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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.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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 Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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...

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Magnetic materials for optical recording.

D Chen

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This review covers recent advancements in optical digital data storage utilizing magnetic materials. This technology merges magnetic recording with beam addressable techniques for improved data storage solutions.

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    Area of Science:

    • Materials Science
    • Data Storage Technology
    • Optoelectronics

    Background:

    • Magnetic materials offer high data density and stability.
    • Optical techniques provide high-speed, non-contact data access.
    • Combining these offers unique advantages for digital storage.

    Purpose of the Study:

    • To review recent progress in optical digital data storage using magnetic materials.
    • To highlight the synergistic benefits of magnetic recording and beam addressable techniques.

    Main Methods:

    • Literature review of recent research and technological developments.
    • Analysis of the integration of optical and magnetic storage principles.

    Main Results:

    • Demonstration of combined magnetic and optical properties for data storage.
    • Advancements in beam addressable magnetic storage systems.
    • Progress in materials and read/write mechanisms.

    Conclusions:

    • Optical digital data storage with magnetic materials is a promising technology.
    • Continued research is expected to yield further improvements in performance and capacity.