Tailoring the ferrimagnetic-to-ferromagnetic transition field by interstitial and substitutional atoms in the R–Fe compounds

Терешина, И. С.; Ivanov, L. P.; Tereshina-Chitrova, E. A.; Gorbunov, D. I.; Paukov, M.; Havela, L.; Drulis, H.; Granovsky, S.A.; Doerr, Markus; Гавико, В. С.; Андреев, А.В.

doi:10.1016/j.intermet.2019.106546

Cited by 20 publications

(5 citation statements)

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“…A second objective of this study was to observe how the hydrostatic pressure influences the Er-Fe interactions. Y0.7Er0.3Fe2D4.2 is ferrimagnetic at low temperature but undergoes a forced ferrimagnetic-ferromagnetic transition at an applied field of 8 T, which compared to other R-Fe systems 21,49 , is remarkably moderate and indicates that D absorption weakens significantly the Er-Fe interactions due to the large increase of Er-Fe distances 38 . In this work, the influence of pressure on Er-Fe interaction was followed through the variation of the Er magnetic ordering temperature TEr under applied pressure.…”

Section: Discussionmentioning

confidence: 92%

Influence of high pressure on the remarkable itinerant electron behavior in Y0.7Er0.3Fe2D4.2 compound

Arnold

Isnard

Paul‐Boncour

2023

Journal of Applied Physics

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A monoclinic Y0.7Er0.3Fe2D4.2 compound exhibits unusual magnetic properties with different field induced magnetic transitions. The deuteride is ferrimagnetic at low temperature, and the Er and Fe sublattices present magnetic transitions at different temperatures. The Er moments are ordered below TEr = 55 K, whereas the Fe moments remain ferromagnetically coupled up to TM0 = 66 K. At TM0, the Fe moments display a sharp ferromagnetic–antiferromagnetic transition (FM–AFM) through itinerant electron metamagnetic behavior very sensitive to any volume change. Y0.7Er0.3Fe2D4.2 becomes paramagnetic above TN = 125 K. The pressure dependence of TEr and TM0 has been extracted from magnetic measurements under hydrostatic pressure up to 0.49 GPa. Both temperatures decrease linearly upon applied pressure with dTEr/dP = −126 and dTM0/dP = −140 K GPa−1 for a field of B = 0.03 T. Both magnetic Er and ferromagnetic Fe orders disappear at P = 0.44(4) GPa. However, under a larger applied field B = 5 T, dTM0/dP = −156 K GPa−1, whereas dTEr/dP = −134 K GPa−1 showing weaker sensitivity to pressure and magnetic field. At 2 K, the decrease of the saturation magnetization under pressure can be attributed to a reduction of the mean Er moment due to canting and/or a crystal field effect. Above TM0, the magnetization curves display metamagnetic behavior from an AFM to FM state, which is also very sensitive to the applied pressure. The transition field Btrans, which increases linearly upon heating, is shifted to a lower temperature upon applied pressure with ΔT = −17 K between 0 and 0.11 GPa. These results show strong decoupling of the Er and Fe magnetic sublattices vs temperature, applied field, and pressure.

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Section: Discussionmentioning

confidence: 92%

Influence of high pressure on the remarkable itinerant electron behavior in Y0.7Er0.3Fe2D4.2 compound

Arnold

Isnard

Paul‐Boncour

2023

Journal of Applied Physics

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“…The parent (Tm0.5Nd0.5)2Fe14B and (Er0.5Nd0.5)2Fe14B compounds have a tetragonal Nd2Fe14B-type crystal structure with lattice parameters a = 0.876 nm, c = 1.206 nm and a = 0.877 nm, c = 1.206 nm, respectively. Figure 1 compares the concentration dependencies of the unit-cell volume of (Tm0.5Nd0.5)2Fe14BHx and Tm2Fe14BHx systems (the latter is adopted from [11]). The V(x) grows linearly with the hydrogen content x while the tetragonal crystal structure type remains preserved in both series.…”

Section: Resultsmentioning

confidence: 99%

“…Single crystals of the parent (Tm0.5Nd0.5)2Fe14B and (Er0.5Nd0.5)2Fe14B compounds were grown by a modified Czochralski method. Afterwards the hydrogenation of the materials was performed [11]. We obtained powder hydrides (Tm0.5Nd0.5)2Fe14BHx (x=1.7; 3; 4 and 5.5) and (Er0.5Nd0.5)2Fe14BHx (x=3; 4.5 and 5.5).…”

Section: Methodsmentioning

confidence: 99%

“…Hydrogenation is beneficial not only to TC (increasing it dramatically) in R2Fe14B but also to the experiment on the magnetization study itself. Hydrogenation usually decreases the inter-sublattice R-Fe exchange and thus lowers the transition fields [11]. Besides, it is advantageous to perform experiments on the Tm-containing compounds since thulium has a Landé factor closest to unity and it needs the smallest magnetic field to reach the field-induced ferromagnetic state [8,12].…”

Section: Introductionmentioning

confidence: 99%

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Nanopowders of R2Fe14B-type compounds in high magnetic fields: The effects of substitutional and interstitial atoms on inter-sublattice exchange interaction

Paukov

Ivanov

Терешина

et al. 2020

METAL 2020 Conference Proeedings

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The fundamental magnetic characteristics of R2Fe14B intermetallics are highly sensitive to atomic substitutions and interstitial absorption of light elements. In this work, both were combined, and the influence of the substitutions in the R-sublattice and hydrogen absorption on the magnetization of (RR')2Fe14BHx (R is Tm or Er, and R' is Nd) in magnetic fields up to 58T was studied. (Tm0.5Nd0.5)2Fe14B and (Er0.5Nd0.5)2Fe14B were prepared. By using direct hydrogen absorption, (R0.5Nd0.5)2Fe14BHx compounds were obtained with hydrogen content 0≤x≤5.5. Magnetic measurements of both the parent alloys and their hydrides were carried out on nanopowders. The strength of the inter-sublattice coupling in (Tm0.5Nd0.5)2Fe14B, (Er0.5Nd0.5)2Fe14B and their hydrides is estimated by analysing high-field magnetization data. Itis shown that hydrogenation weakens the inter-sublattice exchange interaction up to 45 %. (Tm0.5Nd0.5)2Fe14B, with the maximum hydrogen content of 5.5 at.H/f.u., reaches the field-induced ferromagnetic state at about 55 T.

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“…Терёшина, А.А. Курганская... [16]. Таким образом, варьируя содержание кремния и водорода, можно получить набор материалов с оди-наковым магнитокалорическим эффектом, но разными значениями T C и T max .…”

unclassified

Новые магнитные материалы на основе соединений RNi для криогенной техники

Chzhan¹,

Терёшина²,

Курганская³

et al. 2020

Письма В Журнал Технической Физики

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Magnetocaloric properties of compounds Gd(Ni0.98Si0.02), Dy(Ni0.95Si0.05) and their hydrides Gd(Ni0.98Si0.02)H3, Dy(Ni0.95Si0.05)H4 were investigated in the temperature range 2 – 100K. It was found that partial substitution of Ni atoms by Si atoms, as well as subsequent hydrogenation can lead to a significant change in the Curie temperature (TC), the magnetocaloric effect, and the temperature at which the maximum MCE (Tmax) is observed. It is shown that the TC and Tmax of the hydrides are shifted by several degrees to the low temperature region with increasing or maintaining the MCE, which can significantly expand the application of such materials in cryogenic engineering.

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Tailoring the ferrimagnetic-to-ferromagnetic transition field by interstitial and substitutional atoms in the R–Fe compounds

Cited by 20 publications

References 30 publications

Influence of high pressure on the remarkable itinerant electron behavior in Y0.7Er0.3Fe2D4.2 compound

Influence of high pressure on the remarkable itinerant electron behavior in Y0.7Er0.3Fe2D4.2 compound

Nanopowders of R2Fe14B-type compounds in high magnetic fields: The effects of substitutional and interstitial atoms on inter-sublattice exchange interaction

Новые магнитные материалы на основе соединений RNi для криогенной техники

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