Antiferromagnetic coupling in fcc Fe overlayers on Ni/Cu(100)
Antiferromagnetic coupling in fcc Fe overlayers on Ni/Cu(100)
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Ni/Cu(100) 上面心立方 Fe 覆盖层中的反铁磁耦合
DOI：
10.1103/physrevb.60.12945
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发表时间：
1999
影响因子：
3.7
通讯作者：
M. Wuttig
中科院分区：
文献类型：
--
作者：
B. Schirmer;M. Wuttig
Ni/Cu ~ 100！已经决定研究磁界面的影响。磁光克尔椭圆偏振仪区分不同的磁性行为的三个区域，与以前的研究Fe/Co/Cu ~ 100！Fe/Ni/Cu ~ 100！.这些磁状态与薄膜结构密切相关。10个单层以上~ ML！铁膜被均匀磁化并采用bcc相。高达2.5 ML的非常薄的薄膜也是均匀磁化的，但结合（4 3 1）重建显示出fcc结构。最复杂的磁性特征是5到10 ML之间的Fe膜。在这个厚度范围内，铁膜不是均匀磁化的。相反，铁磁性仅在Fe膜表面和Fe/Ni膜界面处观察到。表面磁化强度明显与表面原子体积增大和（2 - 3 - 1）表面重构有关。此外，磁性Ni衬底在Fe/Ni界面处的Fe膜中诱导铁磁有序。薄膜的两个铁磁部分的耦合显示出强烈的温度依赖性。这归因于双线性和双二次交换耦合的温度依赖性。在低温下，观察到两个铁磁部分之间的反铁磁耦合。随着温度的升高，随后是倾斜的自旋排列，最后是铁磁耦合。@S0163 -1829 ~ 99！07041-1 #
Magnetic properties of ultrathin fcc Fe overlayers on Ni/Cu ~ 100 ! have been determined to study the influence of a magnetic interface. Three regions of different magnetic behavior are distinguished by magneto-optic Kerr ellipsometry, in line with previous studies of Fe/Co/Cu ~ 100 ! and Fe/Ni/Cu ~ 100 ! . These magnetic states are closely related to the film structure. Above 10 monolayers ~ ML ! , the iron films are homogeneously magnetized and adopt the bcc phase. Very thin films up to 2.5 ML are homogeneously magnetized as well but show an fcc structure in conjunction with a (4 3 1) reconstruction. The most complex magnetic properties characterize Fe films between 5 and 10 ML. In this thickness range the iron films are not homogeneously magnetized. Instead ferromagnetism is only observed at the Fe film surface and the Fe/Ni film interface. The surface magnetization is apparently correlated with an enlarged atomic volume at the surface and a (2 3 1) surface reconstruction. Additionally, the magnetic Ni substrate induces ferromagnetic order in the Fe film at the Fe/Ni interface. The coupling of the two ferromagnetic portions of the film shows a strong temperature dependence. This is attributed to the temperature dependence of the bilinear and biquadratic exchange coupling. At low temperature an antiferromagnetic coupling between the two ferromagnetic portions is observed. With increasing temperature this is followed by a canted spin arrangement and finally a ferromagnetic coupling. @ S0163-1829 ~ 99 ! 07041-1 #