نتایج جستجو برای: magnetoelectronics
تعداد نتایج: 43 فیلتر نتایج به سال:
Within the framework of the Landau-Lifshitz-Gilbert equation, using permalloy parameters, we study the statics and dynamics of flat circular magnetic nano-structures with an in-plane magnetic vortex configuration, putting particular emphasis on the vorticity of the magnetic state and on the (perpendicular) polarisation of the vortex center, which may be shifted with respect to the center of the...
Half-metallic ferromagnets represent a new class of materials which attracted a lot of attention due to their possible applications in spintronics (also known as magnetoelectronics) [1]. Adding the spin degree of freedom to the conventional electronic devices has several advantages like non-volatility, increased data processing speed, decreased electric power consumption and increased integrati...
در این رساله با استفاده از نرم¬افزار espresso در ابتدا خواص انبوهه¬ی بلور crse در هر دو ساختار nias و بلندروی به تفصیل مورد مطالعه قرار گرفته است. در ادامه خواص الکترونی، مغناطیسی و ناپیوستگی نواری مرز مشترک crse/znse را با ساخت ابریاخته¬های با ضخامت¬های مختلف (16، 20 و 24 لایه¬ای) استخراج کردیم. محاسبات نشان دادند که خاصیت نیم¬فلزی در مرزمشترک cr/se حفظ شده و اندازه¬ی گاف نیم¬فلزی برابر 1.9 ال...
Finite size nanoscopic systems are very interesting for being halfway between atoms and bulk systems. In this category molecular magnets play very important role in fundamental physics since these systems have shown new magnetic and electronic futures and revealed to be promising for possible applications in quantum computing and magnetoelectronics. Among these systems, there are homonuclear an...
We present an innovative approach to the production of single-crystal iron oxide nanorings employing a solution-based route. Single-crystal hematite (alpha-Fe2O3) nanorings were synthesized using a double anion-assisted hydrothermal method (involving phosphate and sulfate ions), which can be divided into two stages: (1) formation of capsule-shaped alpha-Fe2O3 nanoparticles and (2) preferential ...
– We consider the tunnel current between two ferromagnetic metals from a perspective similar to the one used in superconductor/superconductor tunnel junctions. We use fundamental arguments to derive a Josephson-like tunnel spin current I J ∝ sin(θ1 − θ2). Here the phases are associated with the planar contribution to the magnetization, 〈c†↑c↓〉 ∼ e . The crucial step in our analysis is the fact ...
During the last years spin-polarized transport became a matter of major interest [1, 2], giving rise to a eld usually called magnetoelectronics, or spintronics. Much e ort has been made in studying and producing the so-called spin-valve, where a spin-polarized current is generated. A promising system in that area is the recently grown structure of GaAs/AlAs with inclusions of Ga1 xMnxAs layers ...
The fabrication and structural characterization of a surface micromachined, resonant frequency, Pb(Zr, Ti)O3 (PZT) microcantilever will be presented. The PZT microcantilever was fabricated using surface micromachining techniques, and used a low-stress silicon nitride thin film as the base material for the microcantilever onto which a PZT thin film was incorporated. The PZT thin film is used as ...
We developed a self-consistent screened-Korringa± Kohn± Rostoker (KKR) method in an ab initio tight-binding formulation. The reduction in numerical e ort in comparison with that required for the standard KKR method is achieved by the choice of a suitable reference system. Following the idea of Zeller et al. (1995, Phys. Rev. B, 52, 8807), reference systems with repulsive mu n-tin potentials o...
– The interplay between clustering and exchange coupling in magnetic semiconductors for the prototype (Ga1−x,Mnx)As with manganese concentrations x of 1/16 and 1/32 in the interesting experimental range is investigated. For x ∼ 6%, when all possible arrangements of two atoms within a large supercell are considered, the clustering of Mn atoms at nearest-neighbour Ga sites is energetically prefer...
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