Micromagnetic study of CoPt–SiO2 granular films by spin-wave Brillouin scattering
Micromagnetic study of CoPt–SiO2 granular films by spin-wave Brillouin scattering
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自旋波布里渊散射 CoPt-SiO2 颗粒薄膜的微磁研究
DOI：
10.1063/1.372894
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发表时间：
2000
影响因子：
3.2
通讯作者：
C. Falco
中科院分区：
文献类型：
--
作者：
A. Kikitsu;A. Murayama;K. Hyomi;C. Falco
对CoPt-SiO2颗粒状磁记录介质的自旋波布里渊散射进行了研究。该薄膜在SiO2基体中含有铁磁性CoPt颗粒，由于磁性颗粒之间的交换耦合很小，具有极低的介质噪声特性。在具有不同微结构的颗粒状磁性薄膜中，发现了传播表面模式和驻波模式的自旋波。自旋波的一个可能的起源是有规则有序的CoPt颗粒之间的静磁耦合，正如人工图像化磁性薄膜所报道的那样。这一结果显示了CoPt-SiO2颗粒膜作为高密度记录介质的两个很有前景的特征：一是它是一种以自组织方式获得的有序介质，二是它不受热波动效应的影响，而热波动效应是当前高密度磁记录的一个严重问题。
A spin-wave Brillouin scattering study of a CoPt–SiO2 granular magnetic recording medium was made. This film contains ferromagnetic CoPt particles in a SiO2 matrix, and has an extremely low medium noise property due to little exchange coupling between magnetic grains. Spin waves of both the propagating surface mode and standing wave mode were found to be excited in granular magnetic films with various microstructures. A possible origin of the spin wave is a magnetostatic coupling between regularly ordered CoPt grains, as reported for artificially patterned magnetic thin films. This result shows two promising features of the CoPt–SiO2 granular film for high density recording medium: It is an ordered media obtained in a self-organizing manner, and it is less influenced by the thermal fluctuation effect, which is a serious problem for current high density magnetic recording.