Centre for Nonlinear Dynamics, School of Physics, Bharathidasan University, Tiruchirapalli 620 024, India.
J Phys Condens Matter. 2011 Feb 2;23(4):046004. doi: 10.1088/0953-8984/23/4/046004. Epub 2011 Jan 12.
Precessional magnetization switching in ferromagnetic nanofilms such as permalloy (Py), cobalt (Co), nickel (Ni) and iron (Fe) of 5 nm thickness with magnetic surface anisotropy (MSA) is investigated analytically in the presence of a magnetic field. When the strength of the applied magnetic field is increased beyond a threshold value, the time taken for reversing the magnetization in the above films decreases steadily. Among the films, Py requires the lowest magnetic field (3.98 kA m( - 1)) to reverse the magnetization and Co needs the largest (21.49 kA m( - 1)). Further, the time taken to reverse magnetization in Py film (06.46 ps) is far less than the reversal time in the case of Fe film (16.74 ps). It is found that MSA reduces the switching time significantly. Among the different films, Py is identified as a good candidate for use in ferromagnetic devices due to its energy efficient character.
具有磁各向异性（MSA）的 5nm 厚铁磁纳米薄膜（如坡莫合金（Py）、钴（Co）、镍（Ni）和铁（Fe））在外磁场中进行了进动磁化切换的分析研究。当外加磁场强度增加到超过一个阈值时，上述薄膜中磁化反转所需的时间会持续稳定地减少。在这些薄膜中，Py 需要的磁场强度最低（3.98kA/m）来反转磁化，而 Co 需要的最大（21.49kA/m）。此外，Py 薄膜中反转磁化所需的时间（06.46ps）远小于 Fe 薄膜的反转时间（16.74ps）。研究发现，MSA 显著地减少了开关时间。在不同的薄膜中，Py 因其节能的特性被确定为铁磁器件的一个很好的候选材料。
