Large moments in bcc FexCoyMnz ternary alloy thin films

Abstract

The elemental magnetic moments and the average atomic moment of 10-20 nm thick single crystal bcc (bct) Fe x Co y Mn z films deposited on MgO(001) have been determined as a function of a broad range of compositions. Thin film epitaxy stabilized the bcc structure for 80% of the available ternary compositional space compared to only a 23% stability region for the bulk. The films that display ferromagnetism represent 60% of the available compositional possibilities compared to 25% for the bulk. A maximum average atomic moment of 3.25 6 0.3 l B /atom was observed for a bcc Fe 9 Co 62 Mn 29 film (well above the limit of the Slater-Pauling binary alloy curve of 2.45 l B /atom). The Fe x Co y Mn z ternary alloys that exhibit high moments can only be synthesized as ultrathin films since the bcc structure is not stable in the bulk for those compositions.

Inferface Magnetization Phenomena in Epitaxial Thin Fe3O4/CoxFe3–xO4 Bilayers

“…An additional possible mechanism is local distortion of the unit cell at the interface, which can be facilitated by a concentration of vacancies, for example. Such behavior has been reported in FeCoMn metallic alloys when tetragonal distortions were stabilized in thin films …”

Artificial intelligence for search and discovery of quantum materials

“…Antiferromagnetism-whose role in the superconductivity of several classes of materials is hotly debated-is best probed using neutron scattering 115 . X-ray magnetic circular dichroism has been used to investigate the electronic structure of quantum spin liquid α-RuCl 3 116 These advanced techniques require unique synchrotron or neutron facilities, and their implementation in the screening of combinatorial libraries has been limited to date 117,118 The high-throughput approach generates large highdimensional datasets, requiring analysis techniques that can rapidly turn raw data into knowledge with limited or no human supervision 119 . This community adopted dimensionality reduction and data mining techniques early on [120][121][122][123] , gradually creating a diverse ML toolbox for the rapid digestion of combinatorial data [124][125][126][127][128][129][130] .…”

Evidence-based recommender system and experimental validation for high-entropy alloys

“…Note that out-of-plane XRD measurements were also performed to identify the crystal structure in more detail, as shown in Figure S 7(a) in the Supplementary Information, indicating the formation of a polycrystalline film. Reportedly, the BCC crystal structure of the FeCoMn alloy is stable 35 , and there are no reports in the literature concerning the stability of the crystal structure of Ni-alloyed FeCoMn films. Therefore, to investigate the stability of the crystal structure, the effect of Ni doping on the crystal structure was analyzed based on the heat map generated from the X-ray diffraction patterns of FeCoMn films prepared with various Ni contents (Fig 5 (d)…”