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Nuclear Magnetic Resonance (NMR): Overview01:07

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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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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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Applications Of NMR In Biology01:25

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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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International Nursing Organization (ICN) is a global union of national nurses' organizations. Individual nurses can be a part of ICN through member organizations. Each member organization strives to ensure quality nursing care, sound health policies, the advancement of nursing knowledge, respect for the profession, and a satisfied and competent nursing workforce.
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Nonsense-mediated mRNA Decay02:27

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Related Experiment Video

Updated: Jun 12, 2025

Author Spotlight: Studying Neuromuscular Responses and Motor Neuron Plasticity in Neurodegenerative Diseases
06:08

Author Spotlight: Studying Neuromuscular Responses and Motor Neuron Plasticity in Neurodegenerative Diseases

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Towards MnN as a replacement for IrMn.

William Frost1, Fatimah Alsaud2, Robert A Lawrence2

  • 1School of Physics, Engineering and Technology, University of York, Heslington, YO10 5DD, UK. william.frost@york.ac.uk.

Scientific Reports
|September 20, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new antiferromagnetic material using a tungsten seed layer, overcoming limitations of previous alternatives to iridium-manganese alloys. This advancement offers a promising, cost-effective solution for high-temperature applications.

Keywords:
AntiferromagnetismExchange biasMnN

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Spintronics

Background:

  • There is a critical need for alternatives to iridium-manganese (IrMn) alloys in antiferromagnetic spintronic devices due to iridium's cost and scarcity.
  • Manganese nitride (MnN) on a tantalum (Ta) seed layer has been explored as a potential replacement, but faces challenges with low anisotropy and nitrogen diffusion.

Purpose of the Study:

  • To address the limitations of MnN/Ta for high-temperature antiferromagnetic applications.
  • To investigate the use of a tungsten (W) seed layer to improve MnN properties and performance.

Main Methods:

  • Fabrication of MnN thin films using a W seed layer instead of Ta.
  • Characterization of structural properties, including crystallographic texture ({111} growth).
  • Measurement of magnetic properties, specifically magnetocrystalline anisotropy.

Main Results:

  • Minimized nitrogen diffusion into the W seed layer at elevated temperatures (exceeding 500°C).
  • Achieved preferential {111} crystallographic growth of MnN.
  • Measured significantly enhanced magnetocrystalline anisotropy (), comparable to IrMn.

Conclusions:

  • The use of a W seed layer effectively suppresses nitrogen diffusion and enhances the anisotropy of MnN films.
  • This approach presents a viable pathway to develop cost-effective, high-performance antiferromagnetic materials for room-temperature and above applications, replacing expensive IrMn alloys.