Hydrogen-controlled interlayer exchange coupling in Fe/LaHx multilayers
Hydrogen-controlled interlayer exchange coupling in Fe/LaHx multilayers
复制标题
Fe/LaHx 多层膜中氢控制的层间交换耦合
DOI：
10.1016/s0304-8853(01)00491-7
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发表时间：
2001
影响因子：
2.7
通讯作者：
H. Maletta
中科院分区：
文献类型：
--
作者：
W. Lohstroh;F. Leuenberger;W. Felsch;H. Fritzsche;H. Maletta
磁光Kerr磁测量和中子反射测量表明，Fe层通过LaHx间隔层表现出磁交换耦合。在这些材料的多层膜上观察到铁磁和反铁磁耦合，这取决于氢化物层的厚度，但没有振荡行为。从金属二氢化镧隔离层出发，考察了溶解更多氢气的效果。耦合的符号和大小主要取决于氢含量x。耦合可以从反铁磁到铁磁反转，反之亦然。这些变化是由于氢化物的电子结构的改变造成的。当吸氢饱和时，氢化物层变得绝缘，交换耦合可能消失。在这种最终状态下，多层膜的特性总是表现为一条非常软的铁磁性矩形磁滞曲线。一旦氢被去除到初始浓度，就恢复了原来的磁结构。
Magneto-optic Kerr magnetometry and neutron reflectometry reveal that Fe layers exhibit magnetic exchange coupling through LaHxspacer layers. Ferromagnetic and antiferromagnetic coupling is observed on multilayers of these materials depending on the thickness of the hydride layers, but without oscillatory behavior. Starting from metallic La dihydride spacer layers the effect of dissolving increasingly more hydrogen was examined. Sign and value of the coupling depend crucially on the hydrogen content x. The coupling can be inverted from antiferromagnetic to ferromagnetic and vice versa. These alterations are due to modifications of the electronic structure of the hydride. When the hydrogen absorption saturates the hydride layers become insulating and the exchange coupling is likely to disappear. In this final state the multilayers are always characterized by a very soft ferromagnetic rectangular hysteresis curve. Upon removal of the hydrogen to the initial concentration the original magnetic structure is restored.