Numerical study of magnetoresistance for currents perpendicular to planes in spring ferromagnets
Numerical study of magnetoresistance for currents perpendicular to planes in spring ferromagnets
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弹簧铁磁体中垂直于平面的电流磁阻的数值研究
DOI：
10.1103/physrevb.68.094418
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发表时间：
2003
影响因子：
3.7
通讯作者：
K. Takanashi
中科院分区：
文献类型：
--
作者：
J. Inoue;H. Itoh;S. Mitani;K. Takanashi
本文计算了由外磁场形成人工畴壁的弹簧铁磁体在弹道极限内垂直于平面电流的磁电阻。我们考虑了对磁流变的两种贡献：一种是由磁化的扭曲引起的，另一种是由于构成弹簧铁磁体的两个铁磁体之间的电子结构不匹配引起的。我们表明，所得MR可能显示出非单调依赖于畴壁的宽度，并且根据这两个贡献的大小可以是正的或负的。我们进一步证明，当软铁磁体夹在硬铁磁体之间时，磁流变体中出现振荡行为。
Magnetoresistance (MR) for currents perpendicular to planes is calculated within the ballistic limit for spring ferromagnets in which an artificial domain wall is formed by the external magnetic fields. We consider two contributions to the MR: one is caused by a twisting of the magnetization and the other is due to a mismatch of the electronic structure between the two ferromagnets comprising the spring ferromagnets. We show that the resulting MR may show a nonmonotonic dependence on the width of the domain walls and can be either positive or negative according to the magnitude of these two contributions. We further show that oscillatory behavior appears in the MR when the soft ferromagnet is sandwiched between hard ferromagnets.