Ion Irradiation Control of Ferromagnetism in (Ga,Mn)As

Details Ion Irradiation Control of Ferromagnetism in (Ga,Mn)As Ion Irradiation Control of Ferromagnetism in (Ga,Mn)As

2005-05-15

arxiv.org/abs/cond-mat/0505365v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to appear in Jpn. J. Appl. Phys. (Part 2 Letters)

Scientific paper

10.1143/JJAP.44.L816

We report on a promising approach to the artificial modification of ferromagnetic properties in (Ga,Mn)As using a Ga$^+$ focused ion beam (FIB) technique. The ferromagnetic properties of (Ga,Mn)As such as magnetic anisotropy and Curie temperature can be controlled using Ga$^+$ ion irradiation, originating from a change in hole concentration and the corresponding systematic variation in exchange interaction between Mn spins. This change in hole concentration is also verified using micro-Raman spectroscopy. We envisage that this approach offers a means of modifying the ferromagnetic properties of magnetic semiconductors on the micro- or nano-meter scale.

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