铁磁畴(Magnetic Domain)理论是用量子理论从微观上说明铁磁质的磁化机理。是指磁性材料内部的一个个小区域，每个区域内部包含大量原子，这些原子的磁矩都象一个个小磁铁那样整齐排列，但相邻的不同区域之间原子磁矩排列的方向不同。
结果表明：原子的非简谐振动会影响单畴铁磁粒子的自由能，但是不会影响弛豫时间。
Considering atomic anharmonic vibration, the authors have figured out the expression of free energy and relaxation of single-domain ferromagnetic granule in magnetic field.
这种氧化层使钢板产生应力场，阻碍磁畴壁的位移，因而使铁损增加。
The subsurface oxide layers generated stresses in the sheet and impeded domain wall motion, so that the iron loss was increased.
用瞬子方法研究了外加磁场对单畴双轴反铁磁颗粒宏观量子效应的影响。
The effect of the external magnetic field on macroscopic quantum tunneling in biaxial single domain antiferromagnetic particles is studied with the help of the instanton method.
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