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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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...
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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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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Related Experiment Video

Updated: May 24, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Enhanced Field-Like Torque Generated from the Anisotropic Spin-Split Effect in Triple-Domain RuO2 for

Thi Van Anh Nguyen1,2, Hiroshi Naganuma1,2,3,4, Thi Ngoc Huyen Vu5

  • 1Center for Science and Innovation in Spintronics (Core Research Cluster), Tohoku University, Katahira 2-1-1, Aoba ku, Sendai, Miyagi, 980-0812, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 28, 2025
PubMed
Summary

Spin-orbit torque (SOT) in antiferromagnetic Ruthenium Dioxide (RuO2) is generated by an anisotropic spin-split effect, crucial for energy-efficient spintronic devices. This study confirms out-of-plane spin-current generation independent of the Néel vector, enabling enhanced SOT performance.

Keywords:
altermagnet RuO2field‐like torquemagnetic random‐access memoryspin‐orbit torquespin‐split effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Antiferromagnetic materials offer potential for energy-efficient spintronic devices.
  • Spin-orbit torque (SOT) in antiferromagnets is a key phenomenon for advanced memory applications.
  • Ruthenium Dioxide (RuO2) exhibits unique symmetry properties relevant for spin-current generation.

Purpose of the Study:

  • To investigate spin-current generation via the anisotropic spin-split effect in antiferromagnetic RuO2.
  • To analyze the role of RuO2 symmetry in spin-orbit torque (SOT).
  • To evaluate the potential of RuO2 for energy-efficient SOT magnetic random-access memory (SOT-MRAM).

Main Methods:

  • Fabrication of a high-quality RuO2 (100) epitaxial film with a triple-domain structure.
  • Experimental analysis of out-of-plane spin-current generation.
  • Measurement and comparison of spin-orbit torque efficiencies (field-like and Slonczewski-like).
  • Micromagnetic simulations to assess switching voltage reduction.

Main Results:

  • Out-of-plane spin-current generation in RuO2 is confirmed to be independent of the Néel vector.
  • Equal SOT values were observed for two orthogonal currents due to Néel vector independence.
  • The spin-split effect-induced SOT exhibits a field-like torque efficiency six times higher than Slonczewski-like torque efficiency.
  • Micromagnetic simulations indicate a 2.6-fold reduction in critical switching voltage in the sub-nanosecond regime.

Conclusions:

  • The Néel vector independence of out-of-plane spin current in RuO2 facilitates efficient SOT.
  • High field-like torque efficiency in RuO2 is promising for reducing switching energy in SOT devices.
  • These findings advance the development of highly energy-efficient antiferromagnetic-based SOT-MRAM.