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Magnetic Susceptibility and Permeability01:31

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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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Magnetism01:30

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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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.
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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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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Biofunctionalization of Magnetic Nanomaterials
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Editorial for the Topic on Magnetic Materials and Devices.

Viktor Sverdlov1

  • 1Christian Doppler Laboratory for Nonvolatile Magnetoresistive Memory and Logic, Institute for Microelectronics, TU Wien, Gußhausstraße 27-29, A-1040 Wien, Austria.

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Summary
This summary is machine-generated.

Magnets possess inherent magnetic moments, enabling them to generate persistent magnetic fields. This fundamental property underpins various magnetic phenomena and technological applications.

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Area of Science:

  • Solid State Physics
  • Materials Science

Background:

  • Magnets exhibit persistent magnetic moments, creating intrinsic magnetic fields.
  • Understanding magnetic properties is crucial for developing advanced materials.

Discussion:

  • The study explores the fundamental characteristics of magnetic materials.
  • It delves into the physics behind persistent magnetic moments.

Key Insights:

  • Materials with persistent magnetic moments are defined as magnets.
  • These moments are responsible for generating magnetic fields.

Outlook:

  • Further research into magnetic materials could lead to innovations in data storage and energy.
  • Exploring novel magnetic phenomena remains a key area in physics.