Institute of Applied Physics, Hamburg University, Hamburg, Germany.
Science. 2013 Jan 4;339(6115):55-9. doi: 10.1126/science.1228519.
The future of nanoscale spin-based technologies hinges on a fundamental understanding and dynamic control of atomic-scale magnets. The role of the substrate conduction electrons on the dynamics of supported atomic magnets is still a question of interest lacking experimental insight. We characterized the temperature-dependent dynamical response of artificially constructed magnets, composed of a few exchange-coupled atomic spins adsorbed on a metallic substrate, to spin-polarized currents driven and read out by a magnetic scanning tunneling microscope tip. The dynamics, reflected by two-state spin noise, is quantified by a model that considers the interplay between quantum tunneling and sequential spin transitions driven by electron spin-flip processes and accounts for an observed spin-transfer torque effect.
纳米级自旋技术的未来取决于对原子级磁体的基本理解和动态控制。基底传导电子对支撑原子磁体动力学的影响仍然是一个缺乏实验洞察力的问题。我们描述了由几个通过交换耦合吸附在金属基底上的原子自旋组成的人造磁体的温度相关动力学响应，这些磁体通过磁性扫描隧道显微镜针尖驱动和读出自旋极化电流。通过一个模型来量化动力学，该模型考虑了量子隧穿和电子自旋翻转过程驱动的顺序自旋跃迁之间的相互作用，并解释了观察到的自旋转移力矩效应。
