Carl E. Patton

Professor
B.S., MIT, 1963; Ph.D., Cal Tech., 1967; Fellow, American Physical Society; Fellow, IEEE.
(970) 491-5083

Magnetism and Magnetic Materials

The magnetics laboratory is engaged in a variety of basic and applied problems which range from the fundamental understanding of magnetic order to the study of materials and device structures for memory and high frequency applications. The present emphasis is on microwave and millimeter wave excitations and nonlinear processes and ferrite materials. These research activities have been supported by numerous government agencies and industrial sponsors, such as the National Science Foundation, the Army Research Office, the Office of Naval Research, the Air Force (RADC), NASA, NATO, IREX, Rockwell International, Honeywell, Verbatim, TRW, Ampex, Westinghouse, and Northrop Grumman. The group has an international flavor, with research students and visiting scientists from Bulgaria, China, England, Germany, India, Italy, Japan, Russia, Slovakia, and Switzerland.

Fundamental research in magnetism has been in such diverse areas as domain wall dynamics in thin films, the effect of chemical short range and long range atomic order on the magnetic state of systems with competing ferromagnetic and antiferromagnetic order, spin canting in ferrites with nonmagnetic substitutions, microwave relaxation processes in ferromagnetic thin films, microwave loss mechanisms in ferrites, nonlinear dynamics in magnetic systems, magnetism in spin glasses, Brillouin light scattering on magnetic excitations, giant magnetoresistance in thin film sandwiches, and microwave magnetic envelope solitons in thin films. Applied research has been concerned with studies of lunar soil magnetism, microstructure in ferrites, magnetic films for perpendicular recording and high density storage, metallic powders for absorber applications, new materials for millimeter wave applications, microwave soliton thin film devices, and surface damage effects in recording head materials.

AVAILABLE POSITIONS

Inquiries are welcome from senior scientists interested in visiting sabbatical appointments or other visiting appointments, recently graduated Ph.D. scientists interested in postdoctoral appointments, and prospective graduate students with an interest in magnetics research.

The Magnetism and Magnetic Materials Program offers opportunities for creative basic and applied research, productive work with an international team of students and scientists, individual accomplishment and teamwork toward project goals, archival publications, participation in international conferences, and interaction with scientists and engineers in basic and applied magnetics from around the world.

CURRENT RESEARCH SUPPORT

High frequency properties of ferrite films for microwave and millimeter wave devices, Office of Naval Research

Microwave magnetic solitons in ferrite films - physics and devices for radar, electronic countermeasures, and surveillance, U. S. Army Research Office

The fundamental physics of envelope solitons - microwave solitons in magnetic thin films, National Science Foundation

RECENT PUBLICATIONS

"Observation of the amplification of spin-wave envelope solitons in ferromagnetic films by parallel magnetic pumping," B. A. Kalinikos, N. G. Kovshikov, M. P. Kostylev, P. Kabos, and C. E. Patton, Pis'ma Zh. Éksp. Teor. Fiz. 66, 346-350 (1997) [JETP Lett. 66, 371-375 (1997)].

"Decay free microwave magnetic envelope soliton pulse trains in yttrium iron garnet thin films," B. A. Kalinikos, N. G. Kovshikov, and C. E. Patton, Phys. Rev. Lett. 78, 2827-2830 (1997).

"Static magnetic and microwave properties of Li-ferrite films prepared by pulsed laser deposition," F. J. Cadieu, R. Rani, W. Mendoza, B. Peng, S. A. Shaheen, M. J. Hurben, and C. E. Patton, J. Appl. Phys. 81, 4801-4803 (1997).

"Angle dependence of the ferromagnetic resonance linewidth in easy-axis and easy-plane single crystal hexagonal ferrite disks," M. J. Hurben, D. R. Franklin, and C. E. Patton, J. Appl. Phys. 81, 7458-7467 (1997).

"High-resolution Brillouin light scattering and angle-dependent 9.4 GHz ferromagnetic resonance in MBE-grown Fe/Cr/Fe on GaAs," S. M. Rezende, M. A. Lucena, F. M. de Aguiar, A. Azevedo, C. Chesman, P. Kabos, and C. E. Patton, Phys, Rev. B55, 8071-8074 (1997).

"Spin wave instability magnon distribution for parallel pumping in yttrium iron garnet films at 9.5 GHz," P. Kabos, M. Mendik, G. Wiese, and C. E. Patton, Phys. Rev B55, 11457-11465 (1997).

"Decay properties of microwave magnetic envelope solitons in yttrium iron garnet films," H. Xia, P. Kabos, C. E. Patton, and H. E. Ensle, Phys. Rev. B55, 15018-15025 (1997).

"Observation of self-generation of dark envelope solitons for spin waves in ferromagnetic films," B. A. Kalinikos, N. G. Kovshikov, and C. E. Patton, Pis'ma Zh. Eksp. Teor. Fiz. 68, 229-233 (1998) [JETP Lett. 68, 243-247 (198)].

"Active magnetostatic wave delay line," Y. K. Fetisov, P. Kabos, and C. E. Patton, IEEE Trans. Magnetics 34, 259-270 (1998).

"Brillouin light scattering and magnon wave vector distributions for microwave magnetic envelope solitons in yttrium iron garnet thin films," H. Xia, P. Kabos, H. Y. Zhang, P. Kolodin, and C. E. Patton, Phys. Rev. Lett. 81, 449-452 (1998).

"Amplification of microwave magnetic envelope solitons in thin yttrium iron garnet films by parallel pumping," P. A. Kolodin, P. Kabos, C. E. Patton, B. A. Kalinikos, N. G. Kovshikov, and M. P. Kostylev, Phys. Rev. Lett. 80, 1972-1975 (1998).

"Calculation of the formation time for microwave magnetic envelope solitons," R. A. Staudinger, P. Kabos, H. Xia, B. T. Faber, and C. E. Patton, IEEE Trans. Magnetics 34, 2334-2338 (1998).

"Phase profiles of microwave magnetic envelope solitons," J. M. Nash, P. Kabos, R. Staudinger, and C. E. Patton, J. Appl. Phys. 83, 2689-2699 (1998).

"On the velocity characteristics of microwave magnetic envelope solitons," H. Xia, P. Kabos, R. A. Staudinger, and C. E. Patton, Phys. Rev. B58, 2708-2715 (1998).

"The modeling of microwave magnetic envelope solitons in thin ferrite films through the nonlinear Schrödinger equation," H. Y. Zhang, P. Kabos, H. Xia, R. A. Staudinger, P. A. Kolodin, and C. E. Patton, J. Appl. Phys.84, 3776-3785 (1998).

"Self-generation of microwave magnetic envelope soliton trains in yttrium iron garnet thin films," B. A. Kalinikos, N. G. Kovshikov, and C. E. Patton, Phys. Rev. Lett. 80, 4301-4304 (1998).

"Theory of two magnon scattering microwave relaxation and ferromagnetic resonance linewidth in magnetic thin films," M. J. Hurben and C. E. Patton, J. Appl. Phys. 83, 4344-4365 (1998).