Co-magnetic moment

Curie temperature Tc (Burzo and Lemaire 1992). These Co effective moments are well above the saturation Co magnetic moment and steadily decrease from about 4[Ib... 

Hihara T, Pokrant S and Becker J A 1998 Magnetic moments and chemical bonding in isolated Bi Co clusters Chem. Phys. Lett. 294 357... 

The magnetic moments of the heavy RE elements (Gd, Tb, Dy, etc) are coupled antiparallel to the magnetic moments of the TM elements (Fe, Co, etc). The REj TM alloys are therefore ferrimagnetic below their Curie temperature (T )- The heavy TM moments form one magnetic sublattice and the RE moments the other one. In contrast, the light RE moments (eg, Nd, Pr) couple parallel to the moments of TM. The RE spia is always antiparallel to the TM spia, but for the light RE elements, the orbital momentum is coupled antiparallel to the spia and larger than the spia. 

Magnetic Moments M. Karplus and R. N. Porter, Atoms Molecules (Benjamin/ Cummings Pub. Co, Menlo Park, CA, 1970), p. 544. 

Square planar complexes are also well authenticated if not particularly numerous and include [Co(phthalocyanine)] and [Co(CN)4] as well as [Co(salen)] and complexes with other Schiff bases. These are invariably low-spin with magnetic moments at room temperature in the range 2.1-2.9 BM, indicating 1 unpaired electron. They are primarily of interest because... 

Figure 1. The energy of bcc and hep randoiri alloys and the ])ai tially ordered a phase relative to the energy of the fee phase (a), of the Fe-Co alloy as a function of Co concentration. The corresponding mean magnetic moments are shown in (h). The ASA-LSDA-CPA results are shown as a dashed line for the o ])hase, as a full line for the her ]>hase, as a dot-dashed line for the hep phase, and as a dotted line for the fee phase. The FP-GGA results for pure Fe and Co are shown in (a) by the filled circles (bcc-fcc) and triangles (hep-fee). In (b) experimental mean magnetic moments are shown as open circles (bcc), open scpiares (fee) and open triangles (hep).

The Stoner exchange parameter was chosen so that the magnetic moment behaved similarly to the magnetic moment for the real Fe-Co alloy. These values were, however,... 

Figure 2. The structural energy difference (a) and the magnetic moment (b) as a function of the occupation of the canonical d-band n corresponding to the Fe-Co alloy. The same lines as in Fig. 1 are used for the different structures. In (b) the concentration dependence of the Stoner exchange integral Id used for the spin-polarized canonical d-band model calculations is shown as a thin dashed line with the solid circles. The value of Id for pure Fe and Co, calculated from LSDA and scaled to canonical units, are also shown in (b) as solid squares.

In this section, we compare our results for the magnetic moments of Ni, Fe and Co, n< 55, clusters with available experimental data. We point out that the determination of the exact ground state of these clusters is a very difficult task because these clusters exhibit a number of various spin states with energies lying very close to the ground state and within the range of both the calculational and the experimental errors. 

Figure 1 Orbital magnetic moments for bcc-Fe, fcc-Co and fcc-Ni. The columns denoted by E, K, L and K represent from left to right the experimental data [15] and the theoretical data obtained by the SPR-KKR-, the LMTO-SOC-OP [16] as well as the SOPR-KKR-methods.

Figure 2 Orbital magnetic moments in bcc-Fe Coi-a . The triangles pointing up-and downwards represent the theoretical moments of Fe and Co, respectively, while the concentration weighted sum is given by circles. Full and open symbols stand for results obtained with and without the OP-term included (SOPR- and SPR-KKR-CPA, resp.). Experimental data [15] for the average magnetic moment (bottom) stemming from magneto mechanical and spectroscopic g-factors are given by full squares and diamonds.

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