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"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."
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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.
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| Presentations |
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"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.
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| 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
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| Publications |
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"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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