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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Spin-wave interference patterns created by spin-torque nano-oscillators for memory and computation.

Ferran Macià1, Andrew D Kent, Frank C Hoppensteadt

  • 1Department of Physics, New York University, New York, NY 10003, USA. fmb2@nyu.edu

Nanotechnology
|January 25, 2011
PubMed
Summary
This summary is machine-generated.

Spin-wave excitations in nanomagnets, driven by spin momentum transfer, can be used for advanced information processing. This study demonstrates spin-wave interference patterns for memory and computation using nano-oscillators and memristic transponders.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Spin-wave excitations in nanomagnets are generated by spin momentum transfer from DC currents.
  • Spin momentum transfer enables novel information processing paradigms.

Purpose of the Study:

  • To demonstrate the creation of propagating spin-wave interference patterns using arrays of spin-torque nano-oscillators.
  • To explore the use of memristic transponders for spin-wave detection and pattern generation.
  • To investigate resonant spin-wave interference for polychronous wave computation and data storage.

Main Methods:

  • Utilizing arrays of spin-torque nano-oscillators to generate spin waves.
  • Integrating memristic transponders to detect spin waves based on threshold tunnel magnetoresistance.
  • Analyzing resonant spin-wave interference patterns generated by groups of transponders.

Main Results:

  • Successfully created propagating spin-wave interference patterns.
  • Demonstrated spin-wave detection and novel excitation patterns using memristic transponders.
  • Observed resonant (reverberating) spin-wave interference patterns.

Conclusions:

  • Spin-wave interference patterns generated by nano-oscillators and memristors are suitable for memory and computation.
  • The proposed system enables polychronous wave computation and information storage applications.