Tuning the magnetic and structural properties of a three-metal boride alloy: Mn0.95−Fe1.05+−Co B

Abramchuk, Mykola; Mier, Thomas; Tafti, Fazel

doi:10.1016/j.jallcom.2019.07.119

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…6C confirm a uniform distribution of Cr, Cl, Br, and I atoms in a CrCl 0.8 Br 1.2 I 1.0 crystal and rule out a phase separation scenario. In materials with impurity phases or inhomogeneous distribution of elements, the color maps reveal regions of dark and light shade (23). A table of EDX results is reported in the Supplementary Materials.…”

Section: Transitionmentioning

confidence: 99%

Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets

et al. 2020

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Van der Waals (VdW) materials have opened new directions in the study of low dimensional magnetism. A largely unexplored arena is the intrinsic tuning of VdW magnets toward new ground states. Chromium trihalides provided the first such example with a change of interlayer magnetic coupling emerging upon exfoliation. Here, we take a different approach to engineer previously unknown ground states, not by exfoliation, but by tuning the spin-orbit coupling (SOC) of the nonmagnetic ligand atoms (Cl, Br, I). We synthesize a three-halide series, CrCl3 − x − yBrxIy, and map their magnetic properties as a function of Cl, Br, and I content. The resulting triangular phase diagrams unveil a frustrated regime near CrCl3. First-principles calculations confirm that the frustration is driven by a competition between the chromium and halide SOCs. Furthermore, we reveal a field-induced change of interlayer coupling in the bulk of CrCl3 − x − yBrxIy crystals at the same field as in the exfoliation experiments.

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Section: Transitionmentioning

confidence: 99%

Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets

et al. 2020

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“…In several cases, the results on (Fe 1−x Co x ) 2 B alloys were the effect of synergy between experiment and theory [11,12,15]. Finally, also a number of related boride phases, such as Co 2−x Mn x B, (Fe x Co 1−x ) 3 B, and Mn 0.95−δ Fe 1.05−δ−x Co x B [21][22][23], have been studied recently to tune their magnetic properties. In this work, we investigate the rare-earth-free magnet (Fe 0.7 Co 0.3 ) 2 B and alloys substituted with Re and W. The Co content and the type of dopant elements were predicted in a previous study [11] in which one of us participated.…”

Section: Introductionmentioning

confidence: 93%

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Musiał¹,

Marciniak²,

Z.³

et al. 2021

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Fe,Co) 2 B-based compounds with specified 5d substitutions are considered as promising materials for permanent magnets without rare-earth elements. We conducted a combined first-principles and experimental study focused on (Fe 0.7 Co 0.3 ) 2 B alloys doped with W and Re. First, we used fullpotential local-orbital scheme to systematically investigate (Fe,Co) 2 B alloys with 3d, 4d, and 5d substitutions. Computational analyses showed a significant increase in magnetocrystalline anisotropy only for the Re doped sample. Simultaneously, the structural and magnetic properties of the (Fe 0.7−x Co 0.3−x M 2x ) 2 B (M = W, Re; x = 0, 0.025) alloys were investigated experimentally. The desired (Fe,Co) 2 B tetragonal phase was synthesized by heat treatment of amorphous precursors. We observed that isothermal annealing increases the coercive field of all samples. However, the obtained values, without further optimization, are well below the threshold for permanent magnet applications. Nevertheless, annealing of substituted samples at 750 o C significantly improves saturation magnetization values. Furthermore, Mössbauer spectroscopy revealed a reduction of the hyperfine field due to the presence of Co atoms in the (Fe,Co) 2 B phase, where additional defect positions are formed by Re and W. Radio-frequency Mössbauer studies showed that (Fe 0.7 Co 0.3 ) 2 B and the W-substituted sample began to crystallize when exposed to an radio frequency field of 12 Oe, indicating that the amorphous phase is stabilized by Re substitution. Improvement of thermal stability of (Fe 0.675 Co 0.275 Re 0.05 ) 2 B alloy is consistent with the results of differential scanning calorimetry and thermomagnetic measurements.

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“…6(c) confirm a uniform distribution of Cr, Cl, Br, and I atoms in a CrCl 0.8 Br 1.2 I 1.0 crystal and rule out a phase separation scenario. In materials with impurity phases or inhomogeneous distribution of elements, the color maps reveal regions of dark and light shade (23). A table of EDX results is reported in the SM.…”

Section: Metamagnetic Transitionmentioning

confidence: 99%

Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets

Tartaglia,

Tang,

Lado

et al. 2020

Preprint

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Van der Waals (VdW) materials have opened new directions in the study of low dimensional magnetism. A largely unexplored arena is the intrinsic tuning of VdW magnets toward new ground-states. The chromium trihalides provided the first such example with a change of inter-layer magnetic coupling emerging upon exfoliation. Here, we take a different approach to engineer new ground-states, not by exfoliation, but by tuning the spin-orbit coupling (SOC) of the non-magnetic ligand atoms (Cl,Br,I). We synthesize a three-halide series, CrCl 3−x−y Br x I y , and map their magnetic properties as a function of Cl, Br, and I content. The resulting triangular phase diagrams unveil a frustrated regime near CrCl 3 . First-principles calculations confirm that the frustration is driven by a competition between the chromium and halide SOCs. Furthermore, we reveal a field-induced change of inter-layer coupling in the bulk of CrCl 3−x−y Br x I y crystals at the same field as in the exfoliation experiments.

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Tuning the magnetic and structural properties of a three-metal boride alloy: Mn0.95−Fe1.05+−Co B

Cited by 7 publications

References 20 publications

Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets

Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets

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