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Related Concept Videos

Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Magnetic Damping01:17

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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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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Magnetic Declination01:19

Magnetic Declination

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Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
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Magnetic Force01:18

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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.
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Compass01:23

Compass

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The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
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Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution
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Active magnetoplasmonic ruler.

Irina Zubritskaya1, Kristof Lodewijks1, Nicolò Maccaferri2

  • 1†Department of Applied Physics, Chalmers University of Technology, Göteborg 41296, Sweden.

Nano Letters
|April 28, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnetoplasmonic nanoantenna for precise nanoscale measurements. This plasmon ruler offers significantly enhanced precision for distance and force sensing applications.

Keywords:
cobaltdimerlocalized surface plasmon resonancemagneto-optical Kerr effect (MOKE)magnetoplasmonicsnickelplasmon ruler

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Area of Science:

  • Nanophotonics and Plasmonics
  • Nanoscale Metrology
  • Magnetism and Nanomaterials

Background:

  • Plasmon rulers utilize near-field coupling for nanoscale structural information.
  • Current plasmon rulers have limitations in precision and range.
  • Integrating magnetism offers new possibilities for active control and enhanced sensing.

Purpose of the Study:

  • To conceptualize a magnetoplasmonic dimer nanoantenna for nanoscale distance reporting.
  • To develop an active plasmon ruler with dynamically optimized optical response.
  • To propose a method for optically measuring nanoscale force responses using magnetic fields.

Main Methods:

  • Combining nanoplasmonics and nanomagnetism principles.
  • Designing a magnetoplasmonic dimer nanoantenna configuration.
  • Simulating and analyzing optical response to varying distances and applied forces.

Main Results:

  • The proposed magnetoplasmonic ruler achieves nanoscale distance measurements with approximately two orders of magnitude higher precision than existing methods.
  • The nanoantenna's spatial orientation can be optimized for enhanced measurement accuracy.
  • A concept for optically measuring nanoscale force responses via magnetic fields is demonstrated.

Conclusions:

  • Magnetoplasmonic dimer nanoantennas represent a significant advancement in nanoscale metrology.
  • This active plasmon ruler design enables unprecedented precision in measuring nanoscale distances and forces.
  • The findings open new avenues for high-precision sensing in various scientific and technological fields.