Professor Kirby's research is directed towards the understanding of magnetism in nanoscale and nanostructured materials, including thin films, multilayer films, and laterally patterned films. His group has fabricated one- and two-dimensional arrays of laterally structured magnetic systems by direct interference laser annealing, which is a very versatile method of varying materials properties without modifying surface topography. This technique can be used to form nanoscale arrays of dots and/or antidots in thin magnetic films. This has led to the observation of a magnetic anisotropy lattice, in which magnetic dots of in-plane magnetic anisotropy are formed in a background of perpendicular magnetic anisotropy. His group has developed several optical systems for studying magneto-optical properties of thin film and bulk samples over a wide range of wavelengths and temperatures. Most recently, his group has developed a “pump-probe” magneto-optical system based on a femtosecond laser, which permits the observation of magnetization precession and damping in thin films in a variety of experimental configurations. This system can provide a detailed understanding of magnetic coupling between nanoelements in thin films, multilayers and laterally structured materials.
Recent Key Publications
Steven A. Michalski, Jian Zhou, Ralph Skomski, and Roger D. Kirby, “Coupled precession modes in indirect exchange-coupled [Pt/Co]-Co thin films,” J. Applied Physics 101, 09D115-1 to 09D115-3 (2007).
Nikolay I. Polushkin, Steven A. Michalski, Lanping Yue, and Roger D. Kirby, “Evidence of long-wavelength collective excitations in magnetic superlattices,” Phys. Rev. Letters 97, 256401 (2006).
Aliekber Aktag, S. Michalski, L. Yue, R. D. Kirby, and Sy-Hwang Liou, “Formation of an anisotropy lattice in Co/Pt multilayers by direct laser interference patterning,” J. Appl. Phys. 99, 093901-1 to 093901-9 (2006).
R. Skomski, J. Zhou, R. D. Kirby, and D. J. Sellmyer, “Micromagnetic energy barriers,” J. Appl. Phys. 99, 08B906-1 to 08B906-3 (2006).
R. Skomski, J. Zhou, R. D. Kirby, and D. J. Sellmyer, “Magnetic aging,” Proceedings of the Materials Research Society, Symposium 887, pp. 133-138, Eds. M Chipara, O. Puglisi, R. Skomski, F. Jones, B. Hsiao (2006).
R. Skomski, J. Zhou, R. D. Kirby, and D. J. Sellmyer, “Fast and slow magnetization processes in magnetic recording media, Proceedings of the Materials Research Society,” Symposium 887, pp. 139-144, Eds. M Chipara, O. Puglisi, R. Skomski, F. Jones, B. Hsiao (2006).
L. Y. Chen, S. Y. Wang, and R. D. Kirby, “Magneto-optical properties of nanostructured media” (Review Chapter), in book Advanced Magnetic Materials, Kluwer Academic/Plenum and Tsinghua University Press, 2006 (Y. Liu, D. Shindo, D. J. Sellmyer, Eds.)
Recent Graduates and Current Affiliations
· Bob Buckley, B.S. 2007. Physics graduate program at UC-Santa Barbara.
· Nikolay Polushkin, was Visiting Assistant Professor 2004-2006. Now returned to his home institution at Russian Academy of Sciences, Nishniy Navgorad.
· Aliekber Aktag, Ph.D. 2004. Now is Assistant Professor, Abant Izzet Baysal Universitesi, Turkey.