Two-Tier Magnetic Material Strategy for Metric Engineering: From the Rare-Earth-Free (Fe0.92Co0.08)2(P0.78Si0.22) Gap Magnet to the HeliFe-MADA Architecture for the GU-RVG Framework

The realization of the Geometric Unity–Refractive Vacuum Gravity (GU-RVG) synthesis as a deployable aerospace technology is bounded fundamentally by materials science. The recursive Magnetic Amplification and Direction Assembly (MADA) demands a physical substrate capable of sustaining absolute South-South (or North-North) pole opposition across a comparatively wide central gap and forcing the resulting frustrated flux across 10–100 μm micro-gaps within a targeted laminated magnetic-circuit wall, where 0. 15–0. 35 mm laminations separated by micron-scale dielectric interlayers generate microscopic gradient singularities in ∇ (B·B). These singularities trigger dilaton condensation and couple the boundary helicity to the topological Chern-Simons terms of the 14-dimensional Observerse. In a deployed airframe, multiple MADA arrays are AI-controlled and mechanically gimbaled within large, heavy spherical, discoidal, or cylindrical laminated magnetic circuits; the net thrust vector is directed antiparallel to the vector sum of the array-targeted points on the interior wall of the surrounding magnetic circuit, and the propulsive force is the macroscopic integral of the microscopic ∇ (B·B) singularities developed within the circuit's targeted laminations. The Scalar-Hydraulic Drive (SHD) and the Asymmetric Dilaton Pump Generator (ADPG) both employ partially-hybridized MADA arrays—permanent-magnet cores augmented by embedded pulsing coils and servo-driven flux-shunting irises—differing not in their underlying MADA topology but in which asymmetry, spatial or temporal, drives the metric coupling and in whether the unit is configured for propulsion or stationary energy extraction. Conventional materials fail along two physically distinct roles. As candidate magnetic materials—the hard, permanent-magnet substrate—neodymium-iron-boron (Nd₂Fe₁₄B) is geopolitically constrained and metastable α''-Fe₁₆N₂ decomposes above 250°C. As candidate magnetic-circuit materials—the soft, high-permeability return-yoke and flux-shunting-iris substrate—commercial Hiperco-50 (Fe-49Co-2V) is thermally robust but limited to Js ≈ 2. 4 T, and Minnealloy, the soft Fe-N-family alloy chemically related to but functionally distinct from α''-Fe₁₆N₂, shares the same < 250°C metastability ceiling. We propose a complementary two-tier material strategy in which the differentiator is material cost and manufacturing difficulty, not subsystem function: both tiers are valid in both SHD and ADPG hardware, and the choice between them is determined by deployment context and economics. Tier I is the rare-earth-free iron-phosphide alloy FePSi, supplemented by 0. 5–2. 0 at. % trace pinning additions of manganese or aluminum. Cobalt site substitution lifts the Curie temperature beyond 500 K, silicon doping maximizes the uniaxial magnetocrystalline anisotropy to K₁ ≈ 1. 09 MJ/m³ and suppresses the first-order magnetoelastic transition of binary Fe₂P, and high-energy ball milling followed by Spark Plasma Sintering produces sub-micron core-shell grains with intrinsic coercivity Hcj = 5–12 kOe and energy product (BH) max ≈ 180 kJ/m³ (≈ 22. 6 MGOe). Tier I addresses only the magnetic-material role; Tier I airframes pair the FePSi pole magnets with a separate soft-yoke substrate—typically Hiperco-50—to complete the MADA flux circuit. Tier I is intended for global civilian and commercial deployment—"everyone on Earth"—in mass-produced MADA arrays where the volumetric cost-per-magnet must be bounded by commodity rock-forming elements. Tier II is the HeliFe architecture, a chirally-doped, interstitially-nitrogenated ThMn-type exchange-spring nanocomposite of nominal stoichiometry Nd₀. ₀₅ (Fe₀. ₆₈Co₀. ₁₇V₀. ₀₅) ₁₁. ₅N₀. ₀₅ with trace Pt/Ir/Mn, which transcends the Slater-Pauling barrier through the magnetovolume effect to reach Js ≈ 2. 7 T while intrinsically generating macroscopic magnetic helicity Hm ≠ 0 via engineered Dzyaloshinskii-Moriya interactions, with theoretical (BH) max approaching 1450 kJ/m³ (~ 182 MGOe). Tier II is fabricated by magnetic field-assisted laser powder-bed fusion (MF-L-PBF) with monolithic ceramic interlayer lamination and post-consolidation inductively-coupled-plasma nitrogenation, yielding functionally-graded soft-yoke/hard-pole geometries. Tier II addresses both roles within a single monolithic build: the same MF-L-PBF process produces the hard nitrogenated ThMn pole tips (magnetic-material role) and the coarsened soft bcc Fe-Co return yokes (magnetic-circuit-material role), eliminating the dissimilar-material joint required of Tier I airframes. This premium tier is intended for exquisite military and intelligence platforms and for high-end consumer applications where saturation, intrinsic chirality, and pulsed-burst tolerance must be maximized regardless of unit cost. The Master Equation of Levitation Fₗift = ∫V (1/2μ₀) Dilatondilaton (B) ∇ (B·B) dV is satisfied by either tier; together they span the full economic-deployment spectrum of the GU-RVG hardware program.