“…The study of the field-induced transitions from a ferri-to a ferromagnetic state in the intermetallic compounds is an interesting fundamental problem. Up to now very few forcedferromagnetic states in rare-earth intermetallic compounds with iron were reported [24,27]. In the present work, the measurements were carried out on single-crystalline Tm2Fe17 hydrogenated to the maximum hydrogen content of 5 H atoms per formula unit along the easy magnetization direction in fields up to 60 Т. Hydrogenation allowed us to decrease the Tm-Fe exchange and thus to lower the transition field to the forcedferromagnetic state down to 57 T as compared to about 80 T expected for the parent compound Tm2Fe17 [17].…”
We report the attainment of the ferromagnetic state in an interstitially modified heavy rare-earth-iron intermetallic compound in an external magnetic field. The starting composition is REFe, which is the RE-Fe binary richest in iron. We concentrate on the Tm-Fe compound, which is the most sensitive to magnetic field. The maximum possible amount of hydrogen (5 at.H/f.u.) is inserted into a TmFe single crystal. We demonstrate that in a magnetic field of 57 T TmFeH reaches the ferromagnetic state with an enviably high polarization of 2.25 T.
“…The study of the field-induced transitions from a ferri-to a ferromagnetic state in the intermetallic compounds is an interesting fundamental problem. Up to now very few forcedferromagnetic states in rare-earth intermetallic compounds with iron were reported [24,27]. In the present work, the measurements were carried out on single-crystalline Tm2Fe17 hydrogenated to the maximum hydrogen content of 5 H atoms per formula unit along the easy magnetization direction in fields up to 60 Т. Hydrogenation allowed us to decrease the Tm-Fe exchange and thus to lower the transition field to the forcedferromagnetic state down to 57 T as compared to about 80 T expected for the parent compound Tm2Fe17 [17].…”
We report the attainment of the ferromagnetic state in an interstitially modified heavy rare-earth-iron intermetallic compound in an external magnetic field. The starting composition is REFe, which is the RE-Fe binary richest in iron. We concentrate on the Tm-Fe compound, which is the most sensitive to magnetic field. The maximum possible amount of hydrogen (5 at.H/f.u.) is inserted into a TmFe single crystal. We demonstrate that in a magnetic field of 57 T TmFeH reaches the ferromagnetic state with an enviably high polarization of 2.25 T.
“…A forced ferromagnetic alignment of the heavy RE moments with Fe or Co moments can be induced by the application of a high magnetic field. Such transitions have been studied in RE2Fe14B (RE= Tm and Er) [1,2], ErFe11Ti [3] single crystals, RE2TM17…”
The structural and magnetic properties of Y0.5Er0.5Fe2D4.2 deuteride have been investigated by continuous high field magnetic measurements up to 35 T and neutron powder diffraction experiments versus temperature and applied field. Y0.5Er0.5Fe2D4.2 crystallizes in a monoclinic structure (Pc space group) resulting from the deuterium order into 18 interstitial tetrahedral sites. At low field, the deuteride is ferrimagnetic (Ferri) up to 38 K, between 38 and 50 K, it undergoes a first order transition towards an antiferromagnetic (AFM) structure, which remains present up to TN=115 K. Upon applied field, two different types of metamagnetic behavior are observed depending on the temperature range. Below 38 K, a forced ferrimagneticferromagnetic (FM) transition is observed at a transition field BTrans of only 7 T (at 2 K), which is among the smallest encountered for Fe rich intermetallics. BTrans is not very sensitive to temperature changes nor to the Er content and its moderate value is explained by a deuterium induced weakening of the Er-Fe interaction. The second metamagnetic transition, observed between 38 and 150 K, from an AFM (Para) towards a FM structure, is related to the itinerant electron metamagnetic behavior of the Fe sublattice. BTrans increases linearly versus temperature with a dB/dT slope of 0.24±0.01 T.K-1. Above BTrans, Er moments parallel to the Fe moments are induced.
“…Magnetic fields exceeding 60 T are needed to observe a ferromagnetic state both in the parent and in the nitrided compounds. It was shown earlier that Tm 2 Fe 17 24 and Tm 2 Fe 14 B 21 reach the ferromagnetic state in fields exceeding 80 T. It is clear that nitrogenation enhances the intersublattice exchange interaction in TmFe 11 Ti.Figure 2Magnetization curves of TmFe 11 Ti, TmFe 11 TiH and TmFe 11 TiN measured at 4.2 K in pulsed fields applied along the [001] axis (dots represent measurements in steady magnetic fields).…”
Section: Resultsmentioning
confidence: 97%
“…magnetization all the way up to the forced-ferromagnetic state) in ferrimagnets 20 . A particular advantage is to perform such experiments using thulium compounds, since Tm has the Landé factor closest to unity, which allows reaching the ferromagnetic state in relatively weak magnetic fields 21,22 . The second-order CEF parameter at the 2 a rare-earth site is negative and Tm 3+ having a positive second-order Stevens’ coefficient α J strengthens the uniaxial anisotropy of the Fe sublattice.…”
Rare-earth (R)-iron alloys are a backbone of permanent magnets. Recent increase in price of rare earths has pushed the industry to seek ways to reduce the R-content in the hard magnetic materials. For this reason strong magnets with the ThMn12 type of structure came into focus. Functional properties of R(Fe,T)12 (T-element stabilizes the structure) compounds or their interstitially modified derivatives, R(Fe,T)12-X (X is an atom of hydrogen or nitrogen) are determined by the crystal-electric-field (CEF) and exchange interaction (EI) parameters. We have calculated the parameters using high-field magnetization data. We choose the ferrimagnetic Tm-containing compounds, which are most sensitive to magnetic field and demonstrate that TmFe11Ti-H reaches the ferromagnetic state in the magnetic field of 52 T. Knowledge of exact CEF and EI parameters and their variation in the compounds modified by the interstitial atoms is a cornerstone of the quest for hard magnetic materials with low rare-earth content.
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