Monday, February 2, 2009, 10:00 am — Bldg. 735 - Conf Rm A
We have successively developed brighter field-emission electron beams over 30 years and used them to directly observe the microscopic distribution of magnetic fields [1] by using the wave nature of electrons.
Magnetic lines of force can be observed quantitatively in h/e flux units by interference microscopy and the dynamics of quantized vortices in superconductors can be observed by Lorentz microscopy.
In my talk, I will describe most recent results obtained during my Okinawa Project (http://www.oist.jp/index.html), which includes research on magnetic heads for perpendicular recording [2], Josephson vortices in YBCO thin film, and the nucleation process of the ferromagnetic phase assisted by magnetic fields in colossal magnetoresistance.
[1] A. Tonomura: “Direct observation of thitherto unobservable quantum phenomena by using electrons” Proc. Natl. Acad. Sci. USA. 102 No.42 (2005) 14952-14959.
[2] J. J. Kim, K. Hirata, Y. Ishida, D. Shindo, M. Takahashi, and A. Tonomura: ”Magnetic domain observation in writer pole tip for perpendicular recording head by electron holography” Appl. Phys. Lett. 92 (2008) 162501/1-162501/3.
Hosted by: Yimei Zhu
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