Improvement of tunneling magnetoresistance and spin-valley polarization in magnetic silicene superlattices induced by structural disorder

Oubram, O.; Rojas-Briseño, J. G.; Molina-Valdovinos, S.; Rodrı́guez-Vargas, I.

doi:10.1103/physrevb.105.115408

Cited by 11 publications

(14 citation statements)

References 44 publications

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“…Furthermore, it is of great interest to generalize the link between structural periodicity and dynamical properties to high-dimensional systems, non-Hermitian system, and many-body system. ,− It provides a promising approach to exploring the role of disorder in physical phenomena, such as topological phase transition, metal–insulator transition, and glass transition. ,− …”

Section: Discussionmentioning

confidence: 99%

Probing Structural Correlated Disorder with Photonic Transport

Yang,

Chang,

et al. 2024

ACS Photonics

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Wave spreading has been widely studied in various disordered materials including quasiperiodic, amorphous, and completely random materials based on the spatial order. However, there is no clear observable mechanism connecting the underlying correlated disorder to wave transport. Here, we experimentally probe correlated disorder with different characteristic length scales in disordered materials by directly observing the photonic transport on a chip. The density of states of corresponding aperiodic structures shows different degrees of singularity, suggesting diverse behaviors of photons. By analyzing localization and transport properties of photons, we demonstrate that compared to the nearly ballistic transport in the quasiperiodic lattice with long-range order, photon behavior is partly destroyed from ballistic transport in amorphous lattices with short-range order while totally deviating from ballistic spreading in completely random lattices without spatial order. The spreading coefficient related to the photon variance represents an evident difference for correlated disorder with different characteristic length scales. The resolution of diverse transport behaviors is sufficient to distinguish different disorder types, suggesting an eligible identifier for disorder materials.

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Section: Discussionmentioning

confidence: 99%

Probing Structural Correlated Disorder with Photonic Transport

Yang,

Chang,

et al. 2024

ACS Photonics

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“…So, we can think in magnetic superlattices as a real possibility in the near future. From the theoretical side, there are several reports that indicate that a periodic magnetic modulation can be used to improve the magnetoresistive response of 2D materials [10][11][12][13][14]. For instance, the giant magnetoresistance effect was studied in magnetic graphene superlattices [11].…”

Section: Introductionmentioning

confidence: 99%

Tuning the magnetoresistance properties of phosphorene with periodic magnetic modulation

Oubram

Sadoqi

Cisneros-Villalobos

et al. 2023

J. Phys.: Condens. Matter

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Periodic superlattices constitute ideal structures to modulate the transport properties of two-dimensional materials. In this paper, we show that the tunneling magnetoresistance in phosphorene can be tuned effectively through periodic magnetic modulation. Deltaic magnetic barriers are arranged periodically along the phosphorene armchair direction in parallel and anti-parallel magnetization fashion. The theoretical treatment is based on a low-energy effective Hamiltonian, the transfer matrix method and the Landauer-B¨uttiker formalism. We find that the periodic modulation gives rise to oscillating transport characteristics for both parallel and anti-parallel magnetization configurations. More importantly, by adjusting the electrostatic potential appropriately we find Fermi energy regions for which the anti-parallel magnetization conductance is reduced significantly while the parallel magnetization conductance keeps considerable values, resulting in an effective tunneling magnetoresistance that increases with the magnetic field strength. These findings could be useful in the design of magnetoresistive devices based on magnetic phosphorene superlattices.

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“…The spin inversion symmetry between the valleys K and K ′ induces spinvalley currents [25]. Several strategies have been implemented to manipulate the spin and valley polarized currents [26][27][28][29][30][31][32][33][34][35][36], including periodic or superlattice potentials [30][31][32][33][34][35][36]. Of particular interest are magnetic silicene superlattices (MSSLs) due to its possibilities as versatile structures with spin-valley polarization and tunneling magnetoresistance capabilities [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…Several strategies have been implemented to manipulate the spin and valley polarized currents [26][27][28][29][30][31][32][33][34][35][36], including periodic or superlattice potentials [30][31][32][33][34][35][36]. Of particular interest are magnetic silicene superlattices (MSSLs) due to its possibilities as versatile structures with spin-valley polarization and tunneling magnetoresistance capabilities [34][35][36]. In fact, zigzag silicene nanoribbons modulated by magnetic superlattices result in valley-resolved minigaps and minibands which give rise to periodic spin-valley polarization and TMR [34].…”

Section: Introductionmentioning

confidence: 99%

“…However, the spin-valley polarization of the AM configuration presents multiple oscillations that impede stable negative polarization states. MSSLs with structural disorder in the widths and heights of the barriers-wells improve the spin-valley polarization and the TMR by eliminating the conductance oscillations caused by the periodic mag-netic modulation [36]. Unfortunately, the control of the structural disorder could be tricky, and other possibilities to eliminate the conductance oscillations in MSSLs are welcomed.…”

Section: Introductionmentioning

confidence: 99%

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

Villasana-Mercado¹,

Rojas-Briseño²,

Molina-Valdovinos³

et al. 2022

Preprint

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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-Büttiker 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.

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Improvement of tunneling magnetoresistance and spin-valley polarization in magnetic silicene superlattices induced by structural disorder

Cited by 11 publications

References 44 publications

Probing Structural Correlated Disorder with Photonic Transport

Probing Structural Correlated Disorder with Photonic Transport

Tuning the magnetoresistance properties of phosphorene with periodic magnetic modulation

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

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