The　saturation　magnetization　strength　(Ms)　of　magnetic　media　is　a　core　parameter　for　mineral　separation.　However,　imprecise　cross-scale　links　between　magnetic　mechanisms　and　responses,　along　with　limited　detection　of　internal　magnetization　and　composition,　which　poses　an　urgent　need　for　the　optimization　of　the　properties　of　such　materials.　This　study　used　first　principles　calculations　and　micromagnetic　simulation　methods　to　analyze　enthalpies　of　formation,　lattice　constants,　Ms,　electronic　density　of　states,　and　dynamic　magnetic　domain　wall　properties　(Tdw,　BPw,　VAVdw)　of　FeCo　based　soft　magnetic　alloys.　The　results　show　that　as　the　Co　content　increases,　the　enthalpy　of　formation　increases.　When　the　Co　content　is　less　than　30%,　the　alloy　has　a　stable　system.　The　antiferromagnetism　of　Cr　suppresses　the　average　magnetic　moments,　and　cancels　out　the　ferromagnetic　magnetic　moments　of　Fe　and　Co.　It　is　shown　that　Co　atoms　directly　replace　larger　atoms,　resulting　in　a　solid　solution　strengthening　effect,　thus　increasing　the　strength　and　hardness　of　the　material.　Based　on　these　computational　parameters,　this　micromagnetic　simulation　reveals　the　sequential　transformation　of　magnetic　domain　structure　from　single-vortex　core　state　to　multiple-vortex　core　state　during　the　forward　and　reverse　magnetization　of　FeCo　based　soft　magnetic　alloy　in　the　Axial　and　radial　at　low　Co　content,　and　shows　that　the　axial　is　easier　to　be　magnetized　than　the　radial,　and　it　has　high　coercivity　and　high　remanent　magnetization.　The　results　of　these　simulations　were　be　validated　using　a　vibrating　sample　magnetometer　(VSM).　To　guide　the　design　of　FeCo　based　soft　magnetic　alloys　with　high　Ms　and　toughness　for　efficient　recovery　of　weakly　magnetic　minerals　in　high-gradient　magnetic　separators.　©　2025　Elsevier　Ltd