Giant interfacial Dzyaloshinskii-Moriya Interaction in perovskite La0.7Sr0.3MnO₃ films

This is the authors' abstract. We don't add key points for this paper.

The Dzyaloshinskii-Moriya interaction (DMI) plays a critical role in stabilizing topological spin textures, a key area of growing interest in oxide-based spintronics. While most of reported topological phenomena found in manganites are related to the bulk-like DMI, the understanding of interfacial DMI and its origin in oxide interfaces remain limited. Here we experimentally investigate the interfacial DMI of La0.7Sr0.3MnO₃ (LSMO) films grown on various substrates by employing spin-wave propagation with drift velocities at room temperature. Our findings reveal a giant interfacial DMI coefficient (D ₛ) of 1.96 pJ/m in LSMO/NdGaO₃(110) system, exceeding previously reported values in oxides by one to two orders of magnitude. First-principles calculations further show that with the aid of 6s electrons, the 4f electrons from Nd play a key role in enhancing the spin-orbit coupling of the 3d electrons in Mn, ultimately leading to the observed giant interfacial DMI. This discovery of giant interfacial DMI through engineering the interface of oxides provides valuable insights for advancing functional chiral magnonics and spintronics.