2D materials immersed into a non-uniform, profiled magnetic field can focus THz light. This opens the door to novel magnetically-tunable lenses for ultrafast applications.

We propose a new mechanism and a related device concept for a robust, magnetic field tunable radio-frequency (rf) oscillator using the self oscillation of a magnetic domain wall subject to a uniform static magnetic field and a spatially non-uniform vertical dc spin current. The self oscillation of the domain wall is created as it translates periodically between two unstable positions, one being...

I.._._& .".^^I --.----.--.: ~ . . ~ ~ . ~ ~ . . ~ ~ I l . l ~ ~ . ~ ~ ~ ~ I ~ ~ ~ ~ I _ L ~ ~ -,.~-~ ..: fiML..CI. lllr rrrru".aiglLso* plupcrocr "I m s LUrVlUa, SDlenOl" W l l " an allsmarlng sYrrsI11 are discussed. The multipole expansion for the electromagnetic field of the toroidal solenoid is obtained and explicit expressions for the toroidal form factors and moments are given. Concrete re...

2 A General Firstand Second-Order Theory of Beam Transport Optics . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 The Vector Differential Equation of Motion . . . . . . . . 2.2 The Coordinate System . . . . . . . . . . . . . . . . .’ . 2.3 Expanded Form of a Magnetic Field Having Median Plane Symmetry . . . . . . . . . . . . . . . . . . . . . . 2.4 Field Expansion to Second Order Only ....