Magnetocrystalline anisotropy of Sm<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and its interpretation on a crystal-field model

Sankar, S. G.; Rao, V. U. S.; Segal, E.; Wallace, W.E.; Frederick, William C.; Garrett, H. J.

doi:10.1103/physrevb.11.435

Cited by 151 publications

(24 citation statements)

References 16 publications

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“…We validate it by applying it to the well-known hard magnet SmCo 5 , for which the crystal-field splitting has been measured in multiple experiments. [16][17][18][19][20] We then apply our method to much less investigated new hard magnets of the RFe 12 X family, computing their CFP for different rare-earth elements (Sm or Nd) and considering N and Li interstitials. Our calculations predict the hypothetical SmFe 12 Li compound to possess a strong axial anisotropy and, possibly, interesting hard-magnetic properties.…”

mentioning

confidence: 99%

Crystal-field splittings in rare-earth-based hard magnets: Anab initioapproach

Delange

Biermann

Miyake³

et al. 2017

Phys. Rev. B

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We apply the first-principles density functional theory + dynamical mean field theory framework to evaluate the crystal-field splitting on rare-earth sites in hard magnetic intermetallics. An atomic (Hubbard-I) approximation is employed for local correlations on the rare-earth 4f shell and selfconsistency in the charge density is implemented. We reduce the density functional theory selfinteraction contribution to the crystal-field splitting by properly averaging the 4f charge density before recalculating the one-electron Kohn-Sham potential. Our approach is shown to reproduce the experimental crystal-field splitting in the prototypical rare-earth hard magnet SmCo5. Applying it to RFe12 and RFe12X hard magnets (R =Nd, Sm and X =N, Li), we obtain in particular a large positive value of the crystal-field parameter A 0 2 r 2 in NdFe12N resulting in a strong out-of-plane anisotropy observed experimentally. The sign of A 0 2 r 2 is predicted to be reversed by substituting N with Li, leading to a strong out-of-plane anisotropy in SmFe12Li. We discuss the origin of this strong impact of N and Li interstitials on the crystal-field splitting on rare-earth sites.

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confidence: 99%

Crystal-field splittings in rare-earth-based hard magnets: Anab initioapproach

Delange

Biermann

Miyake³

et al. 2017

Phys. Rev. B

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“…This is well illustrated in the calculations made involving the crystal field effects, specifically the calculations of Sankar, Rao, Segal, Wallace, Frederick and Garrett (1975) on SmCo 5 (18,19). At 0°K only the ground crystal field state is occupied.…”

Section: R (? Ni 1 7 Compoundsmentioning

confidence: 77%

Magnetic Properties of 2:17 Rare Earth Systems

Wallace

Narasimhan²

1980

The Science and Technology of Rare Earth Materials

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“…For the last two decades, many researchers focused their research on the exchange coupling in the interface between the hard and soft phases [15], the temperature dependence of the exchange spring bilayers, the effect of inter-diffusion at the interface on exchange coupling and the effect of controlled composition interface on exchange spring magnet [16]- [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thickness on Magnetic Dipolar and Exchange Interactions in SmCo/FeCo/SmCo Thin Films

Rodríguez¹,

Farías²,

Chavez³

et al. 2015

AMPC

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SmCo/FeCo/SmCo trilayer was deposited with two different thickness configurations for soft phase (FeCo); 50 nm/10 nm/50 nm and 50 nm/25 nm/50 nm were deposited on Si (111) substrate and Ta (50 nm) seed layer by RF magnetron sputtering in a pressure, p, of 30 -35 m Torr. After deposition the films were annealed under Ar atmosphere at temperature T equal to 923 and 973 for different times followed by quenching in water. X-ray diffraction patterns were obtained to identified phase presents and calculate average crystallite size. To study the effect of configuration thickness in soft phases, DC magnetic measurements were carried out; the measurements were done in the temperature interval of 300 -50 K. Hysteresis loops collected at low temperatures exposed an increment in coercivity with the decrease of T and at same time, presented a "knee" in the second quadrant of the demagnetization curve, which suggests that the inter-layer exchange coupling becomes less effective, being more evident for sample with 50 nm/25 nm/50 nm thickness. Moreover, δM (H) plots were calculated from magnetic measurements at three different temperatures, T, equal to 300, 150 and 50 K, which corroborates that the dipolar interactions became stronger when thickness of soft phases increases. Finally, the thickness effect is attributed to the SmCo5 phase magnetocrystalline anisotropy constant, which is responsible for the exchange coupling length.

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Magnetocrystalline anisotropy of SmCo5and its interpretation on a crystal-field model

Cited by 151 publications

References 16 publications

Crystal-field splittings in rare-earth-based hard magnets: Anab initioapproach

Crystal-field splittings in rare-earth-based hard magnets: Anab initioapproach

Magnetic Properties of 2:17 Rare Earth Systems

Effect of Thickness on Magnetic Dipolar and Exchange Interactions in SmCo/FeCo/SmCo Thin Films

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