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Related Concept Videos

Passive Filters01:27

Passive Filters

1.0K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

14.7K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
14.7K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
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...
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Ferroelectric Control of Interface Spin Filtering in Multiferroic Tunnel Junctions.

J Tornos1, F Gallego1, S Valencia2

  • 1GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.

Physical Review Letters
|February 9, 2019
PubMed
Summary

Interface spin reconstruction in multiferroic tunnel junctions creates a tunable spin filter. This ferroelectric control enables giant electrical modulation of tunneling magnetoresistance for low-dissipation spintronics.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Oxide interfaces exhibit electronic reconstruction, offering potential for novel electronic devices.
  • Multiferroic tunnel junctions (MTJs) allow current modulation via magnetization and ferroelectric polarization switching.

Purpose of the Study:

  • Investigate spin reconstruction at oxide interfaces in MTJs.
  • Demonstrate ferroelectric control of spin filtering functionality.

Main Methods:

  • Fabrication and characterization of La_{0.7}Sr_{0.3}MnO_{3}/BaTiO_{3}/La_{0.7}Sr_{0.3}MnO_{3} MTJs.
  • Analysis of interface spin reconstruction and its effect on transport properties.

Main Results:

  • Observed spin reconstruction at the LSMO/BTO interfaces.
  • Demonstrated a tunable spin filter effect controlled by ferroelectric polarization.
  • Achieved giant electrical modulation of tunneling magnetoresistance (10% to 1000%).

Conclusions:

  • Interface spin reconstruction is the origin of the spin filter functionality.
  • Ferroelectric control of the spin filter enables significant modulation of magnetoresistance.
  • This ferroelectric spin filter could inspire low-dissipation spintronic devices.