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Magnetism01:30

Magnetism

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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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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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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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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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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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Rewritable artificial magnetic charge ice.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Artificial ices are valuable for studying geometrical frustration.
  • Achieving tailored long-range ordering in artificial ice configurations has been a significant challenge.
  • This limitation hinders fundamental understanding and practical applications.

Purpose of the Study:

  • To design an artificial spin structure for magnetic charge ice with tunable long-range ordering.
  • To develop a technique for precise manipulation of local magnetic charge states.
  • To demonstrate write-read-erase multifunctionality at room temperature.

Main Methods:

  • Design of a novel artificial spin structure.
  • Development of a technique for local magnetic charge state manipulation.
  • Experimental demonstration of room-temperature write-read-erase functionality.

Main Results:

  • Achieved tunable long-range ordering of eight different configurations in magnetic charge ice.
  • Demonstrated precise local manipulation of magnetic charge states.
  • Confirmed write-read-erase multifunctionality at room temperature.

Conclusions:

  • The developed magnetic charge ice offers global reconfigurability and local writability.
  • This system is a promising platform for designing magnetic monopole defects.
  • Potential applications include tailoring magnonics and controlling properties of 2D materials.