Magnetic properties and the surface morphology of Fe deposited on Pt/Al2O3(1 1 2̄ 0) were in situ studied by magneto-optical Kerr effect (MOKE) and scanning tunneling microscopy (STM), respectively. The surface morphology exhibits that the as-deposited Fe nanoparticels have a narrow sized distribution of diameter around 4.2 nm, revealing the major out-of-plane magnetization. After annealing to 200 °C, this out-of-plane magnetization is strongly enhanced while the sized distribution of nanoparticles is almost unchanged. For the further annealing procedure to 400 °C, the nanoparticles begin to coalesce into larger ones. Meanwhile, the magnetization reorients from out-of-plane to in-plane direction. Therefore, clear evidence of concurrence for nanoparticles coalescence and magnetization reorientation show that the surface evolution plays an important role on the magnetic transition.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics