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The demagnetizing field, also called the stray field (outside the magnet), is the magnetic field (H-field) [1] generated by the magnetization in a magnet.The total magnetic field in a region containing magnets is the sum of the demagnetizing fields of the magnets and the magnetic field due to any free currents or displacement currents.
USS Jimmy Carter in the magnetic silencing facility at Naval Base Kitsap for her first deperming treatment RMS Queen Mary arriving in New York Harbor, 20 June 1945, with thousands of U.S. soldiers – note the prominent degaussing coil running around the hull Control panel of the MES-device ("Magnetischer Eigenschutz" German: magnetic self-protection) in a German submarine Close-wrap deperming ...
Ferrofluid on glass, with a rare-earth magnet underneath. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements.Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.
Coercivity in a ferromagnetic material is the intensity of the applied magnetic field (H field) required to demagnetize that material, after the magnetization of the sample has been driven to saturation by a strong field. This demagnetizing field is applied opposite to the original saturating field.
Heated to temperatures above T C, ferromagnetic materials become paramagnetic and their magnetic behavior is dominated by spin waves or magnons, which are boson collective excitations with energies in the meV range.
When you swipe or insert your credit card into a card reader, the card reader receives information like your account number and credit limit. If the magnetic strip on your card is damaged, the ...
Ferrimagnets have a critical temperature above which they become paramagnetic just as ferromagnets do. [6] At this temperature (called the Curie temperature) there is a second-order phase transition, [7] and the system can no longer maintain a spontaneous magnetization. This is because at higher temperatures the thermal motion is strong enough ...
The contributions of the different internal energy factors described above is expressed by the free energy equation proposed by Lev Landau and Evgeny Lifshitz in 1935, [7] which forms the basis of the modern theory of magnetic domains. The domain structure of a material is the one which minimizes the Gibbs free energy of the material.