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Related Concept Videos

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...
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...
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...
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.
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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...
Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...

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Related Experiment Video

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

Giant molecular magnetocapacitance.

Yu-Ning Wu1, X-G Zhang, Hai-Ping Cheng

  • 1Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA.

Physical Review Letters
|June 11, 2013
PubMed
Summary
This summary is machine-generated.

We introduce molecular magnetocapacitance (MC), a new property in nanoscale systems. This effect, observed in spin-transitioning molecules and quantum dots, shows potential for novel electronic device applications.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum chemistry

Background:

  • Investigating spin-dependent charging energy in nanoscale systems is crucial for advancing quantum technologies.
  • Understanding quantum capacitance's sensitivity to spin and charge states is key for novel device functionalities.

Purpose of the Study:

  • To introduce and define intrinsic molecular magnetocapacitance (MC).
  • To explore the potential of MC in nanoscale systems, including single molecule junctions and quantum dots.
  • To analyze the feasibility of experimental probing of molecular MC.

Main Methods:

  • First-principles calculations were employed to investigate nanoscale systems.
  • Analysis focused on spin-dependent charging energy and quantum capacitance.
  • Coulomb blockade effect in single molecule junctions was studied under varying bias voltage and magnetic fields.

Main Results:

  • A new concept of intrinsic molecular magnetocapacitance (MC) was introduced.
  • MC values as high as 12% were predicted in molecules and quantum dots with spin state transitions.
  • A specific molecular nanomagnet demonstrated 6% MC, enhanced to 9.6% when placed above a dielectric surface.
  • Quantum capacitance was found to be highly sensitive to system spin and charge states.

Conclusions:

  • Molecular magnetocapacitance is a promising property for nanoscale electronic applications.
  • The Coulomb blockade effect in single molecule junctions can be exploited to control electron conductance using MC.
  • The predicted molecular MC effect is experimentally accessible under current technological conditions.