Room‐Temperature Spontaneous Topological (Anti)Merons Induced by Magnetoelastic Coupling

ABSTRACT Topologically protected magnetic (anti)merons have garnered widespread attention owing to their promising potential use as long‐range information carriers in spintronic devices. However, (anti)merons usually emerge only within a narrow temperature range below room temperature and/or under an external magnetic field, hindering the development of such applications. Here, we report the direct observation of spontaneous isolated (anti)meron pairs and (anti)meron chains without the need for external magnetic fields over a wide temperature range across room temperature (313–80 K) in a Fe 2 P‐type Mn‐Fe‐P‐Si material with easy‐plane magnetic anisotropy. Spontaneous isolated (anti)meron pairs are induced by a magnetoelastic transition from a paramagnetic to ferromagnetic state and subsequently evolve into (anti)meron chains upon cooling. These spontaneous (anti)merons exhibit distinct processes of creation, movement, and annihilation in response to variations in temperature and magnetic field, demonstrating their controllability. Through a combination of first‐principles calculations, neutron powder diffraction, and micromagnetic simulations, we reveal that easy‐plane magnetic anisotropy plays a pivotal role in the spontaneous generation and stabilization of topological (anti)merons in this system. Our findings provide an alternative way to generate spontaneous topological spin textures utilizing easy‐plane magnetic anisotropy and magnetoelastic transition, and establish magnetoelastic coupling materials as a versatile platform for future spintronics devices.