The formation of ordered magnetic
domains in thin films is important
for the magnetic microdevices in spin-electronics, magneto-optics,
and magnetic microelectromechanical systems. Although inducing anisotropic
stress in magnetostrictive materials can achieve the domain assembly,
controlling magnetic anisotropy over microscale areas is challenging.
In this work, we realized the microscopic patterning of magnetic domains
by engineering stress distribution. Deposition of ferromagnetic thin
films on nanotrenched polymeric layers induced tensile stress at the
interfaces, giving rise to the directional magnetoelastic coupling
to form ordered domains spontaneously. By changing the periodicity
and shape of nanotrenches, we spatially tuned the geometric configuration
of domains by design. Theoretical analysis and micromagnetic characterization
confirmed that the local stress distribution by the topographic confinement
dominates the forming mechanism of the directed magnetization.
Nanogap plasmonic structures with strong coupling between separated components have different responses to orthogonal-polarized light, giving rise to giant optical chirality. Here, we proposed a three-dimensional (3D) nanostructure that consists of two vertically and twistedly aligned nanogaps, showing the hybridized charge distribution within 3D structures. It is discovered that the structure twisted by 60°exhibits plasmonic coupling behavior with/without gap modes for different circular-polarized plane waves, showing giant chiral response of 60% at the wavelength of 1550 nm. By controlling the disk radius and the insulator layer, the circular dichroism signal can be further tuned between 1538 and 1626 nm.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.