Quantum rare-earth-based materials comprise a number of materials with anomalous properties and characteristics which make them promising for spintronic and energy-harvesting applications. Magnetic and transport properties of rare-earth- and gadolinium-based intermetallics are reviewed. Magnetocaloric materials based on gadolinium, transition metals T and p elements X provide high efficiency, reliability and environmental safety in devices for magnetic cooling and others. The unique combination of metallic and ceramic properties, including simultaneous electrical/thermal conductivity, exceptional damage tolerance, high-temperature strength retention, and low density, were found in MAX phase with Мn+1АХn. These ceramic-metallic hybrids combine alternating layers of transition metal carbide/ nitride sheets that has driven significant scientific interest. Advanced functionalities, such as self-healing capabilities, reversible deformation behavior, and recently discovered magnetic properties further expand their potential applications.