Editorial for focus collection " Multi-physics coupling in nanoscale spintronics and quantum devices ".

In recent years, scientists and engineers from different fields have drawn particular attention to explore physical properties and application of quantum devices. In practical application, the coupling with external field, such as electric field, strain, and temperature, has significant impact on the performance of these devices. We are delighted to provide a Focus Collection with a selection of 13 research articles. These papers present the multi-physics coupling of the electronic, optical, mechanical, magnetic, thermal and topological properties of quantum materials and devices.