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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
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...
Magnetic Damping01:17

Magnetic Damping

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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Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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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...
Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...

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Electrically driven magnetic relaxation in multiferroic LuFe2O4.

Fen Wang1, Chang-Hui Li, Tao Zou

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 17, 2011
PubMed
Summary

Researchers electrically controlled magnetization in multiferroic LuFe2O4 using current pulses. This method, driven by electric-field-induced charge order breakdown, offers a new way to manipulate magnetic properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Multiferroic materials exhibit coupled magnetic and electric properties.
  • Controlling magnetization electrically is crucial for advanced electronic devices.
  • Luthetium iron oxide (LuFe2O4) is a multiferroic material with potential applications.

Purpose of the Study:

  • To investigate the electrical control of magnetization in multiferroic LuFe2O4.
  • To understand the underlying mechanisms of current-induced magnetization changes.
  • To explore the potential of electrical manipulation for magnetic relaxation.

Main Methods:

  • Applying short electrical current pulses to multiferroic LuFe2O4 samples.
  • Measuring the induced magnetization changes as a function of pulse parameters (width, density).
  • Analyzing voltage variations to distinguish between electric-field effects and Joule heating.

Main Results:

  • Electrical control of magnetization was achieved using current pulses.
  • Magnetization change magnitude is dependent on pulse width and current density.
  • Evidence of electric-field-induced charge order breakdown, ruling out Joule heating as the primary mechanism.

Conclusions:

  • Current-driven magnetization change in LuFe2O4 is explained by a three-temperature model.
  • Delocalized electrons accelerate spin relaxation via strong spin-charge coupling.
  • Electrically assisted magnetic relaxation presents a novel approach for magnetization control.