The strength of the R-T exchange coupling in R2Fe14B compounds

Verhoef, R.; Quang, Phạm Hồng; Franse, J.J.M.; Radwański, R. J.

doi:10.1016/0304-8853(90)90460-8

Cited by 46 publications

(24 citation statements)

References 6 publications

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“…For the high-field free-powder ͑HFFP͒ measurements, 3,4 finepowder ͑Ͻ40 m͒ samples were loosely loaded into the sample holders. These particles can be considered as monocrystalline and are free to rotate in the external field so that the total magnetic moment of the samples is always parallel to the external field direction.…”

Section: Resultsmentioning

confidence: 99%

“…1 HFFP measurements are usually used to get information about the intersublattice interaction in heavy-rare-earth transition-metal compounds. 3,4 If the external field is so high that the collinear configuration of the magnetic moments of the rare-earth and transition-metal sublattices is broken, the coupling constant n RT can be obtained from the slope of the bending process if the anisotropy of at least one of the sublattices is negligible. In external fields up to 28 T, the bending process can be observed in ErFe 11Ϫx Mn x Ti compounds with xϭ1, 2, and 3 ͑see Fig.…”

Section: Resultsmentioning

confidence: 99%

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Magnetic properties of R(Fe,Mn)11Ti compounds

Zhao

Kou

Zhang³

et al. 1996

Journal of Applied Physics

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High-field magnetization measurements have been performed on both free-powder samples and magnetically aligned samples of R͑Fe,Mn͒ 11 Ti ͑RϭY, Nd, Sm, Gd, Er͒ compounds at 4.2 K in a step field up to 28 T. The temperature dependence of ac susceptibilities of R͑Fe,Mn͒ 11 Ti has been measured in a temperature range from 4.2 to 800 K. It has been found that both the magnetic moment of the transition-metal sublattice and the Curie temperature of RFe 11Ϫx Mn x Ti compounds decrease with increasing x. Spin reorientations occur in ErFe 11Ϫx Mn x Ti compounds as the result of competition between the uniaxial anisotropy of the transition-metal sublattice and the planar or conical anisotropy of the Er sublattice. The intersublattice exchange constants n RT of ErFe 11Ϫx Mn x Ti compounds have been deduced by the high-field free-powder method. The effect of the substitution of Fe by Mn on the magnetic anisotropies of R͑Fe,Mn͒ 11 Ti with RϭY, Nd, Sm has been investigated. First-order magnetization processes take place in SmFe 11Ϫx Mn x Ti compounds when the external field is applied perpendicular to the alignment direction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Magnetic properties of R(Fe,Mn)11Ti compounds

Zhao

Kou

Zhang³

et al. 1996

Journal of Applied Physics

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“…͑4͒. 6 For example, n RT of a-Fe 78 Gd 22 was derived as 1.52 ϫ10 4 Ϯ0.02, where M was measured in emu/g units and J RT 's were estimated as Ϫ16.5ϫ10 Ϫ16 erg (Xϭ22) and Ϫ18.1ϫ10 Ϫ16 erg (Xϭ24). Here, m Gd ϭ7 B and m Fe ϭ2 B were used.…”

Section: Discussionmentioning

confidence: 99%

“…Using this enabled Verhoef et al and Liu et al to evaluate the interaction between RE and T elements in ferromagnetic RE-T 2 and RE-T 3 intermetallic compounds. 6,7 In both studies, magnetic RE elements were diluted by the nonmagnetic element of yttrium decreasing exchange coupling. There have been few reports on high-field-magnetization analysis to obtain exchange coupling in amorphous materials except for amorphous RE-Co-B alloys.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of inter-sublattice exchange constants in amorphous FeGd alloys

Kita

Hata

Yano

et al. 2004

Journal of Applied Physics

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High-field-magnetization measurements were assessed for melt-spun amorphous Fe 100Ϫx Gd x alloys. Samples with Xϭ22 and 24 clearly revealed ferrimagnetic spin-flip transition around 100-150 kOe at 4.2 K and their magnetizations linearly increased with increasing magnetic field above the transition. This magnetization process with spin flipping is well understood with molecular field approximation assuming a simple two-sublattice ferrimagnet. Inter-sublattice exchange constants J RT were obtained directly and amplitudes were Ϫ16.5ϫ10 Ϫ16 erg for Xϭ22 and Ϫ18.1 ϫ10 Ϫ16 erg for Xϭ24 samples. These agree with previously reported values estimated by molecular field analysis.

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“…Recently, an elegant method has been developed [2] to derive information on the R-T interaction which, in a first approximation, is not disturbed by other terms in the free energy. This method has first been applied to a monocrystalline sphere (diameter 3 mm) of the compound Ho2Co17.…”

Section: Introductionmentioning

confidence: 99%

High-magnetic-field studies of R-T intermetallics

Franse¹,

Boer²

1995

Journal of Magnetism and Magnetic Materials

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A review is presented of high-field magnetization studies on 3d-rich rare-earth intermetallic compounds. The emphasis is on the evaluation of the intersublattice coupling of the rare-earth and 3d magnetic moments from magnetization studies on monocrystalline samples that are free to orient and reorient themselves in the applied magnetic field. As a first approach, a two-sublattice model is introduced with a dominant anisotropy for one of the sublattices. Several extensions of this model are also discussed. This model is found to be very well applicable to powdered samples prepared from polycrystalline ingots if the powder particles are sufficiently small to consider them as single-grain particles.

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The strength of the R-T exchange coupling in R2Fe14B compounds

Cited by 46 publications

References 6 publications

Magnetic properties of R(Fe,Mn)11Ti compounds

Magnetic properties of R(Fe,Mn)11Ti compounds

Experimental determination of inter-sublattice exchange constants in amorphous FeGd alloys

High-magnetic-field studies of R-T intermetallics

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