Spintronics device based on metamaterial

Abstract

The invention belongs to the technical field of spintronics, and particularly relates to a spintronics device based on a metamaterial. The spintronics device disclosed by the invention is a composite metamaterial system formed by combining a magnetic metal material and a non-magnetic metal material; the upper layer of the spintronics device is of a metal structure consisting of two similar split-ring resonator structures back to back, metal structural units are periodically attached onto an insulating substrate, and the dimensions of the upper layer are in the sub-wavelength magnitude; and the lower layer of the spintronics device consists of periodical metal strips and strips with gradually changing widths, and a magnetic film is arranged at the narrowest place of each metal strip. The structural resonance of the non-magnetic metal material can concentrate electromagnetic waves inside the structure at maximum efficiency, namely a perfect absorption mode is realized; and moreover, the electromagnetic waves are absorbed by using a spinning rectification effect generated by electron spin motion and nonlinear coupling of charge current in a ferromagnetic material, so that a direct current voltage signal is generated. Therefore, the magnetic metal material is placed at the position with strongest electromagnetic field and current in the system, the electromagnetic waves generated by structural resonance are absorbed, and available direct current voltage is generated.

Description

technical field [0001] The invention belongs to the technical field of spin electronics, and in particular relates to a spin electronics device based on metamaterials. Background technique [0002] Metamaterials [1] are electromagnetic metamaterials with artificially designed resonant structures as the basic unit (meta-atom) arranged in a lattice-like manner to form extraordinary physical properties that natural materials do not have, such as perfect absorption [2], negative Refraction, stealth, artificial magnetic response [3], electromagnetically induced transparency (EIT), ENZ (epsilon-near-zero) materials, etc. Metamaterials have a strong ability to control electromagnetic fields, but for absorbed or amplified electromagnetic fields, they are basically dissipated in the form of heat. Although perfect absorption is achieved, the energy of the collected electromagnetic waves is not effectively used. . [0003] We know that electrons have another degree of freedom besides...

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Problems solved by technology

However, the current spin rectification devices are mainly concentrated in the low-frequency or near-DC range, and the research above high-frequency (GHz) is obviously lagging behind, and the high-frequency range is generally only through the wired transmission method of the coplanar waveguide [6]. However, the coplanar The waveguide's inherent electromagnetic field distribution mode and the need to match impedance have brought great obstacles to the high frequency, integration and wireless of spintronics devices.

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