Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd 1 − x Pt x Mo 3 N
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Kautzsch, Linus (ORCID:000000031999436X)↗
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Materials Data on FePd by Materials Project
FePd is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Fe is bonded to four equivalent Fe and eight equivalent Pd atoms to form distorted FeFe4Pd8 cuboctahedra that share corners with twelve equivalent FeFe4Pd8 cuboctahedra, edges with eight equivalent FeFe4Pd8 cuboctahedra, edges with sixteen equivalent PdFe8Pd4 cuboctahedra, faces with eight equivalent PdFe8Pd4 cuboctahedra, and faces with ten equivalent FeFe4Pd8 cuboctahedra. All Fe–Fe bond lengths are 2.72 Å. All Fe–Pd bond lengths are 2.69 Å. Pd is bonded to eight equivalent Fe and four equivalent Pd atoms to form distorted PdFe8Pd4 cuboctahedra that share corners with twelve equivalent PdFe8Pd4 cuboctahedra, edges with eight equivalent PdFe8Pd4 cuboctahedra, edges with sixteen equivalent FeFe4Pd8 cuboctahedra, faces with eight equivalent FeFe4Pd8 cuboctahedra, and faces with ten equivalent PdFe8Pd4 cuboctahedra. All Pd–Pd bond lengths are 2.72 Å.
36 MATERIALS SCIENCE↗
Microstructural, Magnetic Anisotropy, and Magnetic Domain Structure Correlations in Epitaxial FePd Thin Films with Perpendicular Magnetic Anisotropy
L1(sub 0)-ordered FePd epitaxial thin films were prepared using dc magnetron sputter deposition on MgO (001) substrates. The films were grown with varying thickness and degree of chemical order to investigate the interplay between the microstructure, magnetic anisotropy, and magnetic domain structure. The experimentally measured domain size/period and magnetic anisotropy in this high perpendicular anisotropy system were found to be correlated following the analytical energy model proposed by Kooy and Enz that considers a delicate balance between the domain wall energy and the demagnetizing stray field energy.
Skuza, J. R.↗
Structural Phase Transitions in the van der Waals Ferromagnets Fe x Pd y Te 2
Two-dimensional van der Waals (vdW) magnets are attracting significant attention, both as platforms for studying fundamental magnetic interactions and for the exciting possibility of utilizing them as building blocks in devices and heterostructures, which may lead to new physical phenomena and functionalities. Here, we provide a detailed study of the crystal structure and physical properties of the recently discovered vdW ferromagnet FePd 2 Te 2 . We find this compound has a relatively wide width of formation, and grow single crystals with compositions Fe x Pd y Te 2 where x ranges from 0.9 to 1.1 and y from 1.8 to 2.5, respectively. Temperature-dependent X-ray diffraction and transport measurements reveal that a first-order structural transition occurs in the range of T = 360–420 K, where the critical temperature, modulation wave vector, and corresponding room-temperature crystal structures all depend on chemical composition. Above the transition, the compounds with Pd fraction y > 2 adopt a disordered derivative of the tetragonal FeTe structure, with the Fe layer showing mixed Fe/Pd occupancy and the extra Pd atoms partially occupying interstitial sites. Below 370 K, the structure is incommensurately modulated, likely associated with the complex ordering of Pd/Fe atoms in the metal layers or the interstitial Pd in the vdW gaps. For y < 2, the composition Fe 1.1 Pd 1.8 Te 2 has monoclinic symmetry at room temperature that is consistent with the reported structure of FePd 2 Te 2 . This phase undergoes a structural transition at 420 K for which the high temperature structure is yet to be determined; however, based on the similarities with the y > 2 compounds, we speculate that its T > 420 K structure is also tetragonal. Importantly, the high temperature, symmetry-breaking structural transition observed here provides a likely explanation for the origin of the structural domains previously observed in FePd 2 Te 2 . All compounds investigated in the Fe x Pd y Te 2 series show metallic behavior, with magnetic characterization indicating that they are easy-plane, hard, ferromagnets with T C spanning 98–180 K. Both the critical temperature for the structural transition and the Curie temperature are moderately suppressed with increasing Pd fraction y and corresponding decreasing Fe fraction x, indicating that synthetic control over x and y paves way for the further exploration of these compounds.
crystal structure↗
Degradation of TATP, TNT, and RDX using mechanically alloyed metals
Bimetallic alloys prepared in a ball milling process, such as iron nickel (FeNi), iron palladium (FePd), and magnesium palladium (MgPd) provide in situ catalyst system for remediating and degrading nitro explosive compounds. Specifically, munitions, such as, 2,4,6-trinitrotoluene (TNT), cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX), nitrocellulose and nitroglycerine that have become contaminants in groundwater, soil, and other structures are treated on site to remediate explosive contamination.
Clausen, Christian↗