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Date: 23-2-2021
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Date: 21-2-2021
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Date: 24-12-2020
1061
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Ferromagnetic phenomena
Magnetic order in a crystal can influence the lattice parameters and the elastic moduli. These effects reflect the volume or strain dependence of bandwidth, exchange energy, magnetic dipole energy or crystal-field interaction. Some effects, like linear magnetostriction, are small, λs ≈ 10−5. Others like the ΔE effect, the change of Young’s modulus associated with domain alignment, can be as large as 90%. Even very small magnetoelastic effects may be critical when optimizing the properties of soft magnets, because of the sensitivity of coercivity to stress-induced anisotropy. Ferromagnetism also influences the thermal, electrical and optical properties of solids. These intrinsic effects in ferromagnets are discussed in the following paragraphs.
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"عادة ليلية" قد تكون المفتاح للوقاية من الخرف
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ممتص الصدمات: طريقة عمله وأهميته وأبرز علامات تلفه
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المجمع العلمي للقرآن الكريم يقيم جلسة حوارية لطلبة جامعة الكوفة
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