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Self-consistent model of spin transfer switching of magnetic multilayers

Self-consistent model of spin transfer switching of magnetic...

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作者： Guo, Jie Jalil, Mansoor Bin Abdul Tan, Seng Ghee Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Computational Nanoelectronics and Nano-device Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Data Storage Institute A STAR (Agency for Science Technology and Research) DSI Building Singapore 117608 Singapore

The magnetization dynamics in a magnetic memory device has been analyzed self-consistently which takes into consideration the effects of the spin transfer torque. The coupled dynamics of the magnetic moment M and electron spins S are obtained by solving self-consistently the modified Landau-Lifshitz-Gilbert (LLG) equation governing M, and the dynamical equation of S, respectively. These equations incorporate the spin momentum transfer between M and S. The macrospin model is used, which assumes uniform magnetization in the free layer. We performed numerical simulations of the magnetization switching mechanism of M and the accompanying spin dynamics of S. The results indicate that besides the efficiency of the spin transfer torque, other factors such as the anisotropy field and the relaxation speed have a significant effect on the switching mechanism of the M. Our self-consistent model of the coupled magnetization and spin dynamics yields a more refined description of the current-induced switching process, which would be useful in achieving the optimal magnetization switching conditions in device applications. © 2006 IEEE.

关键词： Magnetic multilayers

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Comparing analytical, micromagnetic and statistical channel models at 4 Tcbpsi patterned media recording

Comparing analytical, micromagnetic and statistical channel ...

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作者： Chua, M. Elidrissi, M.R. Eason, K. Zhang, S.H. Qin, Z.L. Chai, K.S. Tan, K.P. Cai, K. Chan, K.S. Goh, W.L. Dong, Y. Victora, R.H. Data Storage Institute (DSI) Agency for Science Technology and Research (A STAR) 117608 Singapore Singapore School of Electrical and Electronic Engineering Nanyang Technological University 637457 Singapore Singapore Center for Micromagnetics and Information Technologies Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN United States

Bit patterned media recording (BPMR) is a candidate technology proposed to extend the areal density growth capability of magnetic recording systems. In conventional granular magnetic recording (CGMR), bits of information are recorded onto a number of randomly distributed magnetic grains. The difficulty for the granular media approach is that due to the randomness of the grains, a certain minimum number of grains are required in order to maintain the media signal to noise ratio (SNR). This requires smaller grains as the bits are shrunk and we end up with either unstable, or unwriteable grains as per the well-known media-trilemma. In BPMR, instead of random positions, the ''grains'' are ordered into a well-defined lattice of magnetic islands. Because of this ordering, the media SNR is no longer determined by the number of grains per bit as in CGMR, but is defined by the geometrical and magnetic distributions of the fabrication process of the media. Analytical models exist for BPMR, that flip grains in the media based on the switching field distribution (SFD) and the knowledge of the applied head field. On the other side, a statistical model for CGMR has been proposed that measures probabilities of grains flipping based on micromagnetic simulations, named the grain flipping probability (GFP) model. In this work, we adapt the GFP model for BPMR and perform a comparison between densities predicted via the analytical and GFP models, by processing the signals from these models with the appropriate detectors and LDPC (low density parity check) decoders. © 2012 IEEE.

关键词： Signal to noise ratio

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Advances in Robotics 1

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丛书名： Lecture Notes in computer science

1000年

作者： Jong-Hwan Kim Shuzhi Sam Ge Prahlad Vadakkepat Abdullah Al Manum Norbert Jesse Sadasivan Puthusserypady K Ulrich Rückert Joaquin Sitte Ulf Witkowski Ryohei Nakatsu Jacky Baltes John Anderson Igor Verner

ISBN: (数字)9783642039836

ISBN: (纸本)9783642039829

th This volume is an edition of the papers selected from the 12 FIRA RoboWorld C- gress, held in Incheon, Korea, August 16–18, 2009. The Federation of International Robosoccer Association (FIRA – www. fira. net) is a non-profit organization, which organizes robotic competitions and meetings around the globe annually. The RoboSoccer competitions started in 1996 and FIRA was - tablished on June 5, 1997. The Robot Soccer competitions are aimed at promoting the spirit of science and technology to the younger generation. The congress is a forum in which to share ideas and future directions of technologies, and to enlarge the human networks in robotics area. The objectives of the FIRA Cup and Congress are to explore the technical dev- opment and achievement in the field of robotics, and provide participants with a robot festival including technical presentations, robot soccer competitions and exhibits - der the theme “Where Theory and Practice Meet. ” th Under the umbrella of the 12 FIRA RoboWorld Congress Incheon 2009, six int- national conferences were held for greater impact and scientific exchange: th • 6 International Conference on Computational Intelligence, Robotics and Autonomous Systems (CIRAS) th • 5 International Symposium on Autonomous Minirobots for Research and Edutainment (AMiRE) • International Conference on Social Robotics (ICSR) • International Conference on Advanced Humanoid Robotics Research (ICAHRR) • International Conference on Entertainment Robotics (ICER) • International Robotics Education Forum (IREF) This volume consists of selected quality papers from the six conferences.

关键词： Artificial Intelligence User Interfaces and Human computer Interaction computers and Society computers and Education Personal Computing computer Appl. in Social and Behavioral sciences

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Advances in Security, Networks, and Internet of Things 1

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丛书名： Transactions on Computational science and Computational Intelligence

1000年

作者： Kevin Daimi Hamid R. Arabnia Leonidas Deligiannidis Min-Shiang Hwang Fernando G. Tinetti

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High Performance Computing 1

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丛书名： Lecture Notes in computer science

1000年

作者： Mateo Valero Kazuki Joe Masaru Kitsuregawa Hidehiko Tanaka

ISBN: (数字)9783540399995

ISBN: (纸本)9783540411284

I wish to welcome all of you to the International Symposium on High Perf- mance Computing 2000 (ISHPC 2000) in the megalopolis of Tokyo. After having two great successes with ISHPC’97 (Fukuoka, November 1997) and ISHPC’99 (Kyoto, May 1999), many people have requested that the symposium would be held in the capital of Japan and we have agreed. I am very pleased to serve as Conference Chair at a time when high p- formance computing (HPC) has a signi?cant in?uence on computer science and technology. In particular, HPC has had and will continue to have a signi?cant - pact on the advanced technologies of the “IT” revolution. The many conferences and symposiums that are held on the subject around the world are an indication of the importance of this area and the interest of the research community. One of the goals of this symposium is to provide a forum for the discussion of all aspects of HPC (from system architecture to real applications) in a more informal and personal fashion. Today we are delighted to have this symposium, which includes excellent invited talks, tutorials and workshops, as well as high quality technical papers.

关键词： Processor Architectures Software engineering/Programming and Operating Systems Programming Techniques Programming Languages, Compilers, Interpreters Algorithm Analysis and Problem Complexity Mathematics of Computing

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FePt patterned media fabricated by deep UV lithography followed by sputtering or PLD

FePt patterned media fabricated by deep UV lithography follo...

引用

作者： Qiu, L.J. Ding, J. Adeyeye, A.O. Yin, J.H. Chen, J.S. Goolaup, S. Singh, N. Department of Materials Science and Engineering National University of Singapore 119260 Singapore Singapore Department of Electrical and Computer Engineering National University of Singapore 119260 Singapore Singapore Data Storage Institute 117068 Singapore Singapore Institute of Microelectronics 117685 Singapore Singapore

Continuous and patterned FePt films (40 nm) were fabricated on silicon (100) substrates using deep ultraviolet lithography with the wavelength of 248 nm followed by sputter deposition or pulsed laser deposition at room temperature, liftoff, and postannealing in vacuum. The structures and magnetic properties of the films were characterized by X-ray diffractometry, X-ray photoelectron spectroscopy, scanning electron microscopy, and alternating gradient force magnetometry. A buffer layer of Ag or MgO was inserted between the Si substrate and FePt to prevent a chemical reaction between Si and FePt. The phase transformation from face-centered cubic to face-centered tetragonal started after annealing at 400°C for continuous films, while for the patterned FePt films, phase formation was retarded. High coercivities of 10-15 kOe have shown potential in hard magnetic applications. The effects of Ag and MgO top layers on the coercivities were also investigated. © 2007 IEEE.

关键词： Iron alloys

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Coupling asymmetry effect on the coherent spin current through a ferromagnetic lead/quantum dot/ferromagnetic lead system

Coupling asymmetry effect on the coherent spin current throu...

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作者： Ma, Minjie Jalil, Mansoor B. A. Tan, Seng Ghee Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Data Storage Institute Agency of Science Technology and Research (A and STAR) 117608 Singapore Singapore Computational Nanoelectronics and Nano-Device Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore

The spin dependent transport through asymmetric double barrier magnetic tunnel junction system is theoretically studied, based on the non-equilibrium Green's function obtained via the equation of motion method. In the system, a single energy level is considered in the semiconductor quantum dot, which is asymmetrically coupled to the left and the right leads. It is found that due to the asymmetric coupling, the threshold voltages for charge current I-V characteristics are different for positive and negative applied bias, so are the spin current I-V characteristics. Besides, it is also found that the direction of current flow also modifies the electron occupancy within the dot. © 2006 IEEE.

关键词： Semiconductor quantum dots

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Generalized spin electro-motive force in spatially dependent systems

Generalized spin electro-motive force in spatially dependent...

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作者： Jalil, M.B.A. Tan, S.G. Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Computational Nanoelectronics and Nano-Device Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Data Storage Institute A STAR (Agency for Science Technology and Research) 117608 Singapore Singapore

The coupling of an electron to an electromagnetic field is usually described by U(1) gauge fields in the Hamiltonian, whose gradient and curvature yield the electric and magnetic fields, respectively. We apply this gauge field formalism for two cases: i) electrons traveling through a medium with a spatial moment texture, and adiabatically relaxing along the local moment orientation, and ii) in the presence of Rashba spin-orbit interaction. Having obtained the Abelian U(1) and non-Abelian SU(2) gauge fields corresponding to the two cases, we apply the generalized Maxwell's relation to derive the resulting spin electromotive force (e.m.f.). Finally, we analyze the spin e.m.f. effect in an exemplary domain-wall system in a ferromagnetic nanostrip. © 2006 IEEE.

关键词： Hamiltonians

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Parallel processing and Applied Mathematics 1

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丛书名： Lecture Notes in computer science

1000年

作者： Roman Wyrzykowski Ewa Deelman Jack Dongarra Konrad Karczewski Jacek Kitowski Kazimierz Wiatr

ISBN: (数字)9783319321523

ISBN: (纸本)9783319321516

This two-volume-set (LNCS 9573 and 9574) constitutes the refereed proceedings of the 11th International Conference of Parallel processing and Applied Mathematics, PPAM 2015, held in Krakow, Poland, in September 2015. The 111 revised full papers presented in both volumes were carefully reviewed and selected from 196 submissions. The focus of PPAM 2015 was on models, algorithms, and software tools;which facilitate efficient and convenient utilization of modern parallel and distributed computing architectures, as well as on large-scale applications, including big data problems.

关键词： Software engineering Algorithm Analysis and Problem Complexity Information Systems Applications (incl. Internet) Programming Techniques computer Communication Networks Mathematics of Computing

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Parallel processing and Applied Mathematics 1

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丛书名： Lecture Notes in computer science

1000年

作者： Roman Wyrzykowski Ewa Deelman Jack Dongarra Konrad Karczewski Jacek Kitowski Kazimierz Wiatr

ISBN: (数字)9783319321493

ISBN: (纸本)9783319321486

This two-volume set LNCS 9573 and LNCS 9574 constitutes the refereed proceedings of the 11th International Conference of Parallel processing and Applied Mathematics, PPAM 2015, held in Krakow, Poland, in September 2015.;The 111 revised full papers presented in both volumes were carefully reviewed and selected from 196 submissions. The focus of PPAM 2015 was on models, algorithms, and software tools which facilitate efficient and convenient utilization of modern parallel and distributed computing architectures, as well as on large-scale applications, including big data problems.

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