Magnetic Properties of Nd&amp;ndash;Fe&amp;ndash;B&amp;ndash;Cr Nanocrystalline Composite Magnets

Hinomura, Toru; Nasu, Saburo; Kanekiyo, H.; Uehara, Minoru; Hirosawa, S.

doi:10.2320/matertrans1989.38.1106

Cited by 17 publications

(7 citation statements)

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“…9,11,12) The magnetic properties of these alloys depend on the phases precipitated, the grain size, the distribution and the interphase boundary structures between hard and soft magnetic particles. [13][14][15][16] In the previous study on a Pr 4.5 Fe 77 B 18.5 amorphous ribbon, 17) it has been confirmed that the precipitation sequence during isothermal annealing is; amorphous (Am) → Fe 3 17) The phases in the brackets shows those formed at the prior stage of annealing. The magnetic properties of these nanocomposites vary sensitively with the structural change during isothermal annealing.…”

Section: Introductionmentioning

confidence: 85%

Effects of Metastable Phase Formation on the Magnetic Properties of Pr4.5Fe77B18.5 Amorphous Ribbons

et al. 2002

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Section: Introductionmentioning

confidence: 85%

Effects of Metastable Phase Formation on the Magnetic Properties of Pr4.5Fe77B18.5 Amorphous Ribbons

et al. 2002

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“…For example, Nd 4.5 Fe 77 B 18.5 is a hard magnet in the crystalline state but shows soft magnetic properties in the rapidly quenched amorphous state. 19 The hard magnetic properties of the cylinder indicate that its atoms are ordered in a special configuration. Since annealing reduces the remanence and the saturation magnetization of the cylinder and the fully crystallized alloy is paramagnetic, it is supposed that the as-cast cylinder has a metastable ordered cluster structure.…”

Section: Discussionmentioning

confidence: 99%

Atomic ordering and magnetic properties in Nd57Fe20B8Co5Al10 solids

Xing

Eckert

Löser

et al. 2000

Journal of Applied Physics

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Articles you may be interested inEffect of nanocrystallization on the structure and the magnetic properties of Nd-Fe-Co-Al-B glassy alloy J. Appl. Phys. 99, 093906 (2006); 10.1063/1.2195367 Effect of stress and/or field annealing on the magnetic behavior of the ( Co 77 Si 13.5 B 9.5 ) 90 Fe 7 Nb 3 amorphous alloy J. Appl. Phys. 97, 034911 (2005); 10.1063/1.1845577Glass-forming ability and soft magnetic properties of FeCoSiAlGaPCB amorphous alloys bulk cylinders and ribbons were quenched from the melt at different cooling rates using copper mold casting and melt spinning, respectively. Both the melt-spun ribbons and the cast cylinders display x-ray diffraction patterns without obvious crystalline peaks. However, the ribbons show soft magnetic properties, the cylinders are hard magnetic, and the crystallized alloys are not ferromagnetic at all. On the other hand, the cylinders show different exothermic transformation behavior than the ribbons upon heating to elevated temperatures. While the ribbons are regarded as amorphous, the structure of the cylinders prepared at slower cooling rate is considered to consist of metastable ordered clusters. This structure forms in the undercooled melt most likely due to intensive generation of ordered nuclei and slow growth kinetics. The magnetic coherence length, which is equivalent to the dimension of the ordered clusters, may be larger than the exchange length. Therefore, the cylinders shows much larger coercivity than the ribbons.

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“…3 to 7). Some results using 57 Fe Mössbauer spectra [9,14,15] or APFIM [17,18] reported that Cr preferentially moves to Fe 3 B. Such results imply that Cr has a strong chemical attraction to B.…”

Section: Discussionmentioning

confidence: 98%

“…[12], and among them, Cr has been known to stabilize the Fe 3 B phase, to suppress grain growth and the formation of the metastable Nd 2 Fe 23 B 3 phase [13], effectively improving coercivity. Thus, it is important to understand the role of the Cr atoms on the crystallization processes [9,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%