Magnetostriction of Co80−xTxB20 (T = Fe, Mn, Cr, or V) glasses

Abstract

The low temperature specific heat of the metallic glasses (FexNi80−x)B20 heat of the metallic glasses Magnetostriction measurements as a function of temperature and composition are reported in non-crystalline Coso_,T,B 2o alloys (T = Fe, Mn, Cr or V with 0::; x::; 12 at. %). The room temperature saturation magnetostriction ..t , changes sign with the substitution of Fe, Mn or Cr for Co in CosoB,o glass. These results are well described by the virtual-bound-states jVBSs) introduced above the 3d band by the light T solutes. The positions of 3d' (3d majority spin) VBS with respect to the Fermi energy is established. The magnetostrictions of ConMnsB,o and C070CrlOB20 glasses (negative at 295 K) also change sign with increasing temperature. This is the first direct observation of magnetostriction-compensation temperatures in non-crystalline metals. The existence of these magnetostriction compensation temperatures is interpreted to be a consequence of the different temperature dependences of single-ion and two-ion contributions to..t ,.

Magnetic and anisotropy studies in amorphous Co80−xHoxB20 alloys

“…2 and with the help of Eq. (1), the value of m Co is calculated, for x ¼ 0; to be equal to 1.25 m B , which agrees well with the results published [9][10][11]. It is known that with the addition of RE metal, the MT moment decreases due to hybridization of the 5d and 3d orbitals.…”

Co-rich magnetic amorphous films and their application in magnetoelectronics

“…The short electron meanfree path of the order of interatomic distances implies that the electrical transport behavior appears to probe the details of the local environment in the films preferentially over other long-range properties. Moreover, as is well established, the Co-based glasses are strong ferromagnets with minority spin holes only, 14,15 suggesting an exceptionally high spin polarization. The substitution of the other 3d-transition metals, Fe and Ni, increases the magnetic moment and decreases the magnetostriction ͑ϳ10 −6 ͒.…”

“…% metalloid. For similar amorphous alloys ͑Co 1−x Fe x ͒ 80 B 20 , O'Handley et al 14 introduced a modified split-band model to interpret the changes in magnetic moment M s and saturation magnetostriction with substitution of the second 3d-transition metal Fe. In this model, the majority-spin 3d ↑ states remain below the Fermi level until M s reaches a maximum and -passing through zero- changes its sign.…”

Magnetic Moment and Electronic Structure of Amorphous Alloys of the Type Fe80-xTMxB20

“…Analysis of the data within the framework of Friedel's model was made for the amorphous Co80 -xTMx B20 alloys with TM = Fe, Mn, Cr, V by O'Handley [3,4] and for the amorphous (Fe100-xTMx)79P13B8 alloys with TM = Mn, Cr, V by Durand [5,6]. We report here concentration dependence of the magnetic moment for the amorphous Fe-based alloys with boron as the only metalloid.…”