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Related Concept Videos

Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Motion Of A Charged Particle In A Magnetic Field01:22

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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Scanning SQUID Study of Vortex Manipulation by Local Contact
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Low-frequency spin dynamics in a canted antiferromagnet.

Norio Kumada1, Koji Muraki, Yoshiro Hirayama

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan. kumada@will.brl.ntt.co.jp

Science (New York, N.Y.)
|July 22, 2006
PubMed
Summary

Strong electron-spin fluctuations were observed in two-dimensional electron systems within the quantum Hall regime. These fluctuations indicate a gapless spin excitation mode and canted antiferromagnetic order, persisting even at low temperatures.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Hall Effect Physics

Background:

  • Two-dimensional electron systems (2DES) are crucial for understanding quantum phenomena.
  • The quantum Hall regime exhibits unique electronic properties influenced by magnetic fields.
  • Nuclear spin relaxation is a sensitive probe of electron spin dynamics.

Purpose of the Study:

  • To investigate electron-spin fluctuations in 2DES within the quantum Hall regime.
  • To explore the behavior of these fluctuations at low temperatures.
  • To identify the underlying magnetic order responsible for the observed spin dynamics.

Main Methods:

  • Resistively detected nuclear spin relaxation measurements were employed.
  • Experiments were conducted on closely separated two-dimensional electron systems.
  • Measurements were performed down to a temperature of 66 millikelvin.

Main Results:

  • Strong low-frequency electron-spin fluctuations were detected.
  • A sharp enhancement of the nuclear spin-lattice relaxation rate (1/T1) was observed as temperature decreased.
  • The relaxation rate 1/T1 showed divergent behavior, signaling a gapless spin excitation mode.
  • Evidence for canted antiferromagnetic order was identified.

Conclusions:

  • The study demonstrates a two-dimensional system with planar broken symmetry.
  • Electron-spin fluctuations do not freeze out at low temperatures in this system.
  • The findings are characteristic of canted antiferromagnetic order in 2DES.