This book presents the foundational concepts of spinel nano-ferrites, their synthesis techniques, and their cutting-edge applications in various fields. The book begins with an introduction to spinel nano-ferrites, discussing their unique properties and historical context. It then delves into various synthesis techniques, such as sol-gel methods, co-precipitation, and hydrothermal processes, highlighting the influence of these methods on the resultant structures and morphologies. The book also reviews the electrical and magnetic characteristics of spinel nano-ferrites, demonstrating their potential in electronic and magnetic devices. The role of spinel nano-ferrites in the health sector is explored in depth, detailing their use as antibacterial and antifungal agents and their innovative applications in magnetic resonance imaging (MRI), cancer detection, targeted drug delivery, and hyperthermia treatment. The chapters further examine the environmental applications of spinel nano-ferrites, including their effectiveness in pollution remediation, water purification, dye degradation, and the detection and removal of heavy metal ions and microplastics from wastewater. Toward the end, the book explores the development of gas sensors and humidity sensors using spinel nano-ferrites, as well as devices designed for human and environmental safety. This book is intended for researchers and students of nanotechnology, nanobiotechnology, healthcare professionals, and environmental scientists.Key Features: Covers foundational concepts, unique properties, and cutting-edge applications of spinel nano-ferrites Explores various synthesis methods such as sol-gel, co-precipitation, and hydrothermal processes, and their impact on structures and morphologies of spinel nano-ferrites Discusses the electrical and magnetic characteristics of spinel nano-ferrites Examines the potential of spinel nano-ferrites as antibacterial and antifungal agents, and their roles in MRI, cancer detection, and drug delivery Highlights the effectiveness of spinel nano-ferrites in pollution remediation, water purification, and dye degradation