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Magnetic Hysteresis (Hysteresis Loop
Structure (Hysteresis loops begins…
Magnetic Hysteresis
Hysteresis Loop
Structure
Hysteresis loops begins at H=0, where the magnetic dipole moments are disoriented and materials potrays paramagnetism
When H is presence, it follows pathway up to the saturation point (+Hs). Here, magnetic dipole moments are aligned in the directionof magnetization force and flux is zero
When H=0, some remnant magnetization remains, this point known as retentivity point (+Br)
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As the magnetizing force increases in the negative direction, the same saturation occur as before but in different direction (-Hs)
Loop continues with an equal but opposite retentivity point and coercivity point until reach original saturation point
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The curve does not ever go back to the origin. In order to make it happen, the material need to be demagnetized by hit it against a surface, reversing the direction of magnetizing field or heating pass the Neel temperature
Ferromagnetic material becomes paramagnetic due to thermal fluctuations in the magnetic dipole moments
that disoriented the spin
Introduction
Also known as hysteresis loop, representation of magnetizing force (H) vs magnetic flux density (B) of ferromagnetic material
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Without magnetic field, ferromagnetic exhibit paramagnetic behavior
Important in the memory capacity of devices for audio recording or magnetic storage of data on computer disk
To reduce the magnetic flux to zero, coercive force must be applied
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When ferromagnetic material introduced to magnetic field, the dipole moments align parallel and in same direction resulting stronger magnetic field
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