Related Experiment Video
Updated: Jan 25, 2026
06:42
Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability
Published on: September 1, 2020
3.8K
Periodic Co/Nb pseudo spin valve for cryogenic memory
Nikolay Klenov1,2,3, Yury Khaydukov1,4,5, Sergey Bakurskiy1,2
1Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, Russia.
Beilstein Journal of Nanotechnology
|April 26, 2019
Summary
Researchers developed novel magnetic superlattices for Josephson switches. Switching magnetic layer alignment significantly enhances critical current, enabling new memory applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Superconducting devices require precise control over electronic properties.
- Ferromagnetic-superconducting heterostructures offer tunable characteristics for advanced applications.
- Josephson junctions are key components in quantum computing and sensitive detectors.
Purpose of the Study:
- To investigate magnetic superlattices with controllable effective exchange energy.
- To explore the potential of these structures for Josephson switches and memory devices.
- To demonstrate the feasibility of switching magnetic alignment for enhanced critical current.
Main Methods:
- Theoretical modeling using Usadel equations for critical current calculations.
- Fabrication of a [Co/Nb/Co/Nb] superlattice structure.
- Experimental characterization using neutron scattering and magnetometry.
Main Results:
- Calculations predict significant critical current enhancement by switching between parallel (P) and antiparallel (AP) magnetic alignments.
- A [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)]6 superlattice was successfully synthesized.
- Experimental data confirmed controllable switching between P and AP states using magnetic fields as low as tens of Oersted.
Conclusions:
- Periodic ferromagnetic-superconducting structures provide a viable platform for tunable Josephson junctions.
- The proposed pseudo spin valve design enables efficient control over magnetic alignment.
- These findings pave the way for advanced spintronic devices with enhanced performance.
Related Concept Videos
03:25The Periodic Table
109.9K
As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
109.9K
04:00Periodic Classification of the Elements
58.8K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
58.8K
01:08Spin–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...
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...
1.5K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.0K
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...
3.0K
01:17Spin–Spin Coupling: One-Bond Coupling
1.4K
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,...
1.4K
01:07Effective Value of a Periodic Waveform
1.2K
The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
The effective value of a periodic current represents the direct current (DC) that conveys the same average power to a resistor as the periodic current itself. This concept is crucial when assessing AC circuits. To determine the...
The effective value of a periodic current represents the direct current (DC) that conveys the same average power to a resistor as the periodic current itself. This concept is crucial when assessing AC circuits. To determine the...
1.2K