Spin reorientation and magnetocrystalline anisotropy of (Nd1-xREx)2Fe14B (RE=Y, Pr)

Kim, M. J.; Kim, S. G.; Song, Minseok; Hur, Jin; Jin, Ho; Kim, T. K.

doi:10.3379/jmsjmag.23.498

Cited by 12 publications

(16 citation statements)

References 12 publications

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“…This factor causes the large magnetization anisotropy of the Er ions at the SRT. The obtained values of K Er 1 and E ErFe agree with those found in [32] but differ from values presented in [33].…”

Section: Crystalline State Of the Efb Samplesupporting

confidence: 80%

Magnetism of ordered and disordered alloys of R2Fe14B (R = Nd, Er) type

Teplykh

Chukalkin

Lee

et al. 2013

Journal of Alloys and Compounds

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a b s t r a c tMagnetic susceptibility, magnetization and neutron diffraction measurements have been performed to study structure and magnetic states of crystalline and amorphous Nd 2 Fe 14 B and Er 2 Fe 14 B alloys. In the crystalline state there exists a large (about 20%) anisotropy of Er-sublattice magnetization. Values of the magnetic anisotropy constant of Er ions and the Er-Fe exchange-coupling parameter were estimated using temperature dependence of the Er-and Fe-sublattice magnetizations. Amorphous state of the samples was obtained by irradiation of fast (E eff P 1 MeV) neutrons with a fluence up to the 1.2 Â 10 20 n/cm À2 at 340 K. It is shown that antiferromagnetic coupling between the rare-earth and iron spins is kept in the amorphous state. Amorphization of the samples is found to result in reduction of the Curie temperature (T C ) by about 200 K and almost total absence of coercivity. We suggest that the strong decrease of T C is a consequence of enhancement of negative Fe-Fe interactions as a result of dispersion of interatomic distances, which is a characteristic feature of the amorphous state.

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Section: Crystalline State Of the Efb Samplesupporting

confidence: 80%

Magnetism of ordered and disordered alloys of R2Fe14B (R = Nd, Er) type

Teplykh

Chukalkin

Lee

et al. 2013

Journal of Alloys and Compounds

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“…This is not surprising because the Pr 2 Fe 14 B phase shows no spin reorientation over the whole of the temperature range between 4.2 K and T C [11] and no magnetization anomaly is observed in Pr 12 (Fe 1−x Co x ) 82 B 6 alloys. This trend agrees with published data on single crystal and sintered (Nd/Pr)FeB magnets [12] (although the absolute values of T SR are smaller in the present case due to the nanostructure). It is worthy of note that a spin reorientation still occurs up to at least 75% Pr substituted alloys.…”

Section: The Microstructure and Composition Dependence Of T Srsupporting

confidence: 94%

“…1 shows the influence of d g for the 2/14/1 phase on T SR . The results indicate that T SR for all single phase nanocrystalline Nd 12 Fe 82 B 6 alloys are lower than 135 K, which was reported previously for single crystal Nd 2 Fe 14 B and for sintered (d g > 2 m) NdFeB magnets using various measuring methods [7][8][9]. The values of T SR corresponding to d g of 110, 85, 53, 41 and 26 nm are 128, 127, 124, 118 and 115 K, respectively, which clearly shows that T SR is influenced by the scale of the microstructure when the grain size decreases to the nanometer level, with decreasing d g leading to lower T SR .…”

Section: Methodssupporting

confidence: 70%

“…It is worthy of note that a spin reorientation still occurs up to at least 75% Pr substituted alloys. The effect of Pr content on T SR results from the compositional dependence of K 1 and K 2 for (Nd 1−y Pr y ) 2 Fe 14 B alloys, where the sign of K 1 becomes positive at 4.2 K at the composition y ≥ ∼0.8 [12]. Therefore, the spin reorientation in (Nd 1−y Pr y ) 2 Fe 14 B is expected to disappear for y ≥0.…”

Section: The Microstructure and Composition Dependence Of T Srmentioning

confidence: 91%

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Sub-ambient magnetic properties of nanophase Nd/Pr–Fe–B based hard magnetic alloys

Liu

Davies

2006

Journal of Alloys and Compounds

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“…The spin reorientation temperature T sr was determined by a minimum in the curve of dχ ′/dT versus T. As shown in Figure 6, the T sr for Nd 2 Fe 14 B phase decreases from 131 K for (a) Nd 12.3 Fe 81.7 B 6.0 ribbon to 124 K for (b) Nd 12.3 Fe 80.2 Zr 1.5 B 6.0 ribbon. It is evident that these values are lower than 135 K, the value reported previously for single crystal or sintered Nd 2 Fe 14 B magnets [21]. The intrinsic magnetic properties like T sr are usually considered to be independent of the microstructure.…”

Section: Dependence Of T Sr On Additive Elementsmentioning

confidence: 89%

Effect of additive elements on exchange coupling and spin reorientation transition of nanocrystalline single-phase Nd-Fe-B alloy

Bao

Gao

Zhu

et al. 2010

Sci. China Technol. Sci.

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Nd 12.3 Fe 81.7-x Zr x B 6.0 (x=0, 1.5) and (NdDyTb) 12.3 (FeZrNbCu) 81.7-y Co y B 6.0 (y=0, 12) ribbons were prepared by melt spinning at 22 m/s and subsequent annealing. The influences of Zr, Dy/Tb and Co substitutions on magnetic properties and spin reorientation transitions of nanophase Nd 2 Fe 14 B have been systematically investigated. Compared with Zr-free sample, the remanence, intrinsic coercivity and maximum energy product for Nd 12.3 Fe 80.2 Zr 1.5 B 6.0 ribbon increase by 10.8 %, 17.8 % and 60.2 %, respectively. The significant improvement of magnetic properties originates from the finer grains of the sample by introducing Zr, which leads to the stronger exchange coupling between neighboring grains. The intrinsic coercivity for (DyTb)-substituted ribbon is significantly increased although the remanence is reduced, which could be compensated by the substitution of Co for Fe. The spin reorientation temperature T sr of nanocrystalline Nd 2 Fe 14 B alloys was determined by measuring the ac magnetic susceptibility. It was found to be lower than that of bulk Nd 2 Fe 14 B. The substitutions of Zr, Dy/Tb and Co result in reduction of T sr . The smaller the grain size, the lower the T sr will be. Influence of spin reorientation on magnetization characteristics of nanophase Nd 2 Fe 14 B was discussed.nanocrystalline Nd-Fe-B magnet, exchange coupling, spin reorientation transition, magnetic properties Citation:Bao X Q, Gao X X, Zhu J, et al. Effect of additive elements on exchange coupling and spin reorientation transition of nanocrystalline single-phase Nd-Fe-B alloy.

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Spin reorientation and magnetocrystalline anisotropy of (Nd1-xREx)2Fe14B (RE=Y, Pr)

Cited by 12 publications

References 12 publications

Magnetism of ordered and disordered alloys of R2Fe14B (R = Nd, Er) type

Magnetism of ordered and disordered alloys of R2Fe14B (R = Nd, Er) type

Sub-ambient magnetic properties of nanophase Nd/Pr–Fe–B based hard magnetic alloys

Effect of additive elements on exchange coupling and spin reorientation transition of nanocrystalline single-phase Nd-Fe-B alloy

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