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Related Concept Videos

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...
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...
Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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.
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...
Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...

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Fast domain wall motion in magnetic comb structures.

E R Lewis, D Petit, L O'Brien

    Nature Materials
    |October 5, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Engineered traps experimentally boosted domain wall velocity fourfold by preventing structural changes. This breakthrough enhances domain wall devices for memory, logic, and sensing applications.

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    Area of Science:

    • Physics and Materials Science: Focuses on the behavior of magnetic domain walls in submicron ferromagnetic structures.

    Background:

    • Submicron ferromagnetic strips allow isolation of single domain walls, but their dynamics are complex.
    • Domain wall velocity saturates and breaks down above a critical field, hindering device performance.
    • Existing suppression methods for breakdown are largely theoretical, lacking experimental validation.

    Discussion:

    • This study experimentally demonstrates the effectiveness of cross-shaped traps in controlling domain wall dynamics.
    • Traps prevent domain wall structural transformations, a key factor in breakdown.
    • Observed a fourfold increase in maximum domain wall velocity compared to plain strips.

    Key Insights:

    • Cross-shaped traps are a viable method to enhance domain wall velocity.
    • Preventing domain wall structural transformations is crucial for high-speed operation.
    • Experimental validation of suppression techniques opens new avenues for device design.

    Outlook:

    • This research paves the way for faster and more reliable domain wall-based devices.
    • Potential applications include high-density memory, advanced logic circuits, and sensitive magnetic sensors.
    • Further research could explore optimized trap geometries and materials for even greater performance gains.