Bode M, Pietzsch O, Kubetzka A, Wiesendanger R
Institute of Applied Physics and Microstructure Research Center, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
Phys Rev Lett. 2004 Feb 13;92(6):067201. doi: 10.1103/PhysRevLett.92.067201. Epub 2004 Feb 12.
The thermal switching behavior of individual perpendicularly magnetized nanoscale Fe islands consisting of 200-600 atoms only is studied by low-temperature spin-polarized scanning tunneling microscopy. Our results reveal that the switching rate is strongly affected by the particle shape; i.e., elongated islands switch much more rapidly than compact islands of the same volume. This observation is explained by different processes of magnetization reversal. Our results suggest that compact magnetic particles are an ideal choice for future perpendicular magnetic recording media because they are robust against thermal magnetization reversal.
通过低温自旋极化扫描隧道显微镜研究了仅由200 - 600个原子组成的单个垂直磁化纳米级铁岛的热开关行为。我们的结果表明，开关速率受颗粒形状的强烈影响；即，细长的岛比相同体积的紧凑岛切换得快得多。这一观察结果可以用不同的磁化反转过程来解释。我们的结果表明，紧凑的磁性颗粒是未来垂直磁记录介质的理想选择，因为它们对热磁化反转具有抗性。
