Magnetic Anisotropy, Magnetostriction, and Magnetic Domain Walls in NiO. I. Theory
Magnetic Anisotropy, Magnetostriction, and Magnetic Domain Walls in NiO. I. Theory
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NiO 中的磁各向异性、磁致伸缩和磁畴壁。
DOI：
10.1143/jpsj.21.664
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发表时间：
1966
影响因子：
1.7
通讯作者：
Takemi Yamada
中科院分区：
文献类型：
--
作者：
Takemi Yamada
得到了磁对称D3 d晶体的磁各向异性能和磁弹性能的一般表达式。结果表明，当NiO的易磁化面为（111）面时，其易磁化方向为turnright.eps [1\bar10]或非常接近于turnright.eps [11\bar2]的方向，在这两种易磁化方向下，其自发磁致伸缩均由正交形变和单斜形变两个应变分量组成.计算了考虑四种原子起源的磁弹性能。从这些来源的能量的贡献被证明是几乎相同的幅度，和磁致伸缩应变在NiO的估计是从计算的能量值和MgO的弹性常数的顺序为10 - 4。根据磁致伸缩应变的对称性，预测了这种晶体中磁畴壁（S壁）的可能方向。
A general expression of the magnetic anisotropy energy and the magnetoelastic energy in the crystal of magnetic symmetry D 3 d is obtained. It is shown that, in NiO, the easy directions of magnetization will be either turnrightup.eps[1\bar10] or directions very close to turnrightup.eps[11\bar2] when the easy plane is (111), and that, in either case of easy directions, the spontaneous magnetostriction should consist of two strain components representing an orthorhombic deformation and a monoclinic deformation. The magnetoelastic energy is calculated taking four kinds of atomistic origin into account. Contributions from these origins to the energy are shown to be nearly of the same magnitude, and the magnetostrictive strain in NiO is estimated to be of the order of 10 -4 from the calculated energy values and the elastic constants of MgO. Possible directions of magnetic domain walls (S-walls) in such a crystal are predicted from the symmetry of the magnetostrictive strain.