Spintronics: A historical perspective on the interplay between fundamental research and industrial innovation

The discovery of Giant Magnetoresistance (GMR) in 1988 marked the birth of spintronics by demonstrating that the electron spin could be exploited as an active degree of freedom in electronic devices. Over the following four decades, spintronics evolved from a scientific curiosity into a major technological platform underpinning hard-disk drive read heads, magnetic sensors and embedded non-volatile memories, while continuously generating new concepts at the frontier of condensed-matter physics. Rather than providing an exhaustive review of the field, this Perspective examines the history of spintronics through a succession of paradigm shifts that progressively redefined the physical principles governing spin-dependent phenomena and their technological exploitation. Beginning with the discovery of GMR and its transformation into an industrial technology through spin engineering, we discuss the emergence of tunnel magnetoresistance, spin-transfer torque, spin-orbitronics, chiral spintronics and orbitronics, highlighting how each conceptual advance both addressed the limitations of previous approaches and opened new scientific and technological opportunities. We then discuss the major trends currently shaping the field and reflect on the lessons learned from four decades of translating fundamental discoveries into industrial technologies. The history of spintronics demonstrates that transformative innovations arise from the continuous interplay between fundamental physics, materials science, interface engineering and technological needs. This remarkable ability to reinvent itself has enabled spintronics to remain at the forefront of both condensed-matter research and information technology, and continues to offer fertile ground for future scientific discoveries and technological breakthroughs.