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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...
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...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...

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Scanning SQUID Study of Vortex Manipulation by Local Contact
06:53

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Quantum manipulation via atomic-scale magnetoelectric effects.

Anh T Ngo1, Javier Rodriguez-Laguna, Sergio E Ulloa

  • 1Department of Physics and Astronomy and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, USA. tanhngo@gmail.com

Nano Letters
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Magnetoelectric effects at the atomic scale offer unique control over quantum systems. These effects enable precise manipulation of electronic properties within atomic-scale structures like quantum corrals.

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Area of Science:

  • Condensed Matter Physics
  • Atomic Scale Phenomena
  • Quantum Mechanics

Background:

  • Magnetoelectric effects are crucial for novel electronic functionalities.
  • Atomic-scale control is key to advancing quantum technologies.
  • Spin-orbit coupling plays a significant role in quantum systems.

Purpose of the Study:

  • To demonstrate magnetoelectric effects at the atomic scale.
  • To explore their application in controlling quantum corrals.
  • To investigate their utility in probing electronic properties.

Main Methods:

  • Fabrication of a quantum corral using a wall of magnetic atoms on a metal surface.
  • Observation of spin-orbit coupling within the corral.
  • Utilizing magnetoelectric effects to influence system properties.

Main Results:

  • Magnetoelectric effects were successfully demonstrated at the atomic scale.
  • Control over the properties and electronic signatures of systems inside the quantum corral was achieved.
  • Spin-orbit coupling was confirmed to be observable within the defined structure.

Conclusions:

  • Magnetoelectric effects provide unique functionality at the atomic scale.
  • These effects offer powerful, alternative methods for probing atomic-scale electronic properties.
  • Quantum corrals defined by magnetic atoms are viable platforms for observing and utilizing these phenomena.