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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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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?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Thermal Strain01:19

Thermal Strain

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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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G-protein Coupled Receptors01:21

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Magnetic Hysteresis in Nanostructures with Thermally Controlled RKKY Coupling.

Dmytro Polishchuk1,2, Yuliya Tykhonenko-Polishchuk1,2, Vladyslav Borynskyi2

  • 1Nanostructure Physics, Royal Institute of Technology, 10691, Stockholm, Sweden.

Nanoscale Research Letters
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This study explores how temperature controls magnetic coupling in multilayer films. Understanding these interactions is key for developing new magnetic memory technologies.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Indirect exchange coupling in magnetic multilayers is crucial for spintronic devices.
  • Ex-situ thermal control offers a promising method for tuning magnetic properties.

Purpose of the Study:

  • To elucidate the mechanisms behind ex-situ thermal control of indirect exchange coupling.
  • To analyze temperature-induced changes in magnetization hysteresis.
  • To investigate competing interlayer exchange interactions in different spacer layer designs.

Main Methods:

  • Experimental investigation of magnetic multilayers with varying spacer layers.
  • Analysis of temperature-dependent magnetization hysteresis loops.
  • Theoretical modeling of interlayer exchange interactions and magnetic anisotropy.

Main Results:

  • Temperature-induced magnetization changes are linked to competing interlayer exchange interactions.
  • Local in-plane magnetic anisotropy of nanocrystallites explains magnetization loop shapes.
  • Mechanisms of magnetization switching were contrasted based on RKKY and non-RKKY interactions.

Conclusions:

  • The study details the complex magnetic phase space of the system.
  • Findings facilitate practical application of RKKY interactions for thermal magnetization switching.
  • Results pave the way for advanced magnetic memory and logic devices.