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Atomic Nuclei: Larmor Precession Frequency01:11

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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,...
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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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.
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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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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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Atomic Nuclei: Magnetic Resonance01:05

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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...
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Altermagnetic Spin Precession and Spin Transistor.

Li-Shuo Liu1, Kai Shao1,2, Hai-Dong Li1

  • 1Nanjing University, Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, School of Physics, and , Nanjing 210093, China.

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Summary
This summary is machine-generated.

Altermagnets exhibit unique spin precession, creating measurable voltage patterns. This discovery offers a new way to probe altermagnetic spin splitting and develop efficient spin transistors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Altermagnets are promising for spintronics, but their spin dynamics and transport are under-explored.
  • Understanding these properties is crucial for advancing spintronic device applications.

Purpose of the Study:

  • Investigate spin-resolved quantum transport in a d-wave altermagnet system.
  • Identify unique spin dynamics and transport signatures of altermagnets.
  • Explore potential spintronic device applications.

Main Methods:

  • Utilized a multiterminal quantum transport setup.
  • Analyzed spin-resolved transport in a d-wave altermagnet.
  • Investigated the effects of altermagnetic spin splitting on real-space spin patterns and Hall-like voltage.

Main Results:

  • Observed altermagnetic spin splitting inducing spin precession in real space, forming characteristic spin patterns.
  • Demonstrated that spatial modulation of transverse Hall-like voltage directly measures spin-splitting strength.
  • Showcased the robustness of these effects against dephasing and crystalline warping.

Conclusions:

  • Identified a fingerprint signature for altermagnets, enabling direct probing of spin-splitting.
  • Proposed a tunable altermagnet setup as a prototype for efficient spin transistors.
  • Bridged fundamental altermagnet physics with practical spintronic applications.