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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Time-resolved imaging of three-dimensional nanoscale magnetization dynamics.

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This study introduces time-resolved magnetic laminography to visualize 3D magnetic microdisc dynamics with nanoscale resolution. The technique reveals transitions between domain wall motion and uniform magnetic domains in response to magnetic fields.

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Area of Science:

  • Magnetism and Spintronics
  • Materials Science
  • Nanotechnology

Background:

  • Understanding 3D magnetic material dynamics is crucial for fundamental science and technological applications like sensors and data storage.
  • Internal magnetic structure and dynamics, including topological structures, require further mapping.
  • The response of inductive materials to magnetic fields and spin currents is vital for device performance.

Purpose of the Study:

  • To demonstrate a novel pump-probe technique for imaging the temporal evolution of 3D magnetization.
  • To achieve nanoscale resolution and picosecond-level temporal resolution for dynamic magnetic studies.
  • To investigate the complex 3D magnetization dynamics in a bulk magnetic material.

Main Methods:

  • Development and application of time-resolved magnetic laminography.
  • Utilizing a pump-probe approach with synchrotron radiation for high temporal resolution (70 ps).
  • Employing stroboscopic measurements with a lateral spatial resolution of 50 nm to capture dynamics over 2 ns.

Main Results:

  • Successfully imaged the dynamic response of a 3D magnetic microdisc to a 500 MHz magnetic field.
  • Mapped the spatial transition between domain wall motion and uniform magnetic domain dynamics.
  • Attributed observed dynamics to variations in magnetization state across a phase boundary in a two-phase bulk magnet.

Conclusions:

  • Time-resolved magnetic laminography provides unprecedented access to 3D magnetic structure dynamics.
  • The technique enables experimental investigation of dynamic phenomena in bulk and patterned nanomagnets.
  • This advancement facilitates the study of functionalities arising from complex magnetic dynamics.