Time-dependent spin transport in a hybrid graphene/single magnetic molecule structure

Javadpour, Ayat; Pilehrood, Saeid Hessami

doi:10.1016/j.physe.2023.115684

Cited by 2 publications

(5 citation statements)

References 32 publications

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“…This is an important and practical feature of controlling spintronic systems. One can compare the results obtained here with what was observed earlier in the study of the same system but in weak magnetic fields [40]. While at high magnetic fields significant responses in charge and spin currents are observed almost instantaneously, at low magnetic fields such responses occur at longer time intervals.…”

Section: Discussionsupporting

confidence: 85%

“…The behavior of time-dependent currents in the system has been examined by applying a magnetic field and a bias voltage with a symmetric stepped waveform expressed as V t t , 0 [40]. Before using the bias voltage, the local spin is subjected to an external stationary magnetic field B Bz, = and we have S S sin , Figure 2(a) shows the charge current against the stepped bias voltage at different times for ferromagnetic leads, where the bias voltage is applied at t 0.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…In the presence of a magnetic field, the interaction Hamiltonian between a quantum dot and graphene H GQ is defined as follows [24,37]: and v¢ is the interaction rate between the local spin and graphene electron spin [40,41]. This study investigates the tunneling current and performs timedependent analysis by applying a large magnetic field and using non-equilibrium Green's function.…”

Section: Model and Formalismmentioning

confidence: 99%

“…is the Green's function for leads, including the time-dependent bias voltage, and g t t , k ( ) ¢ s is the Green's function representing the interactions between graphene and quantum dot [40].…”

Section: Model and Formalismmentioning

confidence: 99%

“…is the parameter of interaction between the graphene and the quantum dot, where 0 g is the coupling parameter rate between graphene and quantum dot, and p 1,1 [40].…”

Section: Model and Formalismmentioning

confidence: 99%

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Time-dependent magnetotransport in a hybrid graphene/single magnetic molecule structure

Javadpour,

Hessami Pilehrood

2023

Phys. Scr.

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Graphene is potentially attractive for spintronics due to its weak intrinsic spin–orbit effect leading to a long spin relaxation length. This study examines molecular couplings on a planar graphene sheet, where one molecule is attached to the graphene sheet connected to ferromagnetic leads. The effects of a strong magnetic field, gate voltage, and time-dependent bias voltage on spin and charge tunneling currents are investigated. It is indicated that the studied model system could be controlled by applying a gate voltage and a time-dependent bias voltage. Regarding the interaction between graphene, magnetic molecule, and magnetic field, it is observed that the mutual interaction coefficients between them have the most considerable effect on the transport current. Applying the magnetic field shows that the response time of the current is very short, and the current is not zero in the steady state. In this situation, the current passes through the system continuously.

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Section: Discussionsupporting

confidence: 85%

Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Model and Formalismmentioning

confidence: 99%

Section: Model and Formalismmentioning

confidence: 99%

“…is the parameter of interaction between the graphene and the quantum dot, where 0 g is the coupling parameter rate between graphene and quantum dot, and p 1,1 [40].…”

Section: Model and Formalismmentioning

confidence: 99%

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Time-dependent magnetotransport in a hybrid graphene/single magnetic molecule structure

Javadpour,

Hessami Pilehrood

2023

Phys. Scr.

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Time-dependent spin and charge transport in a strain-engineered graphene sheet coupled to a single-molecular magnet

Javadpour,

Pilehrood,

Abdollahipour

2024

Phys. Scr.

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Recent confirmation shows that graphene is the toughest substance on record and can withstand elastic and reversible deformations exceeding 20%. In this article, we focus on the effect of homogeneous axial tension on graphene-based junctions, where a molecular magnet is coupled to a graphene sheet connected to ferromagnetic leads. We demonstrate that a homogeneous longitudinal strain enhances the oscillatory variations in the spin and charge currents at the time, gate, and bias voltages. In particular, we demonstrate that applying strain makes it possible to control the switching time between the minimum and maximum spin and charge currents. These results can be employed in spintronic devices based on graphene to enhance the control of the device features.

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Time-dependent spin transport in a hybrid graphene/single magnetic molecule structure

Cited by 2 publications

References 32 publications

Time-dependent magnetotransport in a hybrid graphene/single magnetic molecule structure

Time-dependent magnetotransport in a hybrid graphene/single magnetic molecule structure

Time-dependent spin and charge transport in a strain-engineered graphene sheet coupled to a single-molecular magnet

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