Magnetic analysis of a melt-spun Fe-dilute Cu60Au35Fe5 alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:640

Article

Kondo, Shin-ichiro¹  Ogawa, Kento¹  Morimura, Takao¹  Nakashima, Hiromichi¹  Kobayashi, Shin-Taro²  Michioka, Chishiro²  Yoshimura, Kazuyoshi² 

[1] Nagasaki Univ, Fac Engn, Nagasaki 8528521, Japan

[2] Kyoto Univ, Dept Chem, Sakyo Ku, Kyoto 6068502, Japan

关键词: Melt-spun;    Magnetic measurements;    TEM;    Cu-Au-Fe;    Fe-dilute;    Spin glass;   

DOI  :  10.1016/j.jallcom.2015.04.004

来源: Elsevier

【 摘 要 】

The magnetic properties of a melt-spun Cu60Au35Fe5 alloy are examined by X-ray diffraction (XRD), magnetic measurements, and transmission electron microscopy (TEM). The XRD pattern of an as-spun sample indicates the formation of a solid solution of Cu and Au with no Fe phase, whereas that of the annealed sample (773 K x 36 ks) shows a small amount of the alpha-Fe phase because the Fe atoms precipitate during annealing. TEM observations and EDX analysis of the as-spun sample show no distinct Fe-rich domains, implying that some Fe atoms are dissolved in the matrix, and others form very fine magnetic clusters. Moreover, magnetic measurements indicate the presence of magnetic clusters and isolated Fe atoms. The AC magnetic susceptibilities show that the as-spun sample has a sharp cusp around 20 K, which is characteristic of spin glass behavior. The simulations of the M-H curves of the as-spun sample measured at 77 and 300 K, show that most Fe atoms are dissolved in the matrix as isolated atoms, not as clusters. Additionally, the calculated rate of clustering in the as-spun sample tends to decrease with temperature, suggesting that the magnetic exchange interactions are weak. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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