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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...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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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 Force01:18

Magnetic Force

In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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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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Related Experiment Video

Updated: May 14, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Macroscopic magnetic frustration.

Paula Mellado1, Andres Concha, L Mahadevan

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces macroscopic ferromagnetic rotors that exhibit honeycomb spin ice rules, a phenomenon previously only seen at microscopic scales. This classical system offers new insights into geometrical frustration and emergent phenomena.

More Related Videos

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Related Experiment Videos

Last Updated: May 14, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Geometrical frustration is a key concept in condensed matter physics, typically studied at micro- and mesoscopic scales.
  • It explains phenomena in materials like spin ice, superconductors, and colloids.
  • Previous research has focused on microscopic manifestations of frustration.

Purpose of the Study:

  • To introduce a macroscopic system exhibiting geometrical frustration.
  • To demonstrate honeycomb spin ice rules in a classical, large-scale setting.
  • To explore the relaxation dynamics and underlying mechanics of macroscopic frustration.

Main Methods:

  • Utilizing a planar lattice of macroscopic ferromagnetic rotors with out-of-plane movement.
  • Observing the system's relaxation from a polarized initial state.
  • Developing a minimal classical mechanical model incorporating Coulombic interactions and viscous dissipation.

Main Results:

  • The macroscopic rotor system successfully exhibits honeycomb spin ice rules.
  • The system demonstrates relaxation on multiple time scales.
  • A classical mechanical model accurately explains the observed relaxation processes.

Conclusions:

  • Macroscopic geometrical frustration can arise in a purely classical mechanical system.
  • This system provides an experimentally accessible platform for studying frustration.
  • It reveals phenomena not observable in microscopic counterparts, bridging scales in physics.