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Related Concept Videos

Magnetic Field Due To A Thin Straight Wire01:27

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.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Magnetic Field due to Moving Charges01:23

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...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:

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Related Experiment Video

Updated: Jun 14, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin-wave interference in three-dimensional rolled-up ferromagnetic microtubes.

Felix Balhorn1, Sebastian Mansfeld, Andreas Krohn

  • 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany.

Physical Review Letters
|April 7, 2010
PubMed
Summary

We studied spin waves in tiny rolled-up Permalloy tubes. These tubes act as resonators, showing quantized modes tunable by their size and structure.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Spin waves are fundamental excitations in magnetic materials.
  • Rolled-up microtubes offer unique geometries for exploring wave phenomena.
  • Understanding spin-wave behavior in confined geometries is crucial for spintronics.

Purpose of the Study:

  • To investigate spin-wave excitations in rolled-up Permalloy microtubes.
  • To identify the nature of observed spin-wave modes.
  • To explore the tunability of spin-wave properties in these microtubes.

Main Methods:

  • Microwave absorption spectroscopy was employed to probe spin-wave dynamics.
  • Experimental data was analyzed to identify quantized azimuthal modes.
  • The influence of geometric parameters (radius, layers) was studied.

Main Results:

  • Quantized azimuthal spin-wave modes were observed in the microtubes.
  • These modes result from the constructive interference of Damon-Eshbach spin waves.
  • The microtubes function as efficient spin-wave resonators.
  • The mode spectrum is controllable via the tube's radius and number of layers.

Conclusions:

  • Rolled-up Permalloy microtubes exhibit resonant spin-wave behavior.
  • The observed modes are a direct consequence of wave interference around the tube circumference.
  • Geometric tailoring offers a pathway to control spin-wave properties for potential applications.