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Miami University
Dr. Michael J. Pechan

Professor and Chair
Department of Physics
Phone: 513-529-4518
Fax: 513-529-5629
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Dr. Michael J. Pechan
Dr. Michael J. Pechan "I explore magnetodynamics and magnetostatics in reduced dimensional systems such as bilayer, multilayer, and magnetic dot and antidot based systems, as well as in molecular magnet systems. Enhancements to the techniques of ferromagnetic resonance and dc magnetometry are also ongoing. My work is done in collaboration with scientists from other universities, and national and industrial laboratories."


Description of Research
Nanoscale magnetic systems are providing a wealth of novel phenomena in condensed matter magnetism. Of particular significance are effects arising from epitaxial and otherwise laterally constrained systems which include ferromagnetic/semiconductor spintronic systems; exchange biased structures; systems with appreciable in-plane anisotropies, and magnetic dot and anti-dot arrays. In addition, significant developments are being made in the exciting interdisciplinary field of molecular magnets, wherein nanoscale magnetic units with large moments are being synthesized. I explore magnetodynamics and magnetostatics in reduced dimensional systems such as bilayer, multilayer, and magnetic dot and antidot based systems, as well as in molecular magnet systems. Enhancements to the techniques of ferromagnetic resonance and dc magnetometry are also ongoing. My work is done in collaboration with scientists from other universities, and national and industrial laboratories.

Undergraduate researcher's roles in your lab
I typically involve three or four undergraduates per year in my research, of which approximately half will appear as co-author on refereed publications or conference presentations.

Graduate student's role in your lab
I have directed the thesis work of 23 Masters students, the majority of which appear as co-authors on refereed publications or conference presentations.

Presentations

"Magnetic properties of a non-interpenetrating chiral porus cobalt metal-organic framework (MOF)." Chengtao Yu, Shengqian Ma, Michael J. Pechan and Hong-cai Zhou. 2007 MMM/Intermag Conference. Baltimore, MD.

"Ferromagnetic resonance in the proximity of an unstable equilibrium: a study in permalloy thin films and nano-scale dots." Michael J. Pechan, Chengtao Yu, Ryan Bennett, Jordan Katine, Liesl Folks, Matthew Carey. 2007 MMM/Intermag Conference. Baltimore, MD.

"Vortex magnetodynamics: ferromagnetic resonance in Permalloy dot arrays." Michael J. Pechan, Chengtao Yu, Dane Owen, Jordan Katine, Leisl Folks and Matthew Carey. 2006 Ohio Nanotechnology Symposium. Columbus, OH.

"Parallel and anti-parallel coupling of CoPt/Ru/CoFe trilayers investigated with magnetometry and ferromagnetic resonance." Michael J. Pechan, Chengtao Yu and Stefan Maat. 2006 APS March Meeting, Baltimore, MD.

"Ferromagnetic resonance in the stripe domain state: a study in Co2MnGa (001)." Chengtao Yu, Michael J. Pechan, David Carr and Chris J. Palmstrøm. 2005 MMM Conference. San Jose, CA.

"Vortex magnetodynamics: ferromagnetic resonance in Permalloy dot arrays." Michael J. Pechan, Chengtao Yu, Dane Owen, Jordan Katine, Leisl Folks and Matthew Carey. 2005 MMM Conference. San Jose, CA.

"Magnetodynamics of multi-scale magnetic dots in the vortex state." Dane Owen, Chengtao Yu, Michael J. Pechan, Jordan Katine, Leisl Folks and Matthew Carey. Spring 2005 Ohio Section Meeting of the APS. Dayton, OH.

"Ferromagnetic resonance modes of the vortex state in Permalloy dot arrays." Chengtao Yu, Mark Zimmerman, Michael Pechan, Jordan Katine, Leisl Folks and Matthew Carey. 2005 APS March Meeting. Los Angles, CA.

"Spin waves in perpendicularly magnetized nanoscale permalloy dots." Mark Zimmerman, Chengtao Yu, Michael Pechan, Jordan Katine, Leisl Folks and Matthew Carey. 2005 APS March Meeting. Los Angles, CA.

"In-plane spin wave modes in permalloy antidot arrays - observation and analysis." Chengtao Yu, Michael J. Pechan and Gary Mankey. 2005 APS March Meeting. Los Angles, CA.

Invited talk. "Direct measurement of spatially localized FMR modes in an antidot lattice." Michael J. Pechan, Chengtao Yu, R. L. Compton, J. P. Park, and P. A. Crowell. 2004 MMM Conference. Jacksonville, FL. November 2004.

Funding
$100.000 Grant from the State of Ohio
Nanomaterials in our Environment

$100.000 Grant from the State of Ohio
Nanomaterials in our Environment
Publications

"Ferromagnetic resonance in the stripe domain state: a study in Co2MnGa (001)". Chengtao Yu, Michael J. Pechan, David Carr and Chris J. Palmstrøm. J. Appl. Phys. 99, 08J107 (2006).

"Vortex magnetodynamics: ferromagnetic resonance in Permalloy dot arrays". Michael J. Pechan, Chengtao Yu, Dane Owen, Jordan Katine, Liesl Folks and Matthew Carey. J. Appl. Phys. 99, 08C702 (2006).

"Magnetic Properties of Uniaxial Synthetic Antiferromagnets for Spin Valve Applications." Zhiya Zhao, G. J. Mankey, G. Gubbiotti, S. Tacchi, W.T. Lee, C.T. Yu and M.J. Pechan. Phys. Rev. B, 71, 104417 (2005).

"Nanostructure optimization and magnetic property enhancement in magnetically annealed Nd2Fe14B/a-Fe - type nanocomposites." B. Cui, C. Yu, K. Han, J. Liu, H. Garmestani, M. Pechan and H. Schneider-Muntau. J. Appl. Phys. 97, 10F308 (2005).

"Direct measurement of spatially localized FMR modes in an antidot lattice." Michael J. Pechan, Chengtao Yu, R. L. Compton, J. P. Park, and P. A. Crowell. J. Appl. Phys., 97 10J903 (2005). Also selected as a focus article in Virtual Journal of Nanoscale Science and Technology, Vol. 11, Issue 20 (2005).

"Remarkable strain induced magnetic anisotropy in epitaxial Co2 MnGa Films." Michael J. Pechan, Chengtao Yu, David Carr and Chris J. Palmstrom. J. Magn. Magn. Mater, 286, 340 (2005).

"Lateral standing spin waves in permalloy antidot arrays." Chengtao Yu, Michael J. Pechan, Wesley A. Burgei and Gary J. Mankey. J. Appl. Phys., 95, 6648 (2004).

"Dipolar induced, spatially localized resonance in magnetic antidot arrays." Chengtao Yu, Michael J. Pechan and Gary J. Mankey. Appl. Phys. Lett., 83, 3948 (2003).

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