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NMR Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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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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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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Exchange coupling between laterally adjacent nanomagnets.

H Dey, G Csaba, G H Bernstein

    Nanotechnology
    |August 19, 2016
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrated a new method for strong ferromagnetic coupling between adjacent nanomagnets using a shared ferromagnetic layer. This technique overcomes limitations of dipole coupling and enables advanced spintronic applications.

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    Area of Science:

    • Condensed Matter Physics
    • Materials Science
    • Nanotechnology

    Background:

    • Exchange coupling is crucial for controlling magnetic interactions in nanomaterials.
    • Existing dipole coupling between nanomagnets is typically weak and limits device performance.
    • Developing methods for strong, tunable coupling is essential for next-generation magnetic devices.

    Purpose of the Study:

    • To experimentally demonstrate and validate a novel scheme for achieving strong ferromagnetic exchange coupling between laterally adjacent nanomagnets.
    • To investigate the role of a common ferromagnetic layer in mediating this interaction.
    • To compare the effectiveness of exchange coupling against conventional dipole coupling.

    Main Methods:

    • Fabrication of arrays of paired, elongated, single-domain nanomagnets.
    • Utilizing a common ferromagnetic bottom layer to induce interlayer exchange coupling.
    • Experimental characterization using magnetic force microscopy (MFM).
    • Validation through micromagnetic simulations.

    Main Results:

    • Experimental evidence of strong ferromagnetic interaction between adjacent nanomagnets.
    • Demonstration that interlayer exchange coupling promotes ferromagnetic alignment, overcoming dipole-induced antiferromagnetic tendencies.
    • High degree of ferromagnetic ordering observed in fabricated nanomagnet pairs.
    • Agreement between experimental findings and micromagnetic simulations.

    Conclusions:

    • A viable method for achieving strong ferromagnetic coupling between adjacent nanomagnets via a shared ferromagnetic layer has been experimentally validated.
    • This exchange-coupling scheme offers significantly stronger interactions than dipole coupling.
    • The demonstrated technique holds potential for advancing Nanomagnet Logic, spin-wave devices, and 3D magnetic storage and computing.