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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Spin–Spin Coupling: One-Bond Coupling01:17

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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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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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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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Dynamical Strain-Driven Phase Separation in Flexible CoFe2O4/CoO Exchange Coupling System.

Thai Duy Ha1, Jia-Wei Chen2, Min Yen2

  • 1Department of Electrophyics, National Chiao Tung University, Hsinchu 30010, Taiwan.

ACS Applied Materials & Interfaces
|September 21, 2020
PubMed
Summary

Flexible cobalt ferrite (CoFe2O4) and cobaltous oxide (CoO) bilayers show enhanced exchange bias. Bending induces a new phase, causing anomalous magnetic hysteresis for spintronic devices.

Keywords:
cobalt ferriteexchange biasflexiblemagnetic anisotropyphase separation

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Exchange bias is a critical phenomenon in spintronics, typically observed in ferromagnet/antiferromagnet bilayers.
  • Flexible electronic devices require novel heterostructures that maintain their magnetic properties under mechanical strain.
  • Epitaxial growth of oxide heterostructures on flexible substrates presents unique challenges and opportunities.

Purpose of the Study:

  • To investigate the exchange bias phenomenon in epitaxial cobalt ferrite (CoFe2O4, CFO) / cobaltous oxide (CoO) bilayers on a flexible substrate.
  • To understand the influence of CFO thickness and substrate bending on the magnetic properties and phase evolution.
  • To explore the potential of these flexible heterostructures for spintronic applications.

Main Methods:

  • Fabrication of epitaxial CFO/CoO bilayers on flexible muscovite mica using pulsed laser deposition.
  • Characterization of magnetic properties through magnetic measurements, including analysis of exchange bias.
  • Spectroscopic analysis using Raman and X-ray absorption to probe material phase and cation redistribution.

Main Results:

  • Significant enhancement in exchange bias features was observed with varying CFO thicknesses.
  • Spectroscopic data revealed the emergence of a new phase within the CFO layer due to cation charge redistribution under bending.
  • Anomalous hysteresis loops were observed in the bent bilayers, directly linked to the induced phase and cation redistribution.

Conclusions:

  • The study provides fundamental insights into the mechanisms governing exchange bias in flexible CFO/CoO bilayers.
  • Cation charge redistribution in CFO under bending is identified as the cause of anomalous magnetic behavior.
  • These flexible CFO/CoO heterostructures show promise for the development of next-generation flexible spintronic devices.