Tunneling magnetoresistance and spin-valley polarization of aperiodic magnetic silicene superlattices

Magnetic silicene superlattices (MSSLs) are versatile structures with spin-valley polarization and tunneling magnetoresistance (TMR) capabilities. However, the oscillating transport properties related to the superlattice periodicity impede stable spin-valley polarization states reachable by reversin...

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Bibliographic Details
Published in:arXiv.org 2022-09
Main Authors: Villasana-Mercado, P, Rojas-Briseño, J G, Molina-Valdovinos, S, Rodríguez-Vargas, I
Format: Article
Language:English
Subjects:
Magnetic properties
Magnetoresistance
Magnetoresistivity
Matrix methods
Oscillations
Polarization (spin alignment)
Silicene
Superlattices
Transfer matrices
Transport properties
Valleys
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Summary:Magnetic silicene superlattices (MSSLs) are versatile structures with spin-valley polarization and tunneling magnetoresistance (TMR) capabilities. However, the oscillating transport properties related to the superlattice periodicity impede stable spin-valley polarization states reachable by reversing the magnetization direction. Here, we show that aperiodicity can be used to improve the spin-valley polarization and TMR by reducing the characteristic conductance oscillations of periodic MSSLs (P-MSSLs). Using the Landauer-B\"uttiker formalism and the transfer matrix method, we investigate the spin-valley polarization and the TMR of Fibonacci (F-) and Thue-Morse (TM-) MSSLs as typical aperiodic superlattices. Our findings indicate that aperiodic superlattices with higher disorder provide better spin-valley polarization and TMR values. In particular, TM-MSSLs reduce considerably the conductance oscillations giving rise to two well-defined spin-valley polarization states and a better TMR than F- and P-MSSLs. F-MSSLs also improve the spin-valley polarization and TMR, however they depend strongly on the parity of the superlattice generation.
ISSN:2331-8422
DOI:10.48550/arxiv.2209.13783