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Author: sudook kim
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1. Effects of shape distortions and imperfections on mode frequencies and collective linewidths in nanomagnets
Published: 3/28/2011
Authors: Hans Toya Nembach, Justin M Shaw, Thomas J Silva, Ward L Johnson, Sudook A Kim, Robert D McMichael, Pavel Kabos
Abstract: We used Brillouin light scattering to show that shape distortions in Ni80Fe20 nanoelements can have a dramatic effect on the measured linewidth of certain modes. By intentionally introducing an amount of ,egg-likeŠ shape distortion to an ideal ellip ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907044

2. Elastic constants and dimensions of imprinted polymeric nanolines determined from Brillouin light scattering
Published: 1/18/2010
Authors: Ward L Johnson, Sudook A Kim, Roy Howard Geiss, Colm Flannery, Paul R Heyliger, Christopher L Soles, Wen-Li Wu, Chengqing C. Wang, Christopher M Stafford, B D. Vogt
Abstract: Elastic constants and cross-sectional dimensions of imprinted nanolines of poly(methyl methacrylate) (PMMA) on silicon are determined nondestructively from finite-element inversion analysis of dispersion curves of hypersonic acoustic modes of these ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903959

3. Optimization of arrays of gold nanodisks for plasmon-mediated Brillouin light scattering
Published: 7/22/2009
Authors: Ward L Johnson, Sudook A Kim, Zhandos Utegulov, B. T. Draine
Abstract: Distributions of electric fields in two-dimensional arrays of gold nanodisks on a Si3N4 membrane, with light incident through the membrane, are modeled with the aim of determining array geometries for effective plasmon-mediated Brillouin light scat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854474

4. Surface-plasmon-enhanced electric fields in two-dimensional arrays of gold nanodisks
Published: 8/4/2008
Authors: Ward L Johnson, Sudook A Kim, Zhandos Utegulov, B. T. Draine
Abstract: Electric-field distributions in two-dimensional arrays of gold nanodisks on Si3N4 membranes are modeled, using the discrete-dipole approximation, as a function of nanodisk diameter (20 − 50 nm), height (10 − 100 nm), ratio of the array sp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854107

5. Mode-selective acoustic spectroscopy of trigonal piezoelectric crystals
Published: 5/1/2008
Authors: Ward L Johnson, Carlos F. Martino, Sudook A Kim, Paul R Heyliger
Abstract: A noncontacting electromagnetic-acoustic-resonance technique is presented for generating and detecting vibrational modes with prescribed symmetries in piezoelectric trigonal crystals with cylindrical geometry. This technique provides the experimental ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50441

6. Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and {alpha}-iron
Published: 4/15/2007
Authors: Sudook A Kim, Ward L Johnson
Abstract: The elastic constants and internal friction of induction hardened and unhardened SAE 1050 plain-carbon steel were determined by acoustic resonance spectroscopy. The hardened specimen contained only martensite and the unhardened specimen was ferrite-p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50255

7. Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and {alpha}-iron
Published: 1/2/2007
Authors: Sudook A Kim, Ward L Johnson
Abstract: The elastic constants and internal friction of induction hardened and unhardened SAE 1050 plain-carbon steel were determined by acoustic resonance spectroscopy. The hardened specimen contained only martensite and the unhardened specimen was ferrite- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50233

8. Surface-plasmon enhancement of Brillouin light scattering from gold-nanodisk arrays on glass
Published: 1/1/2007
Authors: Zhandos Utegulov, B. T. Draine, Sudook A Kim, J. M. Shaw, Ward L Johnson
Abstract: Enhancement of Brillouin light scattering (BLS) at 532 nm was observed from Rayleigh-like and Sezawa-like acoustic modes of alkaline-earth boro-aluminosilicate glass covered with periodic arrays of gold nanodisks. This enhancement is larger than that ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50589

9. Characterization of Magnetic Properties at Edges by Edge Mode Dynamics
Published: 4/21/2006
Authors: Brian B. Maranville, Robert D McMichael, Sudook A Kim, Ward L Johnson, C A Ross, J Cheng
Abstract: We have used trapped spinwave or edge modes of magnetic precession to probe the magnetic environment near magnetic film edges magnetized perpendicular to the edge. Micromagnetic models of dynamics in stripes reveal that the edge mode frequency-fie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853548

10. Elastodynamic characterization of imprinted nanolines
Published: 4/3/2006
Authors: Ward L Johnson, Colm Flannery, Sudook A Kim, Roy Howard Geiss, Christopher L Soles, Paul R Heyliger
Abstract: Experimental techniques employing Brillouin light scattering (BLS) and analytical techniques employing finite-element (FE) and Farnell-Adler models are being developed for characterizing acoustic modes and determining elastic moduli and dimensions o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50332



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