The Experts below are selected from a list of 91605 Experts worldwide ranked by ideXlab platform
Teruo Ono - One of the best experts on this subject based on the ideXlab platform.
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Magnetic Domain writing defined by electrical gating in pt co film
Applied Physics Letters, 2018Co-Authors: Fuyuki Ando, Takahiro Moriyama, Teruo Ono, Daichi Chiba, Mio Ishibashi, Tomohiro Koyama, Yoichi ShiotaAbstract:There is a need to control Magnetic properties at a desired location in a Magnetic film towards a realization of fundamental devices, such as Domain wall logic or magnonic applications. Here, we demonstrate the formation of a Magnetic Domain structure at a desired location in a Pt/Co film, using electrical gating with a meshed gate electrode and sweeping the applied Magnetic field. As the Magnetic properties can be changed by modulating the electron density at the surface of the Co layer, this method in principle provides higher speed and power-efficient operation in inducing a nanoscale Domain structure or in configuring a volatile magnonic crystal.There is a need to control Magnetic properties at a desired location in a Magnetic film towards a realization of fundamental devices, such as Domain wall logic or magnonic applications. Here, we demonstrate the formation of a Magnetic Domain structure at a desired location in a Pt/Co film, using electrical gating with a meshed gate electrode and sweeping the applied Magnetic field. As the Magnetic properties can be changed by modulating the electron density at the surface of the Co layer, this method in principle provides higher speed and power-efficient operation in inducing a nanoscale Domain structure or in configuring a volatile magnonic crystal.
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20 nm Magnetic Domain wall motion memory with ultralow power operation
International Electron Devices Meeting, 2013Co-Authors: Shunsuke Fukami, Tetsuhiro Suzuki, M Yamanouchi, Kabjin Kim, Noboru Sakimura, Daichi Chiba, S Ikeda, Tadahiko Sugibayashi, Naoki Kasai, Teruo OnoAbstract:We study the write and retention properties of Magnetic Domain wall (DW)-motion memory devices with the dimensions down to 20 nm. We find that the write current and time are scaled along with device size while sufficient thermal stability and low error rate are maintained. As a result, ultralow-power (a few fJ) and reliable operation is possible even at reduced dimensions.
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Magnetic Domain Wall Oscillator
Applied Physics Express, 2008Co-Authors: Teruo Ono, Yoshinobu NakataniAbstract:We show that the rotation of a Magnetic Domain wall (DW) can be induced by the injection of a dc current into a Magnetic wire with a DW. A novel three-terminal device that produces microwaves by utilizing the current-induced DW rotation is proposed. The frequency of the microwaves can be tuned by adjusting the current density through the wire, and the amplitude of the microwaves can be regulated through a dc bias applied to the Magnetic tunnel junction.
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Propagation of a Magnetic Domain wall in a submicrometer Magnetic wire
Science (New York N.Y.), 1999Co-Authors: Teruo Ono, Hideki Miyajima, K. Shigeto, Ko Mibu, Nobuyoshi Hosoito, Teruya ShinjoAbstract:The motion of a Magnetic Domain wall in a submicrometer Magnetic wire was detected by use of the giant magnetoresistance effect. Magnetization reversal in a submicrometer Magnetic wire takes place by the propagation of a Magnetic Domain wall, which can be treated as a “particle.” The propagation velocity of the Magnetic Domain wall was determined as a function of the applied Magnetic field.
R Schafer - One of the best experts on this subject based on the ideXlab platform.
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in situ visualization of stress dependent bulk Magnetic Domain formation by neutron grating interferometry
Applied Physics Letters, 2016Co-Authors: Benedikt Betz, R Schafer, P Rauscher, R P Harti, H Van Swygenhoven, Anders Kaestner, Jan Hovind, Eberhard Lehmann, C GrunzweigAbstract:The performance and degree of efficiency of industrial transformers are directly influenced by the Magnetic properties of high-permeability steel laminations (HPSLs). Industrial transformer cores are built of stacks of single HPSLs. While the insulating coating on each HPSL reduces eddy-current losses in the transformer core, the coating also induces favorable inter-granular tensile stresses that significantly influence the underlying Magnetic Domain structure. Here, we show that the neutron dark-field image can be used to analyze the influence of the coating on the volume and supplementary surface Magnetic Domain structures. To visualize the stress effect of the coating on the bulk Domain formation, we used an uncoated HPSL and stepwise increased the applied external tensile stress up to 20 MPa. We imaged the Domain configuration of the intermediate stress states and were able to reproduce the original Domain structure of the coated state. Furthermore, we were able to visualize how the applied stresses l...
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neutron decoherence imaging for visualizing bulk Magnetic Domain structures
Physical Review Letters, 2008Co-Authors: C Grunzweig, R Schafer, C David, O Bunk, Martin Dierolf, Gabriel Frei, G Kuhne, J Kohlbrecher, Pavel Lejcek, H M RonnowAbstract:Here we introduce a novel neutron imaging method, which is based on the effect that the spatial coherence of the neutron wave front can be changed through small-angle scattering of neutrons at Magnetic Domain walls in the specimen. We show that the technique can be used to visualize internal bulk Magnetic Domain structures that are difficult to access by other techniques. The method is transferable to a wide variety of specimens, extendable to three dimensions, and well suited for investigating materials under the influence of external parameters, as, e.g., external Magnetic field, temperature, or pressure.
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absence of Magnetic Domain wall motion during Magnetic field induced twin boundary motion in bulk Magnetic shape memory alloys
Applied Physics Letters, 2007Co-Authors: Yiuwai Lai, Ludwig Schultz, N Scheerbaum, D Hinz, O Gutfleisch, R Schafer, J MccordAbstract:A detailed study of twin boundary motion in NiMnGa single crystals together with in situ Magnetic Domain observation is presented. Optical polarization microscopy in connection with a magneto-optical indicator film technique was used to investigate the reorganization of the Magnetic Domains during twin boundary motion over a wide Magnetic field range. Images at different field strengths demonstrate that no Magnetic Domain wall motion within the twins takes place, even during the structural reorientation by twin boundary movement. This absence of interaction of Magnetic and structural Domains is different from currently proposed models, which assume Domain wall movement under an external field.
J Mccord - One of the best experts on this subject based on the ideXlab platform.
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absence of Magnetic Domain wall motion during Magnetic field induced twin boundary motion in bulk Magnetic shape memory alloys
Applied Physics Letters, 2007Co-Authors: Yiuwai Lai, Ludwig Schultz, N Scheerbaum, D Hinz, O Gutfleisch, R Schafer, J MccordAbstract:A detailed study of twin boundary motion in NiMnGa single crystals together with in situ Magnetic Domain observation is presented. Optical polarization microscopy in connection with a magneto-optical indicator film technique was used to investigate the reorganization of the Magnetic Domains during twin boundary motion over a wide Magnetic field range. Images at different field strengths demonstrate that no Magnetic Domain wall motion within the twins takes place, even during the structural reorientation by twin boundary movement. This absence of interaction of Magnetic and structural Domains is different from currently proposed models, which assume Domain wall movement under an external field.
Lucas Pérez - One of the best experts on this subject based on the ideXlab platform.
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Observation of a topologically protected state in a Magnetic Domain wall stabilized by a ferroMagnetic chemical barrier
Scientific Reports, 2018Co-Authors: Sandra Ruiz-gómez, Michael Foerster, Lucia Aballe, Mariana P. Proenca, Irene Lucas, José Luis Prieto, Arantzazu Mascaraque, Juan De La Figuera, Adrián Quesada, Lucas PérezAbstract:The precise control and stabilization of Magnetic Domain walls is key for the development of the next generation Magnetic nano-devices. Among the multitude of Magnetic configurations of a Magnetic Domain wall, topologically protected states are of particular interest due to their intrinsic stability. In this work, using XMCD-PEEM, we have observed a topologically protected Magnetic Domain wall in a ferroMagnetic cylindrical nanowire. Its structure is stabilized by periodic sharp alterations of the chemical composition in the nanowire. The large stability of this topologically protected Domain wall contrasts with the mobility of other non-protected and non-chiral states also present in the same nanowire. The microMagnetic simulations show the structure and the conditions required to find the topologically protected state. These results are relevant for the design of future spintronic devices such as Domain wall based RF oscillators or Magnetic memories.
Sebastiaan Van Dijken - One of the best experts on this subject based on the ideXlab platform.
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tunable short wavelength spin wave excitation from pinned Magnetic Domain walls
Scientific Reports, 2016Co-Authors: Ben Van De Wiele, Sampo J. Hämäläinen, Pavel Balaž, F Montoncello, Sebastiaan Van DijkenAbstract:Miniaturization of magnonic devices for wave-like computing requires emission of short-wavelength spin waves, a key feature that cannot be achieved with microwave antennas. In this paper, we propose a tunable source of short-wavelength spin waves based on highly localized and strongly pinned Magnetic Domain walls in ferroelectric-ferroMagnetic bilayers. When driven into oscillation by a microwave spin-polarized current, the Magnetic Domain walls emit spin waves with the same frequency as the excitation current. The amplitude of the emitted spin waves and the range of attainable excitation frequencies depend on the availability of Domain wall resonance modes. In this respect, pinned Domain walls in Magnetic nanowires are particularly attractive. In this geometry, spin wave confinement perpendicular to the nanowire axis produces a multitude of Domain wall resonances enabling efficient spin wave emission at frequencies up to 100 GHz and wavelengths down to 20 nm. At high frequency, the emission of spin waves in Magnetic nanowires becomes monochromatic. Moreover, pinning of Magnetic Domain wall oscillators onto the same ferroelectric Domain boundary in parallel nanowires guarantees good coherency between spin wave sources, which opens perspectives towards the realization of Mach-Zehnder type logic devices and sensors.
