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Related Concept Videos

Diamagnetism01:26

Diamagnetism

2.4K
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....
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
644
Paramagnetism01:30

Paramagnetism

2.5K
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...
2.5K
Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

644
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
644
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

281
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...
281

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Magnetization dynamics in quasiperiodic magnonic crystals.

Riya Mehta1, Bivas Rana2, Susmita Saha1

  • 1Department of Physics, Ashoka University, Sonipat, Haryana 131029, India.

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Quasiperiodic magnonic crystals offer enhanced control over spin waves due to their unique band structure. This tunability shows promise for advanced reprogrammable magnonic devices.

Keywords:
distorted artificial spin icemagnetic fractalmagnetization dynamicsmagnonic crystalmagnonicsquasiperiodic magnonic crystalsspin waves dynamics

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Periodic magnonic crystals have limitations in spin wave control.
  • Quasiperiodic structures offer unique spectral properties.
  • Understanding these properties is key for novel device applications.

Purpose of the Study:

  • To review magnetization reversal and dynamics in quasiperiodic magnonic crystals.
  • To highlight how quasiperiodicity tailors spin wave behavior.
  • To explore potential applications in reprogrammable devices.

Main Methods:

  • Overview of existing studies on quasiperiodic magnonic crystals.
  • Analysis of magnetization reversal processes.
  • Examination of precessional magnetization dynamics.

Main Results:

  • Quasiperiodic magnonic crystals exhibit complex, localized spin wave spectra.
  • Numerous band gaps and fractal features are observed.
  • Tailored band structures enable precise control over spin waves.

Conclusions:

  • Quasiperiodic magnonic crystals provide superior tunability compared to periodic ones.
  • Their unique properties are promising for reprogrammable magnonic devices.
  • Further research can unlock advanced applications in spintronics.