Domain wall moving type spatial light modulator inspection device and initial domain magnetic field deriving device of domain wall moving spatial light modulator

摘要

Problem to be solved: to reduce the inspection time of the element in the domain wall type optical modulating element. An external magnetic field having a size suitable for antiparallel of the device magnetization direction is derived.A light modulating section that changes the direction of polarization of an incident light and emits light, andDisposed at both ends of the light modulator.First and second ferromagnetic exchange coupling portions having different coercivities for each otherAndThe first and second ferromagnetic exchange coupling portionsA first ferromagnetic layer of ferromagnetic material andFormed on the first ferromagnetic layerA ferromagnetic material comprising ferromagnetic material and a ferromagnetic layerAn inspection apparatus 4 of a domain wall type spatial light modulator 100 comprising a domain wall type optical modulating element having a magnetic domain wallAn external magnetic field applying device 40 for applying an external magnetic field to a domain wall moving spatial light modulator andA magneto optic microscope 5 capable of observing the magnetization direction of a domain wall type spatial light modulator with an external magnetic field applied theretoAn image processing part 6 for processing a photographing image by the magneto-optical microscope 5 and.Diagram