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Date: 14-2-2021
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Date: 4-3-2021
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Date: 3-3-2021
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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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دخلت غرفة فنسيت ماذا تريد من داخلها.. خبير يفسر الحالة
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ثورة طبية.. ابتكار أصغر جهاز لتنظيم ضربات القلب في العالم
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العتبة العباسية المقدسة تقيم مجلسًا عزائيًّا لإحياء ذكرى هدم قبور أئمة البقيع (عليهم السلام)
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