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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

365
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...
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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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Diamagnetism01:26

Diamagnetism

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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.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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.
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Inherent Spin-Polarization Coupling in a Magnetoelectric Vortex.

Sujit Das1, Valentyn Laguta2, Katherine Inzani3,4,5

  • 1Material Research Centre, Indian Institute of Science, Bangalore 560012, India.

Nano Letters
|May 13, 2022
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Researchers demonstrate electric field control of spin direction in ferroelectric materials using Fe3+-doped superlattices. This breakthrough offers potential for novel spintronics and quantum information devices.

Keywords:
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Area of Science:

  • Solid-state physics and materials science
  • Spintronics and quantum information science
  • Ferroelectric materials research

Background:

  • Solid-state materials are key for manipulating spins in spintronics and quantum information science.
  • Ferroelectric materials offer an alternative approach using electric fields to control quantum phenomena.
  • Dilute Fe3+-doped ferroelectric PbTiO3-SrTiO3 superlattices serve as a model system for investigation.

Purpose of the Study:

  • To demonstrate intrinsic spin-polarization control of spin directionality in ferroelectric vortices and skyrmions.
  • To investigate the coupling between Fe3+ ion spins and local polarization in ferroelectric superlattices.
  • To explore the potential for electric field manipulation of spin direction in quantum devices.

Main Methods:

  • Utilized dilute Fe3+-doped ferroelectric PbTiO3-SrTiO3 superlattices as a model system.
  • Employed electron paramagnetic resonance (EPR) spectroscopy to analyze spin behavior.
  • Performed first-principles calculations to corroborate experimental findings on spin-polarization effects.

Main Results:

  • Demonstrated intrinsic spin-polarization control of spin directionality in ferroelectric vortices and skyrmions.
  • EPR spectra revealed strong coupling between Fe3+ ion spins and local polarization.
  • Spins were preferentially aligned perpendicular to the ferroelectric polar c axis in the vortex structure.

Conclusions:

  • The study confirms the variation of spin directionality with polar texture in ferroelectric systems.
  • This research highlights the potential for electric field control of spin direction in complex ferroelectric materials.
  • Findings pave the way for future quantum analogues of macroscopic magnetoelectric devices.