Spin waves transport across a ferrimagnetically ordered nanojunction of cobalt-gadolinium alloy between cobalt leads

A model calculation is presented for the spin wave scattering and coherent transport at the ferrimagnetically ordered cobalt-gadolinium alloy nanojunction between cobalt leads. The structural model for the amorphous alloy nanojunction [Co 1/2 Gd 1/2 ] 3 is considered as an ordered alloy hcp structur...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2013-04, Vol.86 (4), Article 180
Main Authors: Ghader, Doried, Ashokan, Vinod, Ghantous, Michel Abou, Khater, Antoine
Format: Article
Language:English
Subjects:
Analysis
Cobalt
Complex Systems
Condensed Matter Physics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Fluid- and Aerodynamics
Gadolinium
Magnetic properties and materials
Magnetic properties of nanostructures
Metallic glasses
Physics
Physics and Astronomy
Regular Article
Solid State Physics
Specialty metals industry
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Summary:A model calculation is presented for the spin wave scattering and coherent transport at the ferrimagnetically ordered cobalt-gadolinium alloy nanojunction between cobalt leads. The structural model for the amorphous alloy nanojunction [Co 1/2 Gd 1/2 ] 3 is considered as an ordered alloy hcp structure of three (0001) atomic planes between the leads. To analyze the spin dynamics and spin wave scattering at the nanojunction boundary, the phase field matching method (PFMT) is implemented over the ground state of the system, in the Heisenberg Hamiltonian representation. The coherent reflection and transmission probabilities of spin waves from the cobalt leads incident onto the nanojunction boundary are calculated, and numerical results are presented for the coherent SW transport across the nanojunction over the entire range of their frequencies. The results are especially valid in the interval between nanometric SW wavelengths greater than the nanojunction width and macroscopic wavelengths. They demonstrate in particular, the possibility of the resonance assisted maxima for the SW transmission spectra owing to the interactions between the incident spin waves and the localized spin resonances on the nanojunction. This effect is general and may be observed at different characteristic frequencies and corresponding incident angles.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2013-30994-5