The Experts below are selected from a list of 20541 Experts worldwide ranked by ideXlab platform

Yoshinori Tokura - One of the best experts on this subject based on the ideXlab platform.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is 10-10$^4$ Hz at $\sim$10$^{9}$ A/m$^{2}$, implying a skyrmion steady flow velocity of 1-100 $\mu$m/s, 3-5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is $10--{10}^{4}$ Hz at $\ensuremath{\sim}{10}^{9}\phantom{\rule{4pt}{0ex}}\mathrm{A}/{\mathrm{m}}^{2}$, implying a skyrmion steady-flow velocity of $1--100\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}/\mathrm{s}$, 3--5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

Naoto Nagaosa - One of the best experts on this subject based on the ideXlab platform.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is 10-10$^4$ Hz at $\sim$10$^{9}$ A/m$^{2}$, implying a skyrmion steady flow velocity of 1-100 $\mu$m/s, 3-5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is $10--{10}^{4}$ Hz at $\ensuremath{\sim}{10}^{9}\phantom{\rule{4pt}{0ex}}\mathrm{A}/{\mathrm{m}}^{2}$, implying a skyrmion steady-flow velocity of $1--100\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}/\mathrm{s}$, 3--5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

Hiroshi Oike - One of the best experts on this subject based on the ideXlab platform.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is 10-10$^4$ Hz at $\sim$10$^{9}$ A/m$^{2}$, implying a skyrmion steady flow velocity of 1-100 $\mu$m/s, 3-5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is $10--{10}^{4}$ Hz at $\ensuremath{\sim}{10}^{9}\phantom{\rule{4pt}{0ex}}\mathrm{A}/{\mathrm{m}}^{2}$, implying a skyrmion steady-flow velocity of $1--100\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}/\mathrm{s}$, 3--5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

E. Charlaix - One of the best experts on this subject based on the ideXlab platform.

  • Slow kinetics of capillary condensation in Confined Geometry: experiment and theory
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2002
    Co-Authors: Frédéric Restagno, Lydéric Bocquet, Jérôme Crassous, E. Charlaix
    Abstract:

    When two solid surfaces are brought in contact, water vapor present in the ambient air may condense in the region of the contact to form a liquid bridge connecting the two surfaces: this is the so-called capillary condensation. This phenomenon has drastic consequences on the contact between solids, modifying the macroscopic adhesion and friction properties. In this paper, we present a survey of the work we have performed both experimentally and theoretically to understand the microscopic foundations of the kinetics of capillary condensation. From the theoretical point of view, we have computed the free energy barrier associated with the condensation of the liquid from the gas in a Confined system. These calculations allow understanding of the existence of very large hysteresis, which is often associated with capillary condensation. These results are compatible with experimental results obtained with a surface forces apparatus in a vapor atmosphere, showing a large hysteresis of the surface energy of two parallel planes as a function of their distance. In the second part, we present some experiments on the influence of humidity on the avalanche angle of granular media. We show that the aging in time of this avalanche angle can be explained by the slow kinetics of capillary condensation in a random Confined Geometry.

  • Slow Kinetics of Capillary Condensation in Confined Geometry: Experiment and Theory
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2002
    Co-Authors: Frédéric Restagno, Lydéric Bocquet, Jérôme Crassous, E. Charlaix
    Abstract:

    When two solid surfaces are brought in contact, water vapor present in the ambient air may condense in the region of the contact to form a liquid bridge connecting the two surfaces : this is the so-called capillary condensation. This phenomenon has drastic consequences on the contact between solids, modifying the macroscopic adhesion and friction properties. In this paper, we present a survey of the work we have performed both experimentally and theoretically to understand the microscopic foundations of the kinetics of capillary condensation. From the theoretical point of view, we have computed the free energy barrier associated with the condensation of the liquid from the gas in a Confined system. These calculations allow to understand the existence of very large hysteresis, which is often associated with capillary condensation. This results are compatible with experimental results obtained with a surface forces apparatus in a vapor atmosphere, showing a large hysteris of the surface energy of two parallel planes as a function of their distance. In the second part, we present some experiments on the influence of humidity on the avalanche angle of granular media. We show that the ageing in time of this avalanche angle can be explained by the slow kinetics of capillary condensation in a random Confined Geometry.

Takuro Sato - One of the best experts on this subject based on the ideXlab platform.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is 10-10$^4$ Hz at $\sim$10$^{9}$ A/m$^{2}$, implying a skyrmion steady flow velocity of 1-100 $\mu$m/s, 3-5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.

  • slow steady flow of a skyrmion lattice in a Confined Geometry probed by narrow band resistance noise
    Physical Review B, 2019
    Co-Authors: Takuro Sato, Wataru Koshibae, A Kikkawa, Tomoyuki Yokouchi, Hiroshi Oike, Y Taguchi, Naoto Nagaosa, Yoshinori Tokura
    Abstract:

    Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is $10--{10}^{4}$ Hz at $\ensuremath{\sim}{10}^{9}\phantom{\rule{4pt}{0ex}}\mathrm{A}/{\mathrm{m}}^{2}$, implying a skyrmion steady-flow velocity of $1--100\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}/\mathrm{s}$, 3--5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.