Stoner excitations
المؤلف:
J. M. D. COEY
المصدر:
Magnetism and Magnetic Materials
الجزء والصفحة:
166
16-2-2021
1373
Stoner excitations
Besides spin waves, another type of excitation in a metal can reduce its magnetization. Electrons at the Fermi level can be excited from filled states in the majority-spin band to empty states in the minority-spin band. If the initial state has wavevector k and the final state has wavevector k − q, an excitation of wavevector q is produced. The energy of the excitation is given by
At q = 0, these excitations require the full exchange splitting Δex , but at finite q there is a broad continuum of Stoner excitations.
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