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Magnetostrictive iron gallium thin films grown onto antiferromagnetic manganese nitride: Structure and magnetism
A. E. Clark, K. B. Hathaway, M. Wun-Fogle, J. B. Restorff, T. A. Lograsso, V. M. Keppens, G. Petculescu, and R. A. Taylor, J. Appl. Phys. 93, 8621 (2003).
D. E. Parkes, S. A. Cavill, A. T. Hindmarch, P. Wadley, F. McGee, C. R. Staddon, K. W. Edmonds, R. P. Campion, B. L. Gallagher, and A. W. Rushforth, Appl. Phys. Lett. 101, 072402 (2012).
M. Barturen, B. Rache Salles, P. Schio, J. Milano, A. Butera, S. Bustingorry, C. Ramos, A. J. A. de Oliveira, M. Eddrief, E. Lacaze, F. Gendron, V. H. Etgens, and M. Marangolo, Appl. Phys. Lett. 101, 092404 (2012).
Since for some samples, the RHEED patterns were recorded at temperatures higher than RT, these values were corrected for thermal expansion with bulk coefficients taken from literature.14
Given that our films are single crystalline, additional separate XRD measurements were performed with the samples tilted at specific angles that allowed the (101) and (112) reflections to be detected. Using these peak values and after eliminating the cubic symmetry (when applicable), in-plane lattice constants were calculated for a tetragonal system.
A. Hubert and R. Schäfer, Magnetic Domains: The Analysis of Magnetic Microstructures ( Springer, Berlin, 2000).
F. Lihl, P. Ettmayer, and A. Kutzelnigg, Z. Metallkd. 53, 715 (1962).
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We report structural and magnetic properties of magnetostrictive (x 15) alloys when deposited onto antiferromagnetic manganese nitride and non-magnetic magnesium oxide substrates. From X-ray diffraction measurements, we find that the FeGa films are single crystalline. Scanning tunneling microscopy imaging reveals that the surface morphologies are dictated by the growth temperature, composition, and substrate. The magnetic properties can be tailored by the substrate, as found by magnetic force microscopy imaging and vibrating sample magnetometry measurements. In addition to pronounced tetragonal deformations, depositing FeGa onto manganese nitride leads to the formation of stripe-like magnetic domain patterns and to the appearance of perpendicular magnetic anisotropy.
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