INTER-GRAIN EXCHANGE INTERACTION FOR SINGLE-PHASE NANOCRYSTALLINE Nd-Fe-B MAGNETS

• 来源期刊: 中国物理(英文版)
• 学科: 物理学
• 关键词: hysteresis loop high coercivity materials rare earth permanent magnet exchange inter action micromagnetics
• 年，卷（期）: 2001,（6）
• 页码范围: 555-557
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

The demagnetization curve as a function of intensity of the inter-grain exchange interaction was calculated for single-phase nanocrystalline Nd-Fe-B magnets by use of the finite-element technique of micromagnetics. Also,the strength of the exchange interaction was estimated as a function of the Nd content x for the nanocrystalline NdxFe94-xB6 magnets by comparing the above result with the experimental relation between iHc and x for the magnets. We found that the inter-grain exchange interaction decreases with the increase of x, are≈70% and≈60% of the inter-grain exchange interaction for x＝15.5(p0 iHc ≈2.0T) and x＝19(p0 iHc ≈2.3T), respectively.