Nonlinear optical detection of mesoscopic magnetic toroidal dipoles
APPLIED PHYSICS LETTERS(2022)
摘要
A vortex-like magnetic state with zero net magnetization-called a magnetic toroidal dipole (MTD)-exhibits a variety of fascinating magnetoelectric (ME) cross-coupling functionalities. However, designing and controlling MTDs in conventional crystals remains challenging. Here, we fabricated a model system of mesoscopic MTDs using planar patterned nanomagnets. By exploiting a symmetry-resolved nonlinear optical technique, we directly detected mesoscopic MTDs whose magnitude and direction are well-controlled using external magnetic fields. This approach may provide a guide for the design and control of nanoscopic-to-mesoscopic functional ME materials working at room temperature.& nbsp;Published under an exclusive license by AIP Publishing.
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关键词
nonlinear optical detection,magnetic
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