Magnetism Overview - Concepedia

Principles

Definition

Magnetism is a fundamental concept and research area in physics investigating magnetic fields, their sources in electric currents and materials, and their interactions with matter. This field explores phenomena such as attraction, repulsion, and induction, and is essential for understanding fundamental forces, material properties, and numerous technological applications.

Ontological type

Fundamental Principles

Technological Applications

Theoretical Frameworks

Key developments

Key Figures

Exchange Foundations era

E.P. Wohlfarth[1] was a central figure in the Exchange Foundations era, with affiliations at the Weizmann Institute of Science[3] and Imperial College London[4]. He contributed by presenting a mechanism of magnetic hysteresis in heterogeneous alloys[7], linking microstructural disorder to macroscopic magnetic behavior and thereby underpinning early exchange-based explanations of magnetic order in this era. T. Kasuya[2] contributed a theoretical framework for metallic ferro- and antiferromagnetism on Zener's model[8], with stints at Tufts University[5] and The University of Osaka[6]. His 1956 paper A Theory of Metallic Ferro- and Antiferromagnetism on Zener's Model[8] provided a quantum-mechanical footing for exchange interactions in metals and ferrimagnetic/antiferromagnetic ordering, shaping the theoretical landscape of the Exchange Foundations era.

Spintronics and Nanostructures era

S. Das Sarma [1] is associated with Harvard University [3] and the University of California, Santa Barbara [4] in the spintronics and nanostructures era. His contributions to spin-dependent transport and mesoscopic phenomena, as captured in Spintronics: Fundamentals and applications [7], helped lay the groundwork for device-ready spintronic concepts. Jaroslav Fabian [2] is associated with the University of Maryland, College Park [5] and the State University of New York [6] in this era. Fabian [2]'s key contributions include theoretical work on spin relaxation and spin-dependent transport in nanoscale systems, as discussed in Spintronics: Fundamentals and applications [7], which helped establish essential concepts for spin transport in devices during this era.

Engineered Magnetic Textures era

J. F. Scott[1], affiliated with Yale University[3] and the University of Cambridge[4], is a key figure in this era. He advanced the understanding of multiferroic and magnetoelectric materials, as highlighted by the 2006 paper Multiferroic and magnetoelectric materials[7], which helped establish electric-field control of magnetism and design-driven tunability of magnetic properties in engineered textures. Wang Yao[2], affiliated with University of California, San Diego[5] and the University of Minnesota[6], has contributed to layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit[8]. This work illustrates how the ideas from these papers can be leveraged for deterministic control of textures in devices, aligning with the era's goals of tunability and integration.