Espalhamento estacionário de mágnons 1D por um defeito de ligação anisotrópico e antissimétrico

Abstract

Understanding the phenomena of magnetization wave transport in media with impurities is fundamental for the development of spintronics, a technology analogous to electronics, which exploits the degree of freedom of electron spin. We studied the scattering of one-dimensional iron and antiferromagnetic magnons by a bonding defect. We consider a defect with J1 exchange coupling, ∆ transverse anisotropy, and Dzyaloshinskii–Moriya D interaction. The bonding defect connects two chains of lateral spins with first neighbors with Heisenberg isotropic exchange coupling J. The bonding defect is responsible for an anisotropic Heisenberg coupling and an antisymmetric Dzyaloshinskii-Moriya-type interaction. Within a semiclassical approach, the theory of stationary scattering is used to calculate the transmission spectra of magnon excitations as a function of the coupling parameters in the bonding defect. We compared the spectral properties of iron and antiferromagnetic magnons. A transparent transmission flat band occurs for a particular superposition of values of the anisotropic and antisymmetric defect couplings. In addition, we reveal a transparent mode of ferromagnetic magnons in a region of the defect coupling parameter space that is absent in the case of antiferromagnetic magnons.