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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Diamagnetism01:26

Diamagnetism

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.
Paramagnetism01:30

Paramagnetism

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...
Chirality02:25

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
MOS Capacitor01:25

MOS Capacitor

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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

A chiral-based magnetic memory device without a permanent magnet.

Oren Ben Dor1, Shira Yochelis, Shinto P Mathew

  • 1Department of Applied Physics, Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Nature Communications
|August 8, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel chiral-based magnetic memory device using spin-selective charge transfer. This technology offers a magnet-free, high-density, low-power alternative for universal memory applications.

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

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spintronics

Background:

  • Current computer memory technologies face limitations in density, speed, and power consumption.
  • Existing magnetic memory often relies on permanent magnets, adding complexity and cost.
  • Chiral molecules have shown potential as efficient spin filters in charge-transfer studies.

Purpose of the Study:

  • To demonstrate a proof-of-concept for a new type of chiral-based magnetic universal memory device.
  • To develop a Si-compatible memory solution that does not require a permanent magnet.
  • To leverage spin-selective charge transfer for magnetic data storage.

Main Methods:

  • Utilizing spin-selective charge transfer through a self-assembled monolayer of polyalanine.
  • Magnetizing a nickel (Ni) layer using the spin-filtering effect of chiral molecules.
  • Employing low currents for data readout.

Main Results:

  • Achieved magnetization in a Ni layer equivalent to a 0.4 T external magnetic field.
  • Demonstrated a functional proof-of-concept for a chiral-based magnetic memory device.
  • Readout achieved with low current requirements.

Conclusions:

  • The developed chiral-based technology offers a promising pathway for magnet-free universal memory.
  • This approach has the potential to overcome limitations of current magnetic memory technologies.
  • Enables the fabrication of inexpensive, high-density universal memory-on-chip devices.