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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Paramagnetism01:30

Paramagnetism

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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Diamagnetism01:26

Diamagnetism

3.1K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.1K
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...
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Magnetic Nanoplatelet-Based Spin Memory Device Operating at Ambient Temperatures.

Guy Koplovitz1,2,3, Darinka Primc4,5, Oren Ben Dor1,2

  • 1Department of Applied Physics, Hebrew University of Jerusalem, Jerusalem, 91904, Israel.

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Researchers developed a simple, silicon-based magnetic memory device using ferromagnetic nanoplatelets and the chiral-induced spin selectivity effect for potential low-power, high-frequency data storage at room temperature.

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magnetic memorymagnetic nanoparticlesmolecular electronicsself-assembled monolayersspintronics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Nonvolatile magnetic memory offers low power consumption and high frequencies but requires size reduction and material system simplification for widespread adoption.
  • Existing memory technologies face challenges in achieving both miniaturization and simplified fabrication for universal applications.
  • Silicon-based universal memory operating at ambient temperatures is highly desirable for next-generation electronics.

Purpose of the Study:

  • To realize a simple, silicon-compatible magnetic memory device utilizing the chiral-induced spin selectivity (CISS) effect.
  • To investigate the feasibility of using ferromagnetic nanoplatelets for scalable, nonvolatile memory applications.
  • To demonstrate dual magnetization behavior and analyze noise characteristics in the developed memory device.

Main Methods:

  • Fabrication of a vertical memory device using 30-50 nm ferromagnetic nanoplatelets integrated with silicon.
  • Application of the chiral-induced spin selectivity (CISS) effect to control magnetization.
  • Characterization of magnetization states and analysis of current density redistribution and spin accumulation effects.

Main Results:

  • Demonstration of a simple, silicon-compatible magnetic memory device fabricated with ferromagnetic nanoplatelets.
  • Observation of clear dual magnetization behavior with a threefold enhancement between the 'one' and 'zero' states.
  • Identification of large, avalanche-like noise attributed to spin accumulation and inter-nanoplatelet coupling effects.

Conclusions:

  • The developed magnetic memory device is silicon-compatible, easily fabricated, and scalable to single nanoparticle dimensions.
  • The chiral-induced spin selectivity effect enables dual magnetization behavior suitable for memory applications.
  • Further research into noise mechanisms can optimize the performance of these novel magnetic memory devices.