiB amorphous alloys. ABIB is observed to steadily decrease with T in a region near T,, where the magnetic permeability stays almost constant. The results are analysed in terms of the structural model for the aftereffect. Introduction sive technique [I]. The samp...

Oscillatory curie temperature of two-dimensional ferromagnets.

The effective exchange interactions of magnetic overlayers Fe/Cu(001) and Co/Cu(001) covered by a Cu-cap layer of varying thickness were calculated in real space from first principles. The effective two-dimensional Heisenberg Hamiltonian was constructed and used to estimate magnon dispersion laws, spin-wave stiffness constants, and overlayer Curie temperatures within the mean-field and random-p...