报告题目: |
An atomic-scale look at magnetism on surfaces |
报告人: |
Andreas Heinrich |
|
Dr. IBM Research Center
|
报告时间: |
2009-07-09 10:30 |
报告地点: |
物理系三楼报告厅 |
主办单位: |
物理系 |
简介: |
报告摘要：Understanding and controlling the magnetic properties of nanoscale systems is crucial for the implementation of future data storage and computation paradigms. I will discuss how the magnetic properties of individual atoms can be probed with a low-temperature, high-field scanning tunneling microscope when the atoms are placed on a thin insulator. We find clear evidence of magnetic anisotropy in the spin excitation spectra of individual magnetic atoms embedded in a non-magnetic surface. In extended one-dimensional spin chains, which we built one atom at a time, we find strong spin-coupling into collective quantum-spins, even for the longest chains of length 3.5nm. When magnetic atoms are transferred to an otherwise non-magnetic tip, spin-polarized tunneling currents can be obtained and these can be used to efficiently pump spin systems out of thermal equilibrium. |
|
