Magnetic Properties of Amorphous Fe-Nd Alloys<sup>*</sup>

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

doi:10.1143/jpsj.59.2483

Cited by 32 publications

(18 citation statements)

References 15 publications

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“…These indicate that the high coercivity in the NdAlFeCo alloy is due to the presence of the amorphous phase. Our results support the previously proposed ferromagnetic cluster model with large random anisotropy, and it shows that the high coercivity is attributed to the development of the homogeneous dispersion of the Fe(Co)-rich clusters with large local magnetic anisotropy from the highly relaxed disordered structure developed at a cooling rate of about 10 1 -10 2 K s − 1 , which is much slower than the cooling rate of 10 4 -10 6 K s − 1 in conventional spun-melt method [23]. No distinct low temperature relaxation transition is found in both DSC and DMTA curves of the as-cast sample, and it confirms the relaxed structure of Nd 60 Al 10 Fe 20 Co 10 BMG.…”

Section: Resultsmentioning

confidence: 73%

Glass transition and thermal stability of hard magnetic bulk NdAlFeCo metallic glass

Wei¹,

Wang²,

Xia³

et al. 2002

Materials Science and Engineering: A

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Glass transition and thermal stability of bulk Nd 60 Al 10 Fe 20 Co 10 metallic glass were investigated by means of dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The glass transition temperature, not revealed by DSC, is alternatively determined by DMTA via storage modulus E% and loss modulus E¦ measurement to be 498 K at a heating rate of 0.167 K s − 1 . The calculated reduced glass transition temperature (T g /T m ) is 0.63. The large value of T g /T m of this alloy is consistent with its good glass-forming ability. The crystallization process of the metallic glass is concluded as follows: amorphous amorphous+ metastable FeNdAl phase amorphous+primary d-FeNdAl phaseprimary d-phase+eutectic d-phase+Nd 3 Al+Nd 3 Co. The appearance of hard magnetism in this alloy is ascribed to the presence of amorphous phase with highly relaxed structure. The hard magnetism disappeared after the eutectic crystallization of the amorphous phase.

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Section: Resultsmentioning

confidence: 73%

Glass transition and thermal stability of hard magnetic bulk NdAlFeCo metallic glass

Wei¹,

Wang²,

Xia³

et al. 2002

Materials Science and Engineering: A

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“…However, no ferromagnetic crystalline grains exist in the BMG. According to the cluster model of the Nd-Fe melt-spinning magnetic system, the exchange coupling interaction among magnetic clusters with ran- dom anisotropy could cause the high coercivity of themagnetic system [11] . Inoue confirmed the presence of these short range ordered clusters in the Nd-Fe-Al system by high-resolution transmission electron microscopy and radial distribution function studies.…”

Section: Resultsmentioning

confidence: 99%

Domain structure of hard magnetic NdAlFeCo bulk metallic glass

et al. 2001

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Magnetic domain structure of hard magnetic Nd 60 Al 10 Fe 20 Co 10 bulk metallic glass (BMG) has been studied by using magnetic force microscopy. In the magnetic force images it is shown that the exchange interaction type magnetic domains with a period of about 360 nm do exist in the BMG, which is believed to be associated with the appearance of hard-magnetic properties in this system. As the scale of the magnetic domain is much larger than the size of the short-range ordered atomic clusters existing in the BMG, it is believed that the large areas of magnetic contrast are actually a collection of a group of clusters aligned in parallel by strong exchange coupling interaction. After fully crystallization, the BMG exhibits paramagnetism. No obvious magnetic contrast is observed in the magnetic force images of fully crystallized samples, except for a small quantity of ferromagnetic crystalline phase with low coercivity and an average size of 900 nm.

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“…We have previously reported that the exchange coupling between Nd atom and Fe atom was enhanced by Co addition in Nd 60 Fe x Co 30Àx Al 10 (x ¼ 10, 15 and 20) samples. Furthermore, by increasing the substituting Co for Fe, the random magnetic anisotropy was increased because of the exchange coupling of Nd-Co. 7,12) Thereby, the coercivity value of Nd 65 Fe 10 Co 15 Al 10 sample is the largest value. Also, the M-H loops are not saturated.…”

Section: Ingots With Composition Of Ndmentioning

confidence: 93%

Amorphous Formation and Magnetic Properties of Nd-Fe-Co-Al Alloys by Gas Flow Type Levitation Process

Azumo

Nagayama

2006

Mater. Trans.

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Magnetic Properties of Amorphous Fe-Nd Alloys^*

Cited by 32 publications

References 15 publications

Glass transition and thermal stability of hard magnetic bulk NdAlFeCo metallic glass

Glass transition and thermal stability of hard magnetic bulk NdAlFeCo metallic glass

Domain structure of hard magnetic NdAlFeCo bulk metallic glass

Amorphous Formation and Magnetic Properties of Nd-Fe-Co-Al Alloys by Gas Flow Type Levitation Process

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Magnetic Properties of Amorphous Fe-Nd Alloys*

Cited by 32 publications

References 15 publications

Glass transition and thermal stability of hard magnetic bulk NdAlFeCo metallic glass

Glass transition and thermal stability of hard magnetic bulk NdAlFeCo metallic glass

Domain structure of hard magnetic NdAlFeCo bulk metallic glass

Amorphous Formation and Magnetic Properties of Nd-Fe-Co-Al Alloys by Gas Flow Type Levitation Process

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Magnetic Properties of Amorphous Fe-Nd Alloys^*