Quantum mechanics

Theoretical physics

Magnetic field

Magnetization

Magnetic domain

Domain wall (magnetism)

Soliton

Computer science

Spins

Classical mechanics

Phenomenon

Physics

Nonlinear system

Mathematics

Optics

Object (grammar)

Speed of light (cellular automaton)

Domain (mathematical analysis)

Condensed matter physics

Mathematical analysis

Artificial intelligence

Geometry

Kinematics

Perspective (graphical)

Mechanics

Theory of relativity

Science

Magnetic special relativity Magnetic materials have domains, patches of ordered spins that are separated from one another by boundaries called domain walls. These boundaries can be driven by electrical currents, a phenomenon forming the basis of the so-called racetrack memories. The speed of the domain walls has steadily increased as experimenters have perfected these devices. Caretta et al. now show experimentally that this speed is fundamentally limited (see the Perspective by Daniels and Stiles). Just as no object can travel faster than the speed of light, the speed of the domain walls saturates to a constant determined only by the properties of the magnetic host material. Science , this issue p. 1438 ; see also p. 1413

Relativistic kinematics of a magnetic soliton