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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.4K
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.
A magnetic field is defined by the force that a charged particle experiences...
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Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Generalised level anticrossings explain improved 19F SABRE hyperpolarisation under oscillating magnetic fields.

Joni Eronen1, Perttu Hilla1, Vladimir V Zhivonitko1

  • 1NMR Research Unit, University of Oulu, P.O. Box 3000, Oulu, FI-90014, Finland. joni.eronen@oulu.fi.

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Signal amplification by reversible exchange (SABRE) uses oscillating fields to boost hyperpolarization. This new method enhances 19F signals by 79%, improving magnetic resonance applications.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Chemistry
  • Biophysics

Background:

  • Signal amplification by reversible exchange (SABRE) is a parahydrogen-based hyperpolarization technique.
  • Conventional SABRE utilizes a static polarization transfer field near the level anticrossing (LAC) condition.
  • Oscillating fields have shown potential to significantly increase hyperpolarization levels.

Purpose of the Study:

  • To develop a generalized theoretical model for SABRE under oscillating fields.
  • To optimize oscillating fields for maximum 19F polarization transfer.
  • To suppress scalar relaxation of the second kind simultaneously.

Main Methods:

  • Development of a generalized LAC condition for oscillating fields.
  • Spin dynamics simulations.
  • Experimental validation of the theoretical model and optimization strategy.

Main Results:

  • A 79% experimental improvement in 19F hyperpolarization compared to conventional SABRE.
  • Demonstration of simultaneous suppression of scalar relaxation of the second kind.
  • Validation of the generalized LAC condition for explaining spin dynamics.

Conclusions:

  • The developed theoretical model accurately describes SABRE with oscillating fields.
  • Optimized oscillating fields significantly enhance 19F hyperpolarization.
  • This strategy advances SABRE's potential for biomedical and other applications.