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Related Concept Videos

Magnetic Force01:18

Magnetic Force

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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...
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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...
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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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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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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Updated: Jul 29, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optical forces in heat-assisted magnetic recording head-disk interface.

Roshan Mathew Tom1, Robert Smith2, Oscar Ruiz2

  • 1Department of Mechanical Engineering, UC Berkeley, Berkeley, CA, 94720, USA. roshantom@berkeley.edu.

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|May 25, 2023
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Summary
This summary is machine-generated.

Optical forces contribute to smear formation in Heat-Assisted Magnetic Recording (HAMR). Smear nanoparticle properties and interface conditions significantly influence these forces, impacting HAMR technology.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Heat-Assisted Magnetic Recording (HAMR) faces challenges with contaminant buildup, known as smear, on the near-field transducer.
  • Understanding smear formation is crucial for improving HAMR reliability and performance.

Purpose of the Study:

  • To investigate the role of optical forces, specifically those from electric field gradients, in the formation of smear in HAMR.
  • To compare optical forces with other forces like air drag and thermophoresis at the head-disk interface.

Main Methods:

  • Theoretical approximations were used to model and compare forces acting on smear nanoparticles.
  • Simulations were conducted to evaluate the force field's sensitivity to various parameters.
  • Analysis focused on two distinct smear nanoparticle shapes.

Main Results:

  • Optical forces originating from electric field gradients are a significant factor in smear formation.
  • Smear nanoparticle properties such as refractive index, shape, and volume critically affect optical force magnitude.
  • Interface conditions, including spacing and the presence of other contaminants, also influence the optical force.

Conclusions:

  • Optical forces play a key role in the accumulation of smear on HAMR near-field transducers.
  • Controlling nanoparticle properties and interface conditions can mitigate optical force-induced smear.
  • This research provides insights for designing more robust HAMR systems by addressing contaminant buildup.