Magnetically coupled linear isolator

Hermann, T.; Black, W.C.; Hui, Shen

doi:10.1109/20.619652

Cited by 43 publications

(11 citation statements)

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“…where f − (E) = 1 + e β(E−µ) −1 denotes the Fermi function. Even the mixed correlation function ∆ σ , defined in (24), can rigorously be expressed by G kσ (E). Using the spectral theorem for higher Green functions, properly defined with respect to the two terms of ∆ σ in (24), and exploiting the equation of motion of G kσ (E), one gets:…”

Section: Interpolating Self-energy Ansatzmentioning

confidence: 99%

Self-energy approach to the correlated Kondo lattice model

et al. 2003

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We develop an interpolating self-energy approach to the correlated Kondo-lattice model. The correlation of the band electrons is taken into account by a Hubbard interaction. The method is based on a self-energy ansatz, the structure of which allows to fulfill a maximum number of exactly solvable limiting cases. The parameters of the ansatz are fitted to spectral moments via high-energy expansion of the self-energy. The band electron correlations are taken into account by an effective medium approach being correct in the strong coupling (U ) regime. The theory is considered reliable for all temperatures, band occupations, and exchange couplings. Results are presented for the respective dependencies of spectral densities, quasiparticle densities of states, and characteristic correlation functions, and interpreted in terms of elementary spin exchange processes between itinerant conduction electrons and localized magnetic moments. The appearance of magnetic polarons, the typical quasiparticle of Kondo-lattices, in the energy spectrum is worked out. Spin exchange processes prevent a total spin polarization of the band electrons even for arbitrarily strong exchange couplings as long as the local moments are represented by quantum mechanical spins.

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Section: Interpolating Self-energy Ansatzmentioning

confidence: 99%

Self-energy approach to the correlated Kondo lattice model

et al. 2003

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“…The bits are assembled and connected in an array as shown below creating "word lines" and "bit lines". The voltage across a single bit can be read by connecting to the array appropriately and the magnetization orientation of the bits changed by the magnetic field created from the passing of a write current [35]. or the aligned state.…”

Section: -Magnetic Random Access Memory (Mram)mentioning

confidence: 99%

GMR Materials: A New Generation of Miniaturizated Technology

Abu¹

2013

IOSR-JAP

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The discovery of GMR opened new windows in the field of nano-materials, and nowadays research in these materials has become fashionable due to its tremendous technological potential and the deep fundamental physics involved in it. The discovery of giant magneto-resistance (GMR) has been a huge impact on our life, especially for mass data storage devices. Initial experiments conducted by Grunberg and Fert are explained. Basic physics of the GMR effect can be explained by the two-current model, which the conduction of a current is, consist of two different spin electrons. Details of GMR applications, such as hard-disk read-heads, sensors and magnetic memory chips are presented. One of the important aspects of GMR discovery was that it was immediately turned into commercially available products (the first GMR Hard disk head was introduced by IBM in 1997) with a giant market share. The highest storage capacity in the modern computers is attributed to the discovery of GMR. The story of GMR effect tells us how an unexpected scientific discovery could give rise to completely new technologies, new science and new commercial products, that means the new technology promises smaller and faster tools.

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“…2, 3 Optical and capacitive isolators have been widely used in data communication, fieldbus isolation, peripheral interfaces, and telecommunications. 1 Electrical systems could be protected for unpredictable surge or noise by utilizing electrical isolation devices.…”

Section: Introductionmentioning

confidence: 99%

“…2, 3 Optical and capacitive isolators have been widely used in data communication, fieldbus isolation, peripheral interfaces, and telecommunications. 6,7 In this research, GMR isolator for high speed digital data transmission was modeled and output voltage, maximum operating frequency, and propagation delay of the isolator were estimated. 5 Recently, Fayfield and Wang fabricated giant magnetoresistance ͑GMR͒ isolators utilizing spin valves and spin dependent tunneling materials, which showed an operating frequency of 100 MHz.…”

Section: Introductionmentioning

confidence: 99%