Magnetic techniques

Magnetic techniques use magnetic fields or magnetic properties to detect, separate, manipulate, or study materials and signals.

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Magnetic resonance imaging: A medical imaging method that uses nuclear magnetic resonance signals to produce images of the body's interior. It turns magnetic resonance into detailed images of soft tissue without ionizing radiation.
Magnetic field: A physical field produced by electric currents, magnetic materials, and changing electric fields that exerts forces on magnetic moments and moving charges. It is the applied influence that steers, probes, or detects materials across these methods.
Nuclear magnetic resonance: A phenomenon in which nuclei with magnetic moments absorb and emit radiofrequency energy in a magnetic field. It is the signal-generating basis of several spectroscopic and imaging methods.
Electrical resistivity tomography: A geophysical imaging method that estimates subsurface resistivity from electrical current and voltage measurements. It maps electrical properties rather than magnetic responses in the ground.
Magnetic particle inspection: A nondestructive testing method that reveals surface and near-surface flaws in ferromagnetic materials using magnetic particles. It uses particle patterns around magnetic leakage fields to expose cracks.
Magnetic susceptibility: A measure of how much a material becomes magnetized in response to an applied magnetic field. Differences in susceptibility enable contrast and separation between materials.
Electron spin resonance: A spectroscopic technique that detects transitions between electron spin states in a magnetic field. It reveals unpaired electrons and their chemical environments through magnetic resonance.
X-ray computed tomography: An imaging method that reconstructs cross-sectional views from X-ray attenuation measurements taken at multiple angles. It images density and composition using ionizing radiation instead of magnetic resonance.
Magnetic separation: A process that separates materials according to their response to a magnetic field. It applies magnetic attraction or repulsion to sort mixtures and recover materials.
Magnetic moment: A vector quantity that describes the strength and orientation of a magnetic source or dipole. Magnetic moments generate measurable signals and respond to applied fields.