| 21. | They are called ferroelectrics by analogy to ferromagnetic materials, which have spontaneous magnetization and exhibit similar hysteresis loops.
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| 22. | Ferromagnetic materials consist of magnetic domains.
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| 23. | A typical GMR device consists of at least two layers of ferromagnetic materials separated by a spacer layer.
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| 24. | This is what happens when a piece of ferromagnetic material is " magnetized " and becomes a permanent magnet.
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| 25. | Ferromagnetic materials with high coercivity are called magnetically " hard " materials, and are used to make permanent magnets.
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| 26. | The strength of this field can be greatly increased by placing a ferromagnetic material in the center of the coil.
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| 27. | With this first introduction of the metamaterial, it appears that the losses incurred were smaller than antiferromagnetic, or ferromagnetic materials.
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| 28. | Ferromagnetic materials can be divided into magnetically " soft " materials like microcrystalline structure, making them very hard to demagnetize.
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| 29. | The simplest method of generating a spin-polarised current in a metal is to pass the current through a ferromagnetic material.
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| 30. | When the ferromagnetic material is magnetized, it biases the amorphous metal strip into saturation, where it no longer produces harmonics.
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