Abstract
The reflection coefficient of bulk spin waves from multilayer ferromagnetic structure with periodically modulated parameters of exchange interaction, uniaxial and rhombic magnetic anisotropy and saturation magnetization is calculated with a non-ideal coupling between layers. The strong dependence of spin-wave reflection coefficient on frequency, magnetic field and parameter of interfacial coupling is revealed. It allows changing the reflection intensity from 0 to 1 by changing either only external magnetic field value or frequency. The proposed model of boundary conditions gives the opportunity to take into account the quality of interfaces when studying the reflection processes of spin waves in multilayer structures.PACS Codes: 75.30.Ds, 75.50.Dd, 75.70.Cn
Highlights
The physics of multilayer structures is a rapidly developing branch of science that promises ample opportunities for applications of such objects, in particular, in microelectronics
In published papers [57], the spectrum of bulk spin waves and reflection of bulk spin waves were investigated with the assumption of ideal exchange boundary conditions between layers of infinite multilayers with uniaxial magnetic structure
The easy axis is parallel to an external homogeneous permanent magnetic field, H0, itself parallel to z-axis
Summary
The physics of multilayer structures is a rapidly developing branch of science that promises ample opportunities for applications of such objects, in particular, in microelectronics. Thereupon, characterizing the propagation of spin waves in such structures has generated heightened interest [1,2,3], having led to a new research area of magnetism – magnonics [4]. In published papers [57], the spectrum of bulk spin waves and reflection of bulk spin waves were investigated with the assumption of ideal exchange boundary conditions between layers of infinite multilayers with uniaxial magnetic structure. The present paper is devoted to studying the reflective characteristics of a multilayer biaxial ferromagnetic media taking into account non-ideal magnetic properties of interfaces between layers, which lead to a "defective" coupling interaction at interfaces. In addition to modulation of the bulk exchange interaction and anisotropy, modulation of the saturation magnetization will be considered
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