Abstract
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=040. 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 4.2K, it is estimated that the average Nd moment is about 3.2 μBatom 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 intercluster coupling. The concentration dependence of the coercive field is discussed briefly.
| Original language | English |
|---|---|
| Pages (from-to) | 2483-2495 |
| Number of pages | 13 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 59 |
| Issue number | 7 |
| Publication status | Published - 1990 Jul |
| Externally published | Yes |
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Magnetic properties of amorphous Fe-Nd alloys. / Nagayama, Katsuhisa; Ino, Hiromitsu; Saito, Naoaki; Nakagawa, Yasuaki; Kita, Eiji; Sirator, Kiiti.
In: Journal of the Physical Society of Japan, Vol. 59, No. 7, 07.1990, p. 2483-2495.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Magnetic properties of amorphous Fe-Nd alloys
AU - Nagayama, Katsuhisa
AU - Ino, Hiromitsu
AU - Saito, Naoaki
AU - Nakagawa, Yasuaki
AU - Kita, Eiji
AU - Sirator, Kiiti
PY - 1990/7
Y1 - 1990/7
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=040. 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 4.2K, it is estimated that the average Nd moment is about 3.2 μBatom 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 intercluster 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=040. 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 4.2K, it is estimated that the average Nd moment is about 3.2 μBatom 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 intercluster coupling. The concentration dependence of the coercive field is discussed briefly.
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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 -