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Optical magnetoelectric effect at interfaces as a polar ferromagnet
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View: Figures


Image of FIG. 1.
FIG. 1.

X-ray scan of tricolor superlattice composed of 5 unit cells (u.c.) , , and layers. The inset shows the AFM image of the superlattice, where atomically flat step and terrace structure is clearly seen.

Image of FIG. 2.
FIG. 2.

(a) Temperature , and (b) magnetic field dependences of magnetization normalized by all the constituent magnetic Mn and Ru sites. The curves were measured under a magnetic field (∥ in-plane [100]) of after field cooling. The curves were measured at after cooling under . The samples are solid-solution (CMRO) film (broken line), bicolor superlattice (gray line), and tricolor superlattice (black line).

Image of FIG. 3.
FIG. 3.

(a) Schematics of experimental setup for observing optical magnetoelectric (OME) effect in the tricolor superlattice by Bragg diffraction technique. A grating structure with a period was patterned along the axis of the superlattice, as shown by the AFM image. The intensity of Bragg diffraction was measured under irradiation of a linearly polarized laser with propagation vector and electric field parallel to the and axes, respectively. Magnetic field is applied parallel to the axis. , , and represent polarization and magnetization in the superlattice, and propagation vector of the scattered light, respectively. (b) dependence of OME effect for the patterned tricolor superlattice, evaluated as for the order (blue circles) and (red circles) in reflection (upper panel) and transmission (lower panel) geometries. Conventional curves at are also shown as gray lines. (c) dependence of OME effect for the tricolor superlattice, measured after rotating the patterned superlattice by 180° along the axis.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical magnetoelectric effect at CaRuO3–CaMnO3 interfaces as a polar ferromagnet