Magnetic domain structures in ultrathin FexNi(1−x) films on Cu(111): Dependence on film thickness and stoichiometry

Sato, Y.; Johnson, T. F.; Chiang, S.; Giacomo, J. A.; Zhu, X. D.; Land, D. P.; Nolting, F.; Scholl, A.

doi:doi:10.1116/1.1631295

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Journal of Vacuum Science & Technology A / Volume 22 / Issue 1 / ARTICLES

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J. Vac. Sci. Technol. A 22, 135 (2004); http://dx.doi.org/10.1116/1.1631295 (5 pages)

Magnetic domain structures in ultrathin Fe_xNi_(1−x) films on Cu(111): Dependence on film thickness and stoichiometry

Y. Sato¹, T. F. Johnson¹, S. Chiang¹, J. A. Giacomo¹, X. D. Zhu¹, D. P. Land², F. Nolting³, and A. Scholl³

¹Department of Physics, University of California, Davis, California 95616
²Department of Chemistry, University of California, Davis, California 95616
³Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720

(Published online 8 January 2004)

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The magnetic domain structures in thin Fe_xNi_(1−x) alloy films grown on Cu(111) have been investigated by the photoemission electron microscope (PEEM). By tuning the photon energy to respective x-ray absorption edges, element-specific information can be obtained with PEEM. We have observed clear ferromagnetic domains on samples with an iron concentration of x⩽0.6 and x=1.0. The PEEM images indicate that Fe and Ni form a good alloy on Cu(111), with the same domain structures and the magnetization in each domain aligned for both elements. The domain sizes and shapes exhibit dependence on thickness, stoichiometry x, and substrate quality. © 2004 American Vacuum Society.