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Switching the Twist in X Rays with Magnets 2Department of Applied Physics, University of Salamanca, Salamanca, Spain March 15, 2021• Physics 14, 34 Scientists create a pattern of nanomagnets called an artificial spin ice that can control the orbital angular momentum of a scattered x-ray beam. Figure 1: Two strategies for generating orbital angular momentum (OAM) in light. The left side shows a 1D-like microstructure, called a fork-dislocation hologram, which is commonly used to generate OAM beams in visible light. The right side shows a 2D nanomagnet array, called an artificial spin ice, which was used by Woods, Chen, and colleagues to generate x-ray OAM beams. Structural (charge) scattering generates even-order beams (red doughnuts), while magnetic (spin) scattering generates odd-order beams (blue doughnuts).Two strategies for generating orbital angular momentum (OAM) in light. The left side shows a 1D-like microstructure, called a fork-dislocation hologram, which is c

United statesCastillay leópUniversity of colorado at boulderHenry kapteynMargaret murnaneMargaretm murnaneCarlos hernUniversity of californiaUniversity college corkUniversity of colorado boulderDepartment of applied physicsAmerican association for the advancement of scienceUniversity of coloradoAmerican physical societyUniversity of salamancaDepartment of physics