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Related Concept Videos

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Thermal Measurement Techniques in Analytical Microfluidic Devices
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Thermal skyrmion diffusion used in a reshuffler device.

Jakub Zázvorka1,2, Florian Jakobs3, Daniel Heinze1

  • 1Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany.

Nature Nanotechnology
|April 24, 2019
PubMed
Summary
This summary is machine-generated.

We uncovered thermal diffusive skyrmion dynamics in thin films, revealing an exponential temperature dependence. This finding opens new avenues for probabilistic computing devices and understanding soft-matter physics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic skyrmions are promising for spintronic devices due to their efficient displacement via spin-transfer and spin-orbit torques.
  • Research on thermal effects on skyrmion dynamics is limited, despite potential applications in unconventional computing.

Purpose of the Study:

  • To investigate thermal diffusive skyrmion dynamics in thin films.
  • To explore the potential of thermally induced skyrmion motion for probabilistic computing.

Main Methods:

  • Experimental probing of magnetic skyrmion dynamics in a low-pinning multilayer material.
  • Numerical simulations to confirm observed phenomena.
  • Analysis of skyrmion diffusion as a function of temperature.

Main Results:

  • Thermally excited skyrmion motion was observed to dominate dynamics.
  • An exponential dependence of skyrmion diffusion on temperature was identified.
  • Skyrmion diffusion was successfully implemented in a signal reshuffling device for probabilistic computing.

Conclusions:

  • Thermal diffusive dynamics are a key aspect of magnetic skyrmion behavior in thin films.
  • The findings support the use of skyrmions in probabilistic computing architectures.
  • Studying thermal effects in skyrmion systems offers insights into soft-matter physics.