Structure of Melt-Quenched Pr&amp;ndash;Fe Alloys and Analysis of the Magnetization Based on Super-Ferromagnetism

Yoshiike, Shogo; Adachi, H.; Ichinose, Hideki; Tokumitsu, Kazuto; Ino, Hiromitsu; Siratori, Kiiti

doi:10.2320/matertrans1989.39.102

Cited by 21 publications

(17 citation statements)

References 8 publications

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“…6). Similar results have been reported for amorphous rare-earth iron ribbons [7,10], by which formation of Fe-rich clusters was assumed to be responsible for the superparamagnetism. It is also expected that the superparamagnetism in Y 60 Fe 30 Al 10 ribbons (Fig.…”

Section: Resultssupporting

confidence: 76%

“…Because of partial crystallization of yttrium in the ribbon melt-spun at 5 m/s, the Fe concentration of the amorphous phase in the ribbon melt-spun at 5 m/s should be higher than the Fe concentration of the amorphous phase in the fully amorphous ribbon meltspun at 30 m/s. Yoshiike et al [7] have reported that iron-rich clusters have been found in amorphous Pr±Fe alloys and the average number of iron atoms per cluster (corresponding to the cluster size) increased with increasing Fe concentration in the amorphous phase. The two magnetization curves taken at 220 and 150K respectively for the ribbon melt-spun at 5 m/s supported the suggestion of larger cluster size or stronger cluster interaction (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Structure and Magnetic Properties of Y60Fe30Al10 Melt-Spun Ribbons

Ding

Wang

1999

phys. stat. sol. (a)

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The structural and magnetic properties of Y60Fe30Al10 melt‐spun ribbons have been studied in this work. Fully amorphous alloys were obtained after melt‐spinning at higher speeds (>15 m/s). Ribbons melt‐spun at lower speeds consisted of a mixture of amorphous and crystalline yttrium. The yttrium crystallites in the ribbon melt‐spun at 5 m/s possessed a strong crystallographic texture. The crystallization of the amorphous phase led to the formation of a mixture of crystalline yttrium and a ternary Y–Fe–Al phase. By Mössbauer study, the quadrupole splitting and isomer shift of the amorphous phase increased with decreasing melt‐spinning speed, indicating a possible change in microstructure. The magnetization curves of Y60Fe30Al10 ribbons could be described with superparamagnetism, suggesting that iron‐rich clusters might be present in the amorphous phase.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Structure and Magnetic Properties of Y60Fe30Al10 Melt-Spun Ribbons

Ding

Wang

1999

phys. stat. sol. (a)

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“…By assuming ferromagnetic coupling between atom spins within each cluster, it is reasonable to expect a temperature dependence of m, i.e. m ¼ m(T) [18,19], where…”

Section: Article In Pressmentioning

confidence: 99%

Thermomagnetic transitions and coercivity mechanism in bulk composite Nd60Fe30Al10 alloys

Ortega-Zempoalteca

Betancourt

Valenzuela

2009

Journal of Magnetism and Magnetic Materials

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“…The glassy nature is further confirmed by DSC measurements as shown in the inset of Figure 3(a). All alloys exhibit a sharp exothermic peak due to the massive crystallization, and no obvious endothermic event for a glass transition is visible, similar to other RE-Fe based metallic glasses [23] . Figure 3(b) shows the temperature dependence of the magnetization for FeGd-based glassy composite, pure Gd.…”

Section: Resultsmentioning

confidence: 88%

“…When the spin velocity decreases to 10 m/s, a broadening crystalline peak is superimposed on the XRD curve due to the formation of nanocrystalline Gd, and the ribbon has a mixed microstructure of nanocrystals and glassy matrix, which is consistent with the direct atomic/magnetic force microscope (AFM/MFM) observation. In fact, the nanocrystals smaller than 2 nm, which cannot be detected within the resolution limit of the XRD, have been widely observed in Re-Fe based metallic glass by HRTEM [22,23] . The glassy nature is further confirmed by DSC measurements as shown in the inset of Figure 3(a).…”

Section: Resultsmentioning

confidence: 98%

Giant enhancement of magnetocaloric effect in metallic glass matrix composite

Wang

Bai

Pan

et al. 2008

Sci. China Ser. G-Phys. Mech. As

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The magnetocaloric effect (MCE) has made great success in very low temperature refrigeration, which is highly desirable for application to the extended higher temperature range. Here we report the giant enhancement of MCE in the metallic glass composite. The large magnetic refrigerant capacity (RC) up to 10 3 J·kg −1 is more than double the RC of the well-known crystalline magnetic refrigerant compound Gd 5 Si 2 Ge 1.9 Fe 0.1 (357 J·kg −1 ) and MnFeP 0.45 As 0.55 (390 J·kg −1 )(containing either exorbitant-cost Ge or poisonous As). The full width at half maximum of the magnetic entropy change (ΔS m ) peak almost spreads over the whole low-temperature range (from 303 to 30 K), which is five times wider than that of the Gd 5 Si 2 Ge 1.9 Fe 0.1 and pure Gd. The maximum ΔS m approaches a nearly constant value in a wide temperature span over 100 K, and however, such a broad table-like region near room temperature has seldom been found in alloys and compounds. In combination with the intrinsic amorphous nature, the metallic glass composite may be potential for the ideal Ericsson-cycle magnetic refrigeration over a broad temperature range near room temperature. metallic glass, magnetocaloric effect, composite

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Structure of Melt-Quenched Pr–Fe Alloys and Analysis of the Magnetization Based on Super-Ferromagnetism

Cited by 21 publications

References 8 publications

Structure and Magnetic Properties of Y60Fe30Al10 Melt-Spun Ribbons

Structure and Magnetic Properties of Y60Fe30Al10 Melt-Spun Ribbons

Thermomagnetic transitions and coercivity mechanism in bulk composite Nd60Fe30Al10 alloys

Giant enhancement of magnetocaloric effect in metallic glass matrix composite

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