Ballistic hole magnetic microscopy

Haq, E.; Banerjee, T.; Siekman, M. H.; Lodder, J. C.; Jansen, R.
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p082502
Academic Journal
A technique to study nanoscale spin transport of holes is presented: ballistic hole magnetic microscopy. The tip of a scanning tunneling microscope is used to inject hot electrons into a ferromagnetic heterostructure, where inelastic decay creates a distribution of electron-hole pairs. Spin-dependent transmission of the excited hot holes into an underlying p-type semiconductor collector induces a hole current in the valence band of the semiconductor, with magnetocurrent values up to 180%. The spin-filtering of holes is used to obtain local hysteresis loops and magnetic imaging with spatial resolution better than 30 nm.


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