The Experts below are selected from a list of 87204 Experts worldwide ranked by ideXlab platform
Rie Sato - One of the best experts on this subject based on the ideXlab platform.
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Simulations and Experiments Toward High-Data-Transfer-Rate Readers Composed of a Spin-Torque Oscillator
IEEE Transactions on Magnetics, 2012Co-Authors: Rie Sato, T Nagasawa, Kiwamu Kudo, Hirofumi Suto, K MizushimaAbstract:High-Data-Transfer-Rate readers beyond 3 Gbit/s composed of spin-torque oscillators (STOs) are considered and the signal-to-noise ratios (SNRs) of the output signals under the thermal magnetization fluctuations are calculated by using the recent nonlinear theories. The “STO Reader” senses the media field as a modulation in the oscillation frequency, enabling high-Data-Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by frequency modulation (FM) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in nonlinear STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are expected even in nonlinear STOs less than 30×30 nm2 in size. The prompt response of the STO frequency (phase) to the media field and the high-Data-Transfer Rate beyond 5 Gbit/s are shown by micromagnetic simulation. The frequency transition of STO in less than 1 ns under the pulse field is also confirmed by experiment.
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High-Data-Transfer-Rate read heads composed of spin-torque oscillators
Journal of Physics: Conference Series, 2011Co-Authors: K Mizushima, Kiwamu Kudo, T Nagasawa, Rie SatoAbstract:The signal-to-noise ratios (SNRs) of the high-Data-Transfer-Rate read heads beyond 3 Gbits/s composed of spin-torque oscillators (STOs) are calculated under the thermal magnetization fluctuations by using the recent nonlinear theories. The STO head senses the media field as a modulation in the oscillation frequency, enabling high signal Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by FM (frequency modulation) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are obtained even in nonlinear STOs less than 30 ? 30 nm2 in size.
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Numerical Simulation on Temporal Response of Spin-Torque Oscillator to Magnetic Pulses
Applied Physics Express, 2010Co-Authors: Kiwamu Kudo, K Mizushima, T Nagasawa, Hirofumi Suto, Rie SatoAbstract:For the application of the spin-torque oscillator to a high-Data-Transfer-Rate read head, it is indispensable that the oscillation frequency responds promptly to the magnetic field from recorded bits. In this paper, we numerically exemplify the phase response to a short magnetic pulse. The phase basically follows the magnetic pulse although it takes several nanoseconds to return to the steady state because of the frequency nonlinearity. We also demonstRate the differential detection of recorded bits at the Data-Transfer Rate beyond 5 Gbit/s.
Roger Zimmermann - One of the best experts on this subject based on the ideXlab platform.
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Zoned-RAID
ACM Transactions on Storage, 2007Co-Authors: Seon Ho Kim, Hong Zhu, Roger ZimmermannAbstract:The RAID (Redundant Array of Inexpensive Disks) system has been widely used in practical storage applications for better performance, cost effectiveness, and reliability. This study proposes a novel variant of RAID named Zoned-RAID (Z-RAID). Z-RAID improves the performance of traditional RAID by utilizing the zoning property of modern disks which provides multiple zones with different Data Transfer Rates within a disk. Z-RAID levels 1, 5, and 6 are introduced to enhance the effective Data Transfer Rate of RAID levels 1, 5, and 6, respectively, by constraining the placement of Data blocks in multizone disks. We apply the Z-RAID to a practical and popular application, streaming media server, that requires a high-Data Transfer Rate as well as a high reliability. The analytical and experimental results demonstRate the superiority of Z-RAID to conventional RAID. Z-RAID provides a higher effective Data Transfer Rate in normal mode with no disadvantage. In the presence of a disk failure, Z-RAID still performs as well as RAID.
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DASFAA - Zoned-RAID for multimedia Database servers
Database Systems for Advanced Applications, 2005Co-Authors: Ali E. Dashti, Seon Ho Kim, Roger ZimmermannAbstract:This paper proposes a novel fault-tolerant disk subsystem named Zoned-RAID (Z-RAID). Z-RAID improves the performance of traditional RAID system by utilizing the zoning property of modern disks which provides multiple zones with different Data Transfer Rates in a disk. This study proposes to optimize Data Transfer Rate of RAID system by constraining placement of Data blocks in multi-zone disks. We apply Z-RAID for multimedia Database servers such as video servers that require a high Data Transfer Rate as well as fault tolerance. Our analytical and experimental results demonstRate the superiority of Z-RAID to conventional RAID. Z-RAID provides a higher effective Data Transfer Rate in normal mode with no disadvantage. In the presence of a disk failure, Z-RAID still performs as well as RAID.
Kiwamu Kudo - One of the best experts on this subject based on the ideXlab platform.
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Simulations and Experiments Toward High-Data-Transfer-Rate Readers Composed of a Spin-Torque Oscillator
IEEE Transactions on Magnetics, 2012Co-Authors: Rie Sato, T Nagasawa, Kiwamu Kudo, Hirofumi Suto, K MizushimaAbstract:High-Data-Transfer-Rate readers beyond 3 Gbit/s composed of spin-torque oscillators (STOs) are considered and the signal-to-noise ratios (SNRs) of the output signals under the thermal magnetization fluctuations are calculated by using the recent nonlinear theories. The “STO Reader” senses the media field as a modulation in the oscillation frequency, enabling high-Data-Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by frequency modulation (FM) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in nonlinear STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are expected even in nonlinear STOs less than 30×30 nm2 in size. The prompt response of the STO frequency (phase) to the media field and the high-Data-Transfer Rate beyond 5 Gbit/s are shown by micromagnetic simulation. The frequency transition of STO in less than 1 ns under the pulse field is also confirmed by experiment.
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High-Data-Transfer-Rate read heads composed of spin-torque oscillators
Journal of Physics: Conference Series, 2011Co-Authors: K Mizushima, Kiwamu Kudo, T Nagasawa, Rie SatoAbstract:The signal-to-noise ratios (SNRs) of the high-Data-Transfer-Rate read heads beyond 3 Gbits/s composed of spin-torque oscillators (STOs) are calculated under the thermal magnetization fluctuations by using the recent nonlinear theories. The STO head senses the media field as a modulation in the oscillation frequency, enabling high signal Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by FM (frequency modulation) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are obtained even in nonlinear STOs less than 30 ? 30 nm2 in size.
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Numerical Simulation on Temporal Response of Spin-Torque Oscillator to Magnetic Pulses
Applied Physics Express, 2010Co-Authors: Kiwamu Kudo, K Mizushima, T Nagasawa, Hirofumi Suto, Rie SatoAbstract:For the application of the spin-torque oscillator to a high-Data-Transfer-Rate read head, it is indispensable that the oscillation frequency responds promptly to the magnetic field from recorded bits. In this paper, we numerically exemplify the phase response to a short magnetic pulse. The phase basically follows the magnetic pulse although it takes several nanoseconds to return to the steady state because of the frequency nonlinearity. We also demonstRate the differential detection of recorded bits at the Data-Transfer Rate beyond 5 Gbit/s.
K Mizushima - One of the best experts on this subject based on the ideXlab platform.
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Simulations and Experiments Toward High-Data-Transfer-Rate Readers Composed of a Spin-Torque Oscillator
IEEE Transactions on Magnetics, 2012Co-Authors: Rie Sato, T Nagasawa, Kiwamu Kudo, Hirofumi Suto, K MizushimaAbstract:High-Data-Transfer-Rate readers beyond 3 Gbit/s composed of spin-torque oscillators (STOs) are considered and the signal-to-noise ratios (SNRs) of the output signals under the thermal magnetization fluctuations are calculated by using the recent nonlinear theories. The “STO Reader” senses the media field as a modulation in the oscillation frequency, enabling high-Data-Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by frequency modulation (FM) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in nonlinear STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are expected even in nonlinear STOs less than 30×30 nm2 in size. The prompt response of the STO frequency (phase) to the media field and the high-Data-Transfer Rate beyond 5 Gbit/s are shown by micromagnetic simulation. The frequency transition of STO in less than 1 ns under the pulse field is also confirmed by experiment.
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High-Data-Transfer-Rate read heads composed of spin-torque oscillators
Journal of Physics: Conference Series, 2011Co-Authors: K Mizushima, Kiwamu Kudo, T Nagasawa, Rie SatoAbstract:The signal-to-noise ratios (SNRs) of the high-Data-Transfer-Rate read heads beyond 3 Gbits/s composed of spin-torque oscillators (STOs) are calculated under the thermal magnetization fluctuations by using the recent nonlinear theories. The STO head senses the media field as a modulation in the oscillation frequency, enabling high signal Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by FM (frequency modulation) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are obtained even in nonlinear STOs less than 30 ? 30 nm2 in size.
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Numerical Simulation on Temporal Response of Spin-Torque Oscillator to Magnetic Pulses
Applied Physics Express, 2010Co-Authors: Kiwamu Kudo, K Mizushima, T Nagasawa, Hirofumi Suto, Rie SatoAbstract:For the application of the spin-torque oscillator to a high-Data-Transfer-Rate read head, it is indispensable that the oscillation frequency responds promptly to the magnetic field from recorded bits. In this paper, we numerically exemplify the phase response to a short magnetic pulse. The phase basically follows the magnetic pulse although it takes several nanoseconds to return to the steady state because of the frequency nonlinearity. We also demonstRate the differential detection of recorded bits at the Data-Transfer Rate beyond 5 Gbit/s.
T Nagasawa - One of the best experts on this subject based on the ideXlab platform.
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Simulations and Experiments Toward High-Data-Transfer-Rate Readers Composed of a Spin-Torque Oscillator
IEEE Transactions on Magnetics, 2012Co-Authors: Rie Sato, T Nagasawa, Kiwamu Kudo, Hirofumi Suto, K MizushimaAbstract:High-Data-Transfer-Rate readers beyond 3 Gbit/s composed of spin-torque oscillators (STOs) are considered and the signal-to-noise ratios (SNRs) of the output signals under the thermal magnetization fluctuations are calculated by using the recent nonlinear theories. The “STO Reader” senses the media field as a modulation in the oscillation frequency, enabling high-Data-Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by frequency modulation (FM) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in nonlinear STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are expected even in nonlinear STOs less than 30×30 nm2 in size. The prompt response of the STO frequency (phase) to the media field and the high-Data-Transfer Rate beyond 5 Gbit/s are shown by micromagnetic simulation. The frequency transition of STO in less than 1 ns under the pulse field is also confirmed by experiment.
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High-Data-Transfer-Rate read heads composed of spin-torque oscillators
Journal of Physics: Conference Series, 2011Co-Authors: K Mizushima, Kiwamu Kudo, T Nagasawa, Rie SatoAbstract:The signal-to-noise ratios (SNRs) of the high-Data-Transfer-Rate read heads beyond 3 Gbits/s composed of spin-torque oscillators (STOs) are calculated under the thermal magnetization fluctuations by using the recent nonlinear theories. The STO head senses the media field as a modulation in the oscillation frequency, enabling high signal Transfer Rates beyond the limit of ferromagnetic relaxation. The output (digital) signal is obtained by FM (frequency modulation) detection, which is commonly used in communication technologies. As the problem of rapid phase diffusion in STOs caused by the thermal fluctuations is overcome by employing a delay detection method, the sufficiently large SNRs are obtained even in nonlinear STOs less than 30 ? 30 nm2 in size.
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Numerical Simulation on Temporal Response of Spin-Torque Oscillator to Magnetic Pulses
Applied Physics Express, 2010Co-Authors: Kiwamu Kudo, K Mizushima, T Nagasawa, Hirofumi Suto, Rie SatoAbstract:For the application of the spin-torque oscillator to a high-Data-Transfer-Rate read head, it is indispensable that the oscillation frequency responds promptly to the magnetic field from recorded bits. In this paper, we numerically exemplify the phase response to a short magnetic pulse. The phase basically follows the magnetic pulse although it takes several nanoseconds to return to the steady state because of the frequency nonlinearity. We also demonstRate the differential detection of recorded bits at the Data-Transfer Rate beyond 5 Gbit/s.
