Energy Barrier Enhanced by Higher Order Magnetic Anisotropy Terms
Energy Barrier Enhanced by Higher Order Magnetic Anisotropy Terms
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高阶磁各向异性项增强的能量势垒
DOI：
10.1143/jjap.42.l455
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发表时间：
2003
影响因子：
1.5
通讯作者：
Y. Shimada
中科院分区：
文献类型：
--
作者：
O. Kitakami;S. Okamoto;N. Kikuchi;Y. Shimada
我们研究了高阶磁各向异性项对单轴细颗粒的不可逆转换场、能垒和磁化强度转换动力学的影响。高阶项有效地增强了能垒，而开关场没有显着变化，使我们能够实现饱和记录和良好的热稳定性。研究发现，由于高阶项的存在，磁化矢量的动力学稍微减慢，但当它们相对于最低阶各向异性项不是那么大时，影响非常小。
We have studied the effects of higher order magnetic anisotropy terms on the irreversible switching field, the energy barrier, and the dynamics of magnetization switching of an uniaxial fine particle. The higher order terms effectively enhance the energy barrier without notable change in the switching field, enabling us to attain both saturation recording and good thermal stability. It is found that dynamics of the magnetization vector slightly slows down due to the presence of the higher order terms, but the effect is very small when they are not so large with respect to the lowest order anisotropy term.