Magnetic shape memory alloys, MSMAs, are modern alloys suitable for harvesting waste energy in low-power electrical equipment. This is due to their unique combination of large displacement, rapid mechanical responses, and great actuation capability. In recent years, significant efforts have been made to develop effective technologies for energy harvesting by MSMAs. However, so far, this topic has not been subject to any review. To address this issue, the current study puts forward an overview on the progress and challenges of MSMAs for the usage in a harvesting energy from vibrational, thermal, and acoustic energy sources. An emphasis is put on explaining the different designs of energy harvesting systems that use MSMAs. The review also presents some background information on the MSMAs and their working principles. It eventually identifies some directions for future studies in this field
