Magnetic properties of amorphous Fe-Nd alloys

Katsuhisa Nagayama, Hiromitsu Ino, Naoaki Saito, Yasuaki Nakagawa, Eiji Kita, Kiiti Sirator

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)2483-2495
Number of pages13
JournalJournal of the Physical Society of Japan
Volume59
Issue number7
Publication statusPublished - 1990 Jul
Externally publishedYes

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magnetic properties
magnetization
moments
anisotropy
coercivity
atoms
magnetic moments
adjusting
curves
spectroscopy
ions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nagayama, K., Ino, H., Saito, N., Nakagawa, Y., Kita, E., & Sirator, K. (1990). Magnetic properties of amorphous Fe-Nd alloys. Journal of the Physical Society of Japan, 59(7), 2483-2495.

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 journalArticle

Nagayama, K, Ino, H, Saito, N, Nakagawa, Y, Kita, E & Sirator, K 1990, 'Magnetic properties of amorphous Fe-Nd alloys', Journal of the Physical Society of Japan, vol. 59, no. 7, pp. 2483-2495.
Nagayama K, Ino H, Saito N, Nakagawa Y, Kita E, Sirator K. Magnetic properties of amorphous Fe-Nd alloys. Journal of the Physical Society of Japan. 1990 Jul;59(7):2483-2495.
Nagayama, Katsuhisa ; Ino, Hiromitsu ; Saito, Naoaki ; Nakagawa, Yasuaki ; Kita, Eiji ; Sirator, Kiiti. / Magnetic properties of amorphous Fe-Nd alloys. In: Journal of the Physical Society of Japan. 1990 ; Vol. 59, No. 7. pp. 2483-2495.
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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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