【作者】 乐陶然；

【导师】 杨晓非；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2007， 硕士

【摘要】 光磁混合记录方法,是一种可以突破超顺磁极限的限制,并进一步提高硬盘记录密度和读写速率的一种新型超高密度信息存储方式。它汲取了磁光记录以及磁记录的优点,信号写入采用的是激光辅助加热方式,信号读出则是采用高灵敏度的巨磁阻磁头检测磁通方式来进行。开展光磁混合记录介质的研究,对于提高硬盘的记录密度和实现光磁混合记录技术的实用化都有着极其重要的意义。本文围绕新型光磁混合记录介质SmDyCo、SmTbCo系薄膜的微观结构、物理特性及其相关机理,在实验和理论方面进行了比较深入和系统的研究。运用微磁模型及微磁模拟软件SimulMag,对SmDyCo单层磁性膜、有软磁层的SmDyCo磁性膜的磁化特性,动态磁化过程以及读出特性进行了模拟研究,模拟结果与实验结果相吻合。运用微磁理论模型及微磁模拟软件SimulMag研究了双层耦合膜在外场作用下的磁化特性和读出特性,对双层耦合磁性薄膜加入软磁层后的磁化特性和读出特性进行了模拟研究。运用微磁模型及微磁模拟软件OOMMF,对SmTbCo单层磁性膜在不同角度外磁场作用下的磁化特性、磁化过程状态以及能量密度变化进行了系统的模拟。运用微磁模型及微磁模拟软件OOMMF,研究了双层耦合膜的磁化特性和界面磁畴形成条件,运用相关理论解释了双层耦合膜的磁化特性。最后,对不同记录层厚度和读出层厚度情况下薄膜的交换能密度变化进行了研究。更多还原

【Abstract】 Hybrid recording is a novel kind of super-high density information storage method that can break through the super-paramagnetic limit and further increase the recording density as well as the writing and reading data rates of hard disk drives (HDD). It takes advantages from MO and magnetic recording methods. The message writing is by laser-assisted thermal magnetic recording and message reading is by magnetic flux detection with high sensitive GMR sensors. The studies on the developing of new hybrid recording media are very important to the increasing of the area density of HDD and to the implementation of hybrid recoding method. Therefore, this dissertation presents a theoretical and experimental investigation of micro-structure and physical properties as well as relative mechanism of SmDyCo, SmTbCo series thin films for hybrid recording.By using micro-magnetic model and micro-magnetic simulated software-SimulMag, we simulated the magnetic properties and dynamic magnetic process of SmDyCo single magnetic films and SmDyCo magnetic films with soft underlayer systemically. The simulation results were in good accord with the experimental results. The switching behaviors of exchange coupled layers under magnetic fields have been explained by using micro-magnetic model. Finally, we simulated the magnetic properties and readout properties of the exchange coupled double layers with a soft underlayer.By using micro-magnetic model and micro-magnetic simulated software-OOMMF, we simulated the hysteresis properties and magnetization process of SmTbCo single magnetic films systemically at different angles. By using micro-magnetic model, we studied hysteresis properties and the forming condition of the interface magnetic domains of SmTbCo exchange coupled layers. We explained the magnetization of SmTbCo exchange coupled layers. Finally, we studied the effect of film thickness for exchange energy density.更多还原