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Related Concept Videos

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Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Superconductor01:24

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Hybrid superconducting-magnetic memory device using competing order parameters.

Burm Baek1, William H Rippard1, Samuel P Benz1

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

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|May 29, 2014
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Summary
This summary is machine-generated.

Researchers developed a novel Josephson junction with a magnetic spin valve. This hybrid device enables tunable, non-volatile switching of superconducting properties, paving the way for nanoscale superconducting memory.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing Hardware

Background:

  • Superconducting and magnetic properties are being explored for novel memory devices.
  • Competing order parameters in hybrid devices present challenges and opportunities.
  • Ultra-low-power, high-density cryogenic memory is a key technological goal.

Purpose of the Study:

  • To create novel switching elements by exploiting competing superconducting and magnetic orders.
  • To investigate a reconfigurable two-layer magnetic spin valve integrated within a Josephson junction.
  • To separate and analyze the suppression of superconducting coupling caused by exchange fields versus stray magnetic fields.

Main Methods:

  • Fabrication of a hybrid superconducting-magnetic device featuring a Josephson junction with a two-layer magnetic spin valve.
  • Experimental measurements to distinguish the effects of exchange fields and stray magnetic fields on superconducting coupling.
  • Characterization of the tunability, switchability, and scalability of the observed phenomena.

Main Results:

  • Successfully separated superconducting coupling suppression due to exchange field depairing from stray magnetic field effects.
  • Demonstrated that exchange field suppression of the superconducting order parameter is tunable, switchable, and scalable to nanometer dimensions.
  • Observed non-volatile, size-independent switching of Josephson coupling in both magnitude and phase.

Conclusions:

  • The developed hybrid superconducting-magnetic device offers a promising route for practical nanoscale superconducting memory.
  • The tunable and switchable nature of exchange field suppression is key to novel memory functionalities.
  • These findings enable the development of advanced cryogenic memory technologies.