Magnetic Imaging on Nanomaterials using spectro-microscopy and spin-polarized scanning tunneling microscopy

 

Minn-Tsong Lin

Department of Physics, National Taiwan University, Taipei 10617, Taiwan and

Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan

E-mail: mtlin@phys.ntu.edu.tw

 

Various magnetic imaging approaches are demonstrated to have the excellences of electronic structure and magnetic sensitivity in nanoscaled dimension, including the techniques in application of Photoemision Electron Micrscioy (PEEM) on magnetic ultrathin film, Scanning Electron Microscopy with Polarization Analysis (SEMPA) on magnetic nanoparticle assembly, and Spin-Polarized Scanning Tunneling Microscopy (SP-STM) on ultrathin antiferromagnetic films.

 

 

 

 

 

 

 

 


Fig. 1 PEEM imaging for 6 ML Fe/ n ML Mn/ Cu3Au(100) with indication of magnetization orientation.

A novel perpendicular anisotropy and new kind of spin-reorientation transition were found in ferromagnetic/antiferromagnetic bilayer system due to exchange coupling. With increasing Mn thickness, the magnetic easy axis of 6 ML Fe/n ML Mn/Cu3Au(100) was observed to switch from in-plane to perpendicular direction by PEEM (Fig. 1). The magnetic domain of antiferromagentic Mn layer was shown to be anti-parallel to the Fe domain. Furthermore, the magnetic layer structure of the Mn film on ferromagnetic substrate was also studied by SP-STM. Magnetic structure with closed vortex will be also obtained for self-aligned magnetic Co and Fe nanoparticle assembly by using SEMPA.

 

 

　

　

　

　

　

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[5] C. H. Chuang, C. H. Chen, Y. M. Chang, C. W. Peng, S. S. Wong, S. D. Tseng, S. Gwo, Y. Zhu, C. H. Sow, and Minn-Tsong Lin, Appl. Phys. Lett. 91, 183101 (2007). 

[6] C. B. Wu, P. J. Hsu, H. Y. Yan, and Minn-Tsong Lin, Appl. Phys. Lett. 91, 202507 (2007).