Recovering magnetic domains of nanoscale-mechanically damaged ferromagnetic thin film of information data storage
Recovering magnetic domains of nanoscale-mechanically damaged ferromagnetic thin film of information data storage
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DOI：
10.1016/j.apmt.2020.100825
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发表时间：
2020-12
影响因子：
8.3
通讯作者：
Chang-Dong Yeo;Muyang He;Jaeho Lee;Nayem M. R. Shah;Yang-Ki Hong;Minyeong Choi;J. H. You;D. Purani
中科院分区：
文献类型：
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作者：
Chang-Dong Yeo;Muyang He;Jaeho Lee;Nayem M. R. Shah;Yang-Ki Hong;Minyeong Choi;J. H. You;D. Purani
利用纳米划痕仪、原子力显微镜和磁力显微镜研究了应力和温度对垂直磁记录介质铁磁薄膜磁畴和划痕形貌的综合影响。由于磁自旋的热搅动，非划痕区域中存储的磁信号随着温度的升高而变弱。高的局部应力永久地破坏划痕中心处的磁信号。然而，由于铁磁性的部分恢复，在轻应力状态下的减弱的磁信号随着温度升高至300 °C而显著恢复。关于纳米划痕形态，当温度升高至300 °C时，划痕由于在划痕表面上积累的金属氧化物（CoO、Cr2 O3和PtO 2）而显著愈合。令人惊讶的是，划痕在400 - 600 °C时加深。这是由于PtO 2的蒸发和磁性颗粒从HCP到FCC的相变。
Combined effects of stress and temperature on magnetic domains and scratch morphology of the ferromagnetic film of a perpendicular magnetic recording media are investigated using nanoscratch, atomic force microscope, and magnetic force microscope. The stored magnetic signals in the non-scratched area become weak with increasing temperature due to the thermal agitation of magnetic spins. The high local stress permanently damages the magnetic signals at the scratch center. However, the weakened magnetic signals at lightly stressed regimes recover significantly with increasing temperature up to 300 °C due to the partial recovery of ferromagnetism. Regarding the nanoscratch morphology, when the temperature increases up to 300 °C, the scratch is healed noticeably due to metal oxides (CoO, Cr2O3, and PtO2) built-up on the scratched surface. Surprisingly, the scratch deepens at 400 - 600 °C. This is attributed to PtO2evaporation and the phase transition of magnetic grains from HCP to FCC.