TY - JOUR
T1 - Magnetic Properties of Amorphous Fe-Nd Alloys
AU - Nagayama, Katsuhisa
AU - Ino, Hiromitsu
PY - 1990
Y1 - 1990
N2 - Melt-spun amorphous Fe1-xNdx alloys (0.11≦x≦0.60) were investigated by the magnetization measurement up to 143 kOe and the Mössbauer spectroscopy. The coercive field at 4.2 K increases abruptly at around x=0.30 with increasing x, amounting to 53 kOe at x=0.40. The hyperfine field of 57Fe at 77 K is independent of x and about 300 kOe on an average, suggesting that the magnetic moment of Fe is about 2.0μB/atom throughout this system. On this assumption and the measured magnetization at 4.2 K, it is estimated that the average Nd moment is about 3.2 μB/atom at the low x limit. This value corresponds to the free ion value of Nd3+. The Nd moment decreases with increasing x to one half, 1.6 μB/atom. A ferromagnetic cluster model with large random anisotropy is proposed for the high coercivity alloys of this system. Magnetization curves at 4.2 K are well explained by the model, by an adjustment of the parameters for the anisotropy energy of the cluster and the inter-cluster coupling. The concentration dependence of the coercive field is discussed briefly.
AB - Melt-spun amorphous Fe1-xNdx alloys (0.11≦x≦0.60) were investigated by the magnetization measurement up to 143 kOe and the Mössbauer spectroscopy. The coercive field at 4.2 K increases abruptly at around x=0.30 with increasing x, amounting to 53 kOe at x=0.40. The hyperfine field of 57Fe at 77 K is independent of x and about 300 kOe on an average, suggesting that the magnetic moment of Fe is about 2.0μB/atom throughout this system. On this assumption and the measured magnetization at 4.2 K, it is estimated that the average Nd moment is about 3.2 μB/atom at the low x limit. This value corresponds to the free ion value of Nd3+. The Nd moment decreases with increasing x to one half, 1.6 μB/atom. A ferromagnetic cluster model with large random anisotropy is proposed for the high coercivity alloys of this system. Magnetization curves at 4.2 K are well explained by the model, by an adjustment of the parameters for the anisotropy energy of the cluster and the inter-cluster coupling. The concentration dependence of the coercive field is discussed briefly.
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U2 - 10.1143/JPSJ.59.2483
DO - 10.1143/JPSJ.59.2483
M3 - Article
AN - SCOPUS:0000665913
VL - 59
SP - 2483
EP - 2495
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
ER -