Thickness‐Tailored Magnetic Textures and Spin–Orbit Torque in Antiperovskite Mn 3+ x Sn 1– x N

In antiperovskite antiferromagnets, film‐thickness‐modulated interplay between composition and magnetic ordering affords exceptional tunability of spin texture and spin‐transport properties. Here, we systematically investigate the thickness‐dependent magnetic textures and the spin‐orbit torque (SOT) switching mechanism in . Structural and magnetic characterization indicates an evolution of the magnetic texture from non‐collinear antiferromagnetic (NC‐AFM) to ferrimagnetic with increasing film thickness. This transition is marked by polarity reversal in the anomalous Hall effect at a critical thickness of 25–30 nm. Correspondingly, the SOT switching polarity also reverses, accompanied by distinct field‐dependent behaviors: NC‐AFM‐dominant samples require an in‐plane assistant field of 0.3 T to achieve the maximum switching ratio, whereas ferrimagnetic samples require substantially lower fields of 0.03–0.1 T. The switching current density exhibits a non‐monotonic thickness dependence, with optimal efficiency achieved at 30 nm. Critically, Joule heating elevates switching temperatures above the magnetic ordering point, indicating that seeded SOT plays a crucial role in the switching process across all thickness regions. These findings provide fundamental insights into the magnetic texture control for the development of high‐density and low‐power spintronic devices using antiferromagnetic or ferrimagnetic textures.