All oxide ferromagnet/semiconductor epitaxial heterostructures

Nielsen, A.; Brandlmaier, A.; Althammer, M.; Kaiser, W.; Opel, M.; Simon, J.; Mader, W.; Goennenwein, S. T. B.; Gross, R.
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p162510
Academic Journal
Oxide based ferromagnet/semiconductor heterostructures offer substantial advantages for spin electronics. We have grown (111) oriented Fe3O4 thin films and Fe3O4/ZnO heterostructures on ZnO(0001) and Al2O3(0001) substrates by pulsed laser deposition. High quality crystalline films with mosaic spread as small as 0.03°, sharp interfaces, and rms surface roughness of 0.3 nm were achieved. Magnetization measurements show clear ferromagnetic behavior of the magnetite layers with a saturation magnetization of 3.2μB/f.u. at 300 K. Our results demonstrate that the Fe3O4/ZnO system is an intriguing and promising candidate for the realization of multifunctional heterostructures.


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