AFM SURFACE ANALYSIS OF Fe-Co-Mo ELECTROLYTIC COATINGS

Yermolenko, Iryna; Ved, Maryna; Сахненко, Н. Д.; Zubanova, S.I.; Tychyna, O.N.

doi:10.15407/hftp08.01.091

Cited by 4 publications

(9 citation statements)

References 12 publications

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“…at 0 K compares favorably to the values of 3.6 and 3.9 meV reported in Refs. [28] and [51]. At 300 K, our value of 2.19 meV exhibits a slightly faster decay with temperature compared to experiment (2.6 and 3.0 meV), which we attribute to our use of a classical spin hamiltonian in the DLM picture [36,44].…”

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confidence: 54%

“…Specifically, we show how to directly simulate experiments by calculating, from first principles (FP), how the measured magnetization (M ) varies as a function of field (B) applied along different directions and at different temperatures. We apply our "FPMVB" approach to the RE-TM ferro and ferrimagnets YCo 5 and GdCo 5 , which are isostructural to the technologically-important SmCo 5 [24] and, in the case of GdCo 5 , a source of controversy in the literature [25][26][27][28][29][30][31][32][33][34][35]. Pairing FPMVB with new measurements of the MCA of GdCo 5 allows us to resolve this controversy.…”

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confidence: 99%

“…1. As recognized at the time of the original experiments [27][28][29][30], the reduced value of K eff with respect to κ 1 of YCo 5 is a fingerprint of canting between the Gd and Co sublattices.…”

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confidence: 99%

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Calculating the Magnetic Anisotropy of Rare-Earth–Transition-Metal Ferrimagnets

et al. 2018

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Magnetocrystalline anisotropy, the microscopic origin of permanent magnetism, is often explained in terms of ferromagnets. However, the best performing permanent magnets based on rare earths and transition metals (RE-TM) are in fact ferrimagnets, consisting of a number of magnetic sublattices. Here we show how a naive calculation of the magnetocrystalline anisotropy of the classic RE-TM ferrimagnet GdCo_{5} gives numbers that are too large at 0 K and exhibit the wrong temperature dependence. We solve this problem by introducing a first-principles approach to calculate temperature-dependent magnetization versus field (FPMVB) curves, mirroring the experiments actually used to determine the anisotropy. We pair our calculations with measurements on a recently grown single crystal of GdCo_{5}, and find excellent agreement. The FPMVB approach demonstrates a new level of sophistication in the use of first-principles calculations to understand RE-TM magnets.

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Calculating the Magnetic Anisotropy of Rare-Earth–Transition-Metal Ferrimagnets

et al. 2018

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“…%) is achieved at ratio t on /t off =10 ms/10 ms (20 ms/10 ms). At such composition of coatings, it is possible to expect that the obtained materials will possess improved microhardness in combination with the soft magnetic properties [35,36].…”

Section: Results Of the Formation Of A Ternary Fe-co-mo Alloymentioning

confidence: 99%

Research into influence of the electrolysis modes on the composition of galvanic Fe-Co-Mo coatings

Yermolenko

Ved

Karakurkchi

et al. 2017

EEJET

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“…Therefore the magnetic anisotropy of GdCo 5 is dominated by the MCA of the sublattice of Co atoms, with only a small dipolar contribution from the Gd moments. The magnetic response is determined by a competition between this MCA, the exchange interaction between the Gd and Co sublattices, and the interaction of these sublattices with the external field [8].…”

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Field-induced canting of magnetic moments in GdCo₅ at finite temperature: first-principles calculations and high-field measurements

Patrick

Kumar

Götze

et al. 2018

J. Phys.: Condens. Matter

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We present calculations and experimental measurements of the temperature-dependent magnetization of a single crystal of GdCo in magnetic fields of order 60 T. At zero temperature the calculations, based on density-functional theory in the disordered-local-moment picture, predict a field-induced transition from an antiferromagnetic to a canted alignment of Gd and Co moments at 46.1 T. At higher temperatures the calculations find this critical field to increase along with the zero-field magnetization. The experimental measurements observe this transition to occur between 44-48 T at 1.4 K. Up to temperatures of at least 100 K, the experiments continue to observe the transition; however, at variance with the calculations, no strong temperature dependence of the critical field is apparent. We assign this difference to the inaccurate description of the zero-field magnetization of the calculations at low temperatures, due to the use of classical statistical mechanics. Correcting for this effect, we recover a consistent description of the high-field magnetization of GdCo from theory and experiment.

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AFM SURFACE ANALYSIS OF Fe-Co-Mo ELECTROLYTIC COATINGS

Abstract: The study aims at the investigation of the morphology and topography of the ternary

Cited by 4 publications

References 12 publications

Calculating the Magnetic Anisotropy of Rare-Earth–Transition-Metal Ferrimagnets

Calculating the Magnetic Anisotropy of Rare-Earth–Transition-Metal Ferrimagnets

Research into influence of the electrolysis modes on the composition of galvanic Fe-Co-Mo coatings

Field-induced canting of magnetic moments in GdCo₅ at finite temperature: first-principles calculations and high-field measurements

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AFM SURFACE ANALYSIS OF Fe-Co-Mo ELECTROLYTIC COATINGS

Abstract: The study aims at the investigation of the morphology and topography of the ternary

Cited by 4 publications

References 12 publications

Calculating the Magnetic Anisotropy of Rare-Earth–Transition-Metal Ferrimagnets

Calculating the Magnetic Anisotropy of Rare-Earth–Transition-Metal Ferrimagnets

Research into influence of the electrolysis modes on the composition of galvanic Fe-Co-Mo coatings

Field-induced canting of magnetic moments in GdCo5 at finite temperature: first-principles calculations and high-field measurements

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Field-induced canting of magnetic moments in GdCo₅ at finite temperature: first-principles calculations and high-field measurements