EFFECT OF α-Fe SURFACE LAYER ON THE MAGNETIC REVERSION PROCESS FOR Nd2Fe14B CRYSTAL

• 来源期刊: 中国物理（英文版）
• 关键词: hysteresis loop permanent magnet micromagnetics
• 年，卷（期）: 2001,（12）
• 页码范围: 1157-1162
• 页数: 6页
• 语种: 英文

摘要

The demagnetization process for a Nd2Fe14B grain covered by an α-Fe layer was studied by use of the finite element technique of micromagnetics, μ0 iHc decreases with the increase of α-Fe layer thickness t. With the increase of t from 0 to 6nm, po iHc decreases from ～7 T to ～3.5 T when the angle between the applied field and the c-axis of the Nd2Fe14B grain is 0.5° and from ～4 T to ～1.5 T when the angle is 30° or 60°. The effect is only slightly affected by the angle between the α-Fe layer and the field direction.