Thickness-Dependent Magnetostatic Interactions and Domain State Configuration in Fe2CoSi Thin Films–FORC Analysis

We report on results pertinent to the room temperature first-order reversal curve (FORC) analysis of inverse Heusler alloy Fe
₂
CoSi thin films with different thicknesses (
$t = 5$
, 10, 15, and 20 nm). Our analysis infers that magnetostatic interactions between magnetic grains enhance with an increase in the thickness of Fe
₂
CoSi thin films. Indeed, such results are confirmed with the analysis of switching field distribution (SFD). Single domain (SD) to multi domain (MD) transformation is evidenced as the thickness increases from 5 to 20 nm. SD state is confirmed by symmetric contour around
$B_{u} = 0$
axis, while, multidomain state is affirmed with no central peak and spreading of contour parallel to
$B_{u} = 0$
axis. The change in domain state configuration for different thicknesses might strengthen the application of Fe
₂
CoSi Heusler alloy films for the future spintronic applications.