Investigation of 90° coupling in Fe/Ag/Fe structures: ‘‘Loose spins’’ and fluctuation mechanism
Investigation of 90° coupling in Fe/Ag/Fe structures: ‘‘Loose spins’’ and fluctuation mechanism
复制标题
Fe/Ag/Fe 结构中 90° 耦合的研究：“松散自旋”和涨落机制
DOI：
10.1063/1.359117
复制
发表时间：
1995
影响因子：
3.2
通讯作者：
W. Zinn
中科院分区：
文献类型：
--
作者：
M. Schäfer;S. Demokritov;S. Müller;R. Schäfer;M. Schneider;P. Grünberg;W. Zinn
结果概述了有关 Sloczewski 解释 90° 耦合的理论的实验工作：“松散自旋”理论和厚度涨落机制。松散自旋理论表明，90°耦合源于交换耦合层状结构层间的顺磁杂质。使用楔形技术研究了这些顺磁杂质对磁交换耦合的影响。在超高真空中制备了高质量的单晶 Fe/Ag/Fe 样品，每个样品由两个楔形物组成：一个楔形物在生长过程中故意插入额外的铁到银夹层中，另一个楔形物具有纯 Fe/Ag/Fe 结构。磁光磁滞回线的详细分析定量地揭示了双线性和 90° 耦合强度。正如松散自旋理论所预测的，Ag 间隔物中额外的 Fe 会导致 90° 耦合的强烈温度依赖性。根据该理论，90°耦合强度的增加与杂质浓度成正比...
Results are outlined of experimental work concerning Slonczewski’s theories explaining 90° coupling: ‘‘loose spin’’ theory and thickness‐fluctuation mechanism. The loose spin theory suggests that 90° coupling originates from paramagnetic impurities in the interlayer of an exchange‐coupled layered structure. The influence of these paramagnetic impurities on the magnetic exchange coupling was studied using the wedge technique. High‐quality single‐crystalline Fe/Ag/Fe samples were prepared in UHV and each sample consisted of two wedges: one wedge with additional Fe deliberately inserted during growth into the Ag interlayer and one wedge with a pure Fe/Ag/Fe structure. The detailed analysis of magneto‐optic hysteresis loops revealed quantitatively the bilinearly and the 90° coupling strength. As predicted by loose spin theory additional Fe in the Ag spacer lead to a strong temperature dependence of the 90° coupling. According to the theory an increase of 90° coupling strength proportional to impurity concentr...