TY - JOUR
T1 - Electronic structure and magnetism of amorphous Co1-xBx alloys
AU - Tanaka, Hiroshi
AU - Takayama, Shinji
AU - Hasegawa, Mineshi
AU - Fukunaga, Toshiharu
AU - Mizutani, Uichiro
AU - Fujita, Asaya
AU - Fukamichi, Kazuaki
PY - 1993
Y1 - 1993
N2 - The electronic structure of amorphous Co1-xBx (x=0.17, 0.23, and 0.32) alloys were calculated to clarify their magnetism and electronic specific heat. The electronic structures were calculated self-consistently, both in the spin-polarized and paramagnetic states, by employing the most-localized linear muffin-tin orbital method together with the recursion method. B s and p states split into bonding and antibonding states, and B p states, in particular, hybridize with the tails of Co d states. The exchange splitting of Co d states decreases with increasing B content mainly because of the enhancement of the hybridization. As a result, amorphous Co-B alloys become less ferromagnetic as their B content increases. The calculated magnetic moments per Co atom are proportional to the exchange splitting of Co d states, and decrease with increasing B content. They can be satisfactorily explained by the generalized Stoner model, and agree quantitatively with the experimental data. The density of states at the Fermi level rises with increasing B content, because the highest peak of the minority Co d states shifts toward the Fermi level owing to the decrease in the exchange splitting. This explains a gradual increase in the electronic specific coefficient observed in the experiment.
AB - The electronic structure of amorphous Co1-xBx (x=0.17, 0.23, and 0.32) alloys were calculated to clarify their magnetism and electronic specific heat. The electronic structures were calculated self-consistently, both in the spin-polarized and paramagnetic states, by employing the most-localized linear muffin-tin orbital method together with the recursion method. B s and p states split into bonding and antibonding states, and B p states, in particular, hybridize with the tails of Co d states. The exchange splitting of Co d states decreases with increasing B content mainly because of the enhancement of the hybridization. As a result, amorphous Co-B alloys become less ferromagnetic as their B content increases. The calculated magnetic moments per Co atom are proportional to the exchange splitting of Co d states, and decrease with increasing B content. They can be satisfactorily explained by the generalized Stoner model, and agree quantitatively with the experimental data. The density of states at the Fermi level rises with increasing B content, because the highest peak of the minority Co d states shifts toward the Fermi level owing to the decrease in the exchange splitting. This explains a gradual increase in the electronic specific coefficient observed in the experiment.
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U2 - 10.1103/PhysRevB.47.2671
DO - 10.1103/PhysRevB.47.2671
M3 - Article
AN - SCOPUS:25944460389
VL - 47
SP - 2671
EP - 2677
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 5
ER -