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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Spin–Spin Coupling Constant: Overview01:08

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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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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Nanomagnonic devices based on the spin-transfer torque.

S Urazhdin1, V E Demidov2, H Ulrichs2

  • 1Department of Physics, Emory University, Atlanta, Georgia 30322, USA.

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Researchers integrated spin-transfer torque devices with magnonic nanowaveguides for the first time. This breakthrough enables efficient spin wave transmission, paving the way for integrated magnonic circuits.

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Area of Science:

  • Physics of spin waves (magnonics) and nanomagnetism.
  • Development of nanoscale magnetic devices and circuits.

Background:

  • Magnonics utilizes spin waves (magnons) for signal processing in magnetic materials.
  • Nanomagnonics employs nanoscale magnetic waveguides to control spin wave propagation.
  • Spin-transfer torque in nanomagnetism enables spin wave generation.

Purpose of the Study:

  • To achieve the integration of spin-transfer torque sources with nanoscale magnetic waveguides.
  • To enable the implementation of integrated spin-transfer magnonic circuits.

Main Methods:

  • Development and experimental demonstration of dipolar field-induced magnonic nanowaveguides.
  • Utilizing spin-torque nano-oscillators as nanoscale signal sources.
  • Characterizing the spectral matching and spin wave transmission efficiency.

Main Results:

  • Successful integration of spin-torque sources with magnonic nanowaveguides.
  • Demonstrated efficient and directional transmission of spin waves.
  • Achieved good spectral matching between spin-torque nano-oscillators and nanowaveguides.

Conclusions:

  • Dipolar field-induced magnonic nanowaveguides provide a practical route for integrating spin-torque sources.
  • This integration is crucial for the development of functional integrated magnonic circuits.
  • The study offers a significant step towards realizing spin-transfer-based magnonic devices.