Adel H. Phillips

Ain Shams University

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Photo-Induced Thermo-Spin In Ferromagnetic Graphene Field Effect Transistor

Mina D. Asham Walid A. Zein Adel H. Phillips

Thermospin effects in ferromagnetic graphene mesoscopic device are investigated. The thermo-spin characteristics such as spin Seebeck coefficient, the thermal conductance, and spin figure of merit are expressed in terms of the tunneling probability of Dirac fermions for both parallel and antiparallel spin alignments of electrons. This tunneling probability and the corresponding electrical conductance are derived by solving Dirac equation for both spin alignments. Numerical calculations are performed and the obtained results show that the values of Seebeck coefficient, thermal conductance, and figure of merit are different for spin up and spin down. Their values are increased as the frequency of the induced ac-field increases, that is, the thermospin transport through such device is enhanced by the photon energy. The present research is very important in the field of spin caloritronics on the nanoscale systems.

Mesoscopic physics

Figure of Merit

Spin valve

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Spin Dependent Peltier Effect in Ferromagnetic Graphene / Superconducting Graphene Junction

Ahmed S. Abdelrazek M. El-Banna Adel H. Phillips

A spin dependent Peltier effect in graphene nanodevice is investigated. This nanodevice is modeled as ferromagnetic graphene/ superconducting graphene junction with Schottky barrier of delta-type at the interface of the junction. The Peltier coefficient is expressed in terms of spin-dependent Andreev reflection and normal reflection which will be deduced by solving Dirac-Bogoliubov-deGennes equation in one dimension. Numerical calculations are performed for two different superconducting layers under the effects of the induced ac-field and magnetic field. Results show that the present nanodevice operates only in narrow band of THz frequencies. Also, the present results might indicate that the present nanodevice is stable under the effect of magnetic field, which must be needed for quantum information processing. The present graphene nanodevice based on Peltier effect might be used as coolers for nanoelectronic devices such as nanocontrollers and computer CPUs. The present research is very important in the field of spin caloritronics on the nanoscale systems and at low temperatures.

Nanodevice

Andreev reflection

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Fano Factor in Strained Graphene Nanoribbon Nanodevices

Chinese Physics Letters (2017)

Walid Tawfik Mina D. Asham Adel H. Phillips

Fano plane

10.1088/0256-307x/34/11/118503

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Coherent Manipulation of Spin Thermoelectric Dynamics in Graphene Nanodevice

American Journal of Modern Physics (2015)

Ahmed S. Abdelrazek M. El-Banna Adel H. Phillips

A spin-thermoelectric effect in graphene nanodevice is investigated. This nanodevice is modeled as ferromagnetic graphene/ superconducting graphene junction with Schottky barrier of delta-type at the interface of the junction. The thermoelectric parameters are expressed in terms of spin-dependent Andreev reflection and normal reflection which will be deduced by solving Dirac-Bogoliubov-deGennes equation in one dimension. Numerical calculations are performed for two different superconducting layers under the effects of both frequency of the induced ac-field and under the effect of magnetic field. Results show that the present nanodevice operates only in narrow band of THz frequencies. Also, the present results might indicate that the present nanodevice is stable under the effect of magnetic field, which must be needed for quantum information processing. The present research is very important in the field of spin caloritronics on the nanoscale systems and at low temperatures.

Nanodevice

Andreev reflection

Reflection

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The temperature dependence of the yield point of nickel in the presence of static and alternating magnetic fields

Materials Science and Engineering (1984)

Adel H. Phillips

10.1016/0025-5416(84)90113-7

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Ferromagnetic Silicene Superlattice Based Thermoelectric Flexible Renewable Energy Generator Device

IEEE Access (2021)

M. El-Banna Adel H. Phillips Ahmed Saeed Abdelrazek Bayoumi

The object of the current research manuscript is to analyze the valley-spin thermoelectric properties and Nernst coefficient at two different temperatures for ferromagnetic silicene superlattice.Photon-assisted tunneling probability is used to identify the resolved thermoelectric parameters including (valley, spin, and charge) electronic thermal conductance, Seebeck coefficient, figure of merit, and also electrical conductance and Nernst coefficient.The results show oscillatory behavior to all investigated parameters.The improved data of Seebeck coefficient (valley, spin, and charge) could be because of quantum confinement effect of the present investigated nanodevice.The figure of merit (valley, spin, and charge) attains quite high values with good high thermoelectric efficiency.The enhancement of Nernst coefficient (valley, spin, and charge) might consider Nernst effect is suitable for thermoelectric heat energy conversion system of the present flexible ferromagnetic silicene superlattice.The ferromagnetic silicene superlattice nanodevices are good candidates for flexible renewable energy generation as demonstrated by this analysis.

Figure of Merit

Nernst effect

10.1109/access.2021.3098042

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SPIN-COHERENT TRANSPORT IN MESOSCOPIC INTERFERENCE DEVICE

NANO (2007)

Walid A. Zein Adel H. Phillips Omar A. Omar

We investigate the quantum size effect in the phase coherent mesoscopic ring. A quantum dot is embedded in one arm and it is connected to one lead via tunnel barrier. Both Aharonov–Casher and Aharonov–Bohm effects are studied. A spin-dependent conductance has been deduced and it depends on the intrinsic parameters. Our results show that the strength of spin-orbit coupling depends on the size of the present device. This investigation is valuable for fabricating such spintronics devices.

Mesoscopic physics

Aharonov–Bohm effect

10.1142/s1793292007000726

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Structure analysis of the metallic glass Fe40Ni40B20 using the tangent lattice model

physica status solidi (a) (1985)

Adel H. Phillips N. K. Gobran R. Kamel

The electrical resistivity is adopted as a structure sensitive property to trace atomic rearrangments before and after crystallization of the metallic glasses. Hence, using Ziman-Evan's theory the electrical resistivity for the amorphous phase of metglass is calculated, taking into consideration the radial distribution function for the tangent lattice model. From the calculations a model based on atomic tilting can be adopted and 8 tangent lattice form can be applied to the amorphous state of metglasses such as Fe40Ni40B20. Der elektrische Widerstand wird als strukturempfindliche Eigenschaft benutzt, um atomare Umordnungen vor und nach der Kristallsation von metallischen Gläsern zu verfolgen. Deshalb wird mti der Theorie von Ziman-Evans der elektrische Widerstand für die amorphe Phase von Metglas berechnet, wobei die radiale Verteilungsfunktion für das Tangentengittermodell berücksichtigt wird. Aus den Berechnungen kann ein Modell auf der Grundlage der atomaren Kippung entnommen werden. und es läßt sich eine Tangentengitterform auf den amorphen Zustand von Metgläsern wie Fe40Ni40B20 anwenden.

Metglas

Lattice (music)

10.1002/pssa.2210880208

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Transport Properties of Thermal Shot Noise Through Superconductor-Ferromagnetic /2DEG Junction

Attia A. Awad Alla Adel H. Phillips

We study transport properties of thermal shot noise, thermo power and thermal conductance through superconductor-ferromagnetic /2DEG junction under the effect of Fermi energy, number of open channels and excitation energy. Thermal shot noise, PT hermal is directly related to the conductance through the fluctuation- dissipation theorem; the model consists of a 2DEG region inserted between two identical superconductor electrodes. Ferromagnetic strips are placed onto top of each superconductor/2DEG junction and voltage applied across the model. The results show an oscillatory behavior of the dependence of the thermal shot noise on Fermi energy. These results agree with existing experiments. This research is very important for using a model as a high-frequency shot noise detector. c

Fermi energy

Noise power

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A simple model for illustrating the symmetry of crystals

American Journal of Science (1913)

Adel H. Phillips

10.2475/ajs.s4-36.211.30

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