3d magnetism in Y2Fe14-xMexB with Me=Co, Ni, Mn, Cr

Pareti, L.; Solzi, M.; Bolzoni, F.; Može, O.; Panizzieri, R.

doi:10.1016/0038-1098(87)90473-x

Cited by 34 publications

(7 citation statements)

References 11 publications

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“…K 1 is actually the overall second-order anisotropy term obtained by the addition of that calculated for the R sublattice and the experimental Fe sublattice anisotropy. For the Fe sublattice an average of the K , values of Y2Fe14B and La,Fe14B was used [6]. Due to the fact that this calculation, performed using the parameter given in [15] or [16], gave for HA at 293 K values which were 30-40% larger than that measured (see below), alternative values for Eo, which gave the correct values of H A at RT for both Nd2FeI4B and Pr2Fe,4B, were also considered (see table 2).…”

Section: Discussionmentioning

confidence: 99%

“…The R2Fe14B compounds have a tetragonal structure with space group P4,lmnm [2]. The existence of different crystallographic sites for R and Fe ions and the interplay between intersublattice exchange and CEF interaction lead to the wide variety of the magnetic properties of this series of compounds [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…In order to calculate the anisotropy the following procedure was used: starting from the {A;} parameters, the values of the corresponding anisotropy coefficients K ; at 0 K were derived (see equation ( 4)). Their temperature variation was obtained using the quantum analogy of the 1(f + 1)/2 power law (see equations (5)(6)(7)(8)). At any temperature it was thus possible to derive the values of the anisotropy constants of the R sublattice (3).…”

Section: Introductionmentioning

confidence: 99%

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Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr_1-xNd_x)₂Fe₁₄B compounds

Marusi¹,

Mushnikov²,

Pareti³

et al. 1990

J. Phys.: Condens. Matter

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The magnetocrystalline anisotropy of the pseudobinary (Pr1-xNdx)2Fe14B compounds has been measured by using the singular point detection (SPD) technique. The measured temperature and composition dependence of the anisotropy field has been compared with the data obtained in CEF approximations using different sets of (Anm) parameters for Nd2Fe14B and Pr2Fe14B and by considering a linear combination of the anisotropy in the mixed system. The comparison is made by calculating the anisotropy constants, then the anisotropy field values, starting from the (Anm) parameters. Experimental and calculated data concerning the occurrence of spin reorientation transition (SRT) and of type 1 and type 2 first-order magnetisation processes (FOMP) as a function of composition have also been compared.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr_1-xNd_x)₂Fe₁₄B compounds

Marusi¹,

Mushnikov²,

Pareti³

et al. 1990

J. Phys.: Condens. Matter

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“…In particular, hydrogenation has the effect to increase the Fe sublattice magnetization and to increase T c in all R 2 Fe 14 BH max compounds by nearly 60 K. [3][4][5] However, hydrogen absorption also has the effect of reducing the Fe sublattice anisotropy, namely, the first-order anisotropy constant K 1Fe reduces with increasing hydrogen content, 6 and modifying the R sublattice anisotropy. 7 As a consequence there are important losses in the magnetocrystalline anisotropy, 8 and variations in the SRT temperatures, 3,6,9,10 when such a transition is present in the pure compounds.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation effects on the magnetic and crystal-field interactions in theR2Fe14BH

et al. 2000

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The magnetic properties of the R 2 Fe 14 BH x (RϭGd, Pr, and Dy͒ compounds have been studied by measuring low-field ac magnetic susceptibility vs temperature and magnetization vs temperature and applied magnetic field on magnetically aligned samples. A strong reduction in the magnetocrystalline anisotropy of the Gd-based compounds is observed, and the compounds remain axial in the measured temperature range. A hydrogen induced spin reorientation transition ͑HISRT͒ takes place in the Dy 2 Fe 14 BH x series for xу1, with the transition temperature T s increasing with increasing hydrogen content. In the Pr 2 Fe 14 BH x compounds no HISRT is found, however for 0Ͻxр3 we observe first-order magnetization processes ͑FOMP͒, with the critical field H c decreasing with increasing hydrogen content. For the Pr 2 Fe 14 BH 5.5 compound the reduction is so strong that H c Ϸ0, and the compound remains in a conical phase in the studied temperature range ͑5 -470 K͒. We have combined analytical methods and a crystalline electric field-mean field model to obtain a quantitative evaluation of the effect of hydrogenation on the magnetic and crystal-field interactions. We have found that the observed behavior in the Gd, Dy, and Pr series can be explained by a decrease of the Fe sublattice anisotropy and by a decrease ͑in the Dy and Pr series͒ of the crystal-field parameters B n0 (nϭ2, 4, and 6͒ under hydrogenation. The hydrogen induced variations of the R-Fe exchange interaction seem to have a minor influence on the observed magnetic behavior.

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“…The addition of Mn on NdFeB magnet can be another method to enhance the coercivity, because it increases c-axis magneto-crystalline anisotropy by increasing c/a ratio of Nd 2 Fe 14 B lattices [3]. In addition, the wettability and continuity of Nd-rich phase can be enhanced by Mn addition because Mn decreases the melting point of Nd-rich phase [4].…”

Section: Introductionmentioning

confidence: 99%

Effect Of DyMn Alloy-Powder Addition On Microstructure And Magnetic Properties Of NdFeB Sintered Magnets

Lee¹,

Dhakal²,

Kim³

et al. 2015

Archives of Metallurgy and Materials

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Micostructural change and corresponding effect on coercivity of a NdFeB sintered magnet mixed with small amount of DyMn powder was investigated. In the sintered magnet mixed with the DyMn alloy-powder Dy-rich shell was formed at outer layer of the main grains, while Mn was mostly concentrated at Nd-rich triple junction phase (TJP), lowering melting temperature of the Nd-rich phase that eventually improved the microstructural characteristics of the gain boundary phase. The coercivity of a magnet increased more than 3.5 kOe by the mixing of the DyMn alloy-powder.

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3d magnetism in Y2Fe14-xMexB with Me=Co, Ni, Mn, Cr

Cited by 34 publications

References 11 publications

Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr_1-xNd_x)₂Fe₁₄B compounds

Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr_1-xNd_x)₂Fe₁₄B compounds

Hydrogenation effects on the magnetic and crystal-field interactions in theR2Fe14BH

Effect Of DyMn Alloy-Powder Addition On Microstructure And Magnetic Properties Of NdFeB Sintered Magnets

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3d magnetism in Y2Fe14-xMexB with Me=Co, Ni, Mn, Cr

Cited by 34 publications

References 11 publications

Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr1-xNdx)2Fe14B compounds

Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr1-xNdx)2Fe14B compounds

Hydrogenation effects on the magnetic and crystal-field interactions in theR2Fe14BH

Effect Of DyMn Alloy-Powder Addition On Microstructure And Magnetic Properties Of NdFeB Sintered Magnets

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Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr_1-xNd_x)₂Fe₁₄B compounds

Magnetocrystalline anisotropy and first-order magnetisation processes in (Pr_1-xNd_x)₂Fe₁₄B compounds