Temperature and angle dependence of magnetic damping in manganite thin films

Abstract Magnonics and magnonic materials have attracted widespread interest in spintronic community and demonstrate potential for applications in the next generation of information technology. Recent advances in manganite thin films highlight their promise for magnonics, where enhanced film quality and strain control of spin/electronic structures play a crucial role in reducing magnetic damping. Here, we report the fabrication of La 0.67 Sr 0.33 MnO 3 thin films with different quality via pulsed laser deposition. The quality of epitaxial films is characterized using atomic force microscopy and X-ray diffraction. A pronounced fourfold anisotropy in the magnetic damping (with a ratio of 150%) is observed, where the minimum damping occurs along [110] crystalline orientation. Notably, improved sample quality significantly suppresses the magnetic damping at low temperatures. The highest-quality sample, featuring atomic-scale terraces, exhibits a magnetic damping of ~ 2.5×10 -3 at 5 K. Our results not only demonstrate effective reduction of low-temperature magnetic damping in highquality correlated oxide systems but also provides a strategy and material platform for the explorations of novel quantum phenomenon and designing low-temperature magnonic devices.