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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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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.
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Paramagnetism01:30

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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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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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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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.
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Observation of temperature-gradient-induced magnetization.

Dazhi Hou1,2, Zhiyong Qiu1,2, R Iguchi3

  • 1WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.

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|July 27, 2016
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Researchers magnetized gold using temperature gradients or magnetic resonance, proving time-reversal symmetry breakdown. This discovery offers new insights into spin caloritronics and magnetic material interactions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Traditional magnetization methods using magnetic fields are difficult to focus.
  • Existing electric field-based magnetization techniques are limited to specialized materials.

Purpose of the Study:

  • To demonstrate a novel method for magnetizing simple metals like gold.
  • To investigate the breakdown of time-reversal symmetry in such systems.

Main Methods:

  • Utilizing temperature gradients or magnetic resonance in gold samples in contact with magnetic insulators.
  • Observing an anomalous Hall-like effect to detect induced magnetization.

Main Results:

  • Successfully magnetized gold, a non-magnetic material, using thermal or magnetic resonance methods.
  • Directly observed the breakdown of time-reversal symmetry through Hall measurements.
  • Gained experimental access to the spectral spin Hall conductance of gold.

Conclusions:

  • A simple and effective method for magnetizing non-magnetic metals has been established.
  • The findings provide a foundation for understanding spin caloritronics phenomena.
  • This work serves as a crucial reference for theoretical calculations in related fields.