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Related Concept Videos

Magnetic Field due to Moving Charges01:25

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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Non-ohmic Devices00:51

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A diode...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Giant current-driven domain wall mobility in (Ga,Mn)As.

Anh Kiet Nguyen1, Hans Joakim Skadsem, Arne Brataas

  • 1Department of Physics, Norwegian University of Science and Technology, N-7491, Trondheim, Norway.

Physical Review Letters
|May 16, 2007
PubMed
Summary

Spin-orbit coupling in (Ga,Mn)As dramatically boosts domain wall mobility. This phenomenon, driven by hole current, leads to significant spin accumulation and enhanced torque, aligning with experimental results.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Investigating domain wall dynamics is crucial for developing advanced spintronic devices.
  • Understanding the influence of charge carriers on magnetic domain walls is an active research area.

Purpose of the Study:

  • To theoretically investigate the impact of spin-orbit coupling on hole current-driven domain wall dynamics in gallium manganese arsenide ((Ga,Mn)As).
  • To elucidate the mechanisms behind enhanced domain wall mobility observed in experiments.

Main Methods:

  • Theoretical study of hole current-driven domain wall dynamics.
  • Analysis of spin-orbit coupling effects on hole reflection and spin accumulation at domain walls.
  • Calculation of spin-transfer torque and domain wall mobility.

Main Results:

  • Spin-orbit coupling induces significant hole reflection at the domain wall, even in the adiabatic limit.
  • This reflection leads to spin accumulation and mistracking between current-carrying spins and domain wall magnetization.
  • The effect increases out-of-plane nonadiabatic spin-transfer torque, enhancing current-driven domain wall mobility by 3-4 orders of magnitude.

Conclusions:

  • The theoretical model successfully explains the experimentally observed trends and magnitudes of domain wall current mobilities.
  • Spin-orbit coupling is a key factor in achieving high domain wall mobility in (Ga,Mn)As.
  • Findings provide insights for designing efficient spintronic devices based on magnetic domain wall motion.