| 1. | In an Ising ferromagnet below T _ c this does not happen.
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| 2. | Below this temperature the ferromagnet has a spontaneous magnetization.
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| 3. | The simplest way of understanding spin waves is to consider the Heisenberg ferromagnet:
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| 4. | The magnetization at any point in a ferromagnet can only change by rotation.
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| 5. | The added energy term implies a shift in the switching field of the ferromagnet.
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| 6. | The subscript F describes the properties of the ferromagnet and AF to the antiferromagnet.
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| 7. | Furthermore, the resonant absorption of microwave energy causes local heating of the ferromagnet.
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| 8. | Note that since this is spinning, this is not a non-moving ferromagnet.
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| 9. | Note that in the classical continuum case and in dimensions Heisenberg ferromagnet equation has the form
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| 10. | Where M is the magnetization of the ferromagnet and \ gamma is the gyromagnetic ratio.
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