Romel Del Rosario Gomez

Distinguished Appointments and Awards

·  Celebrating Teachers Award - Center for Teaching Excellence, Univ. of Maryland, 2001

·  Recipient , National Science Foundation CAREER Award 2000

·  Chair, Publications Committee, 8th Joint MMM-Intermag Conference, San Antonio, TX 2001

·  Chair, Publications Committee, IEEE Intermag 2000 Conference, Toronto, CA, 2000

·  George Corcoran Award for Significant Contributions to Electrical Engineering Education", University of Maryland 1998.

·  Editorial Board Member, IEEE Transactions on Magnetics 1996-2001

·  Editor of the IEEE Transactions on Magnetics and Program Committee Member: Intermag '97 Conference, New Orleans, LA and Intermag '96 Conference, Seattle, WA

·  Distinguished Visiting Scientist", The Royal Institute of Technology, Stockholm, Sweden, Summer 1992.

·  "Excellence in Graduate Research Award", Sigma Xi Scientific Society, University of Maryland, 1987.

·  "Excellence in Teaching", Wayne State University, 1984

Patents and Disclosures:

·  United States Patent 5,264,794 "Method for Measuring Surface Magnetic Fields Using a Scanning Tunneling Microscope and Magnetic Probe" with Ed Burke, Isaak Mayergoyz and Amr Adly, Assigned to the United States Government as represented by the Director of the National Security Agency

·  United States Patent 6,178,813 "Vibration Distortion Removal for Scanning Probe Microscopes" with John Bruno, Don Wortman and John Bradshaw, Assigned to the US Secretary of the Army.

·  United States Provisional Patent 60/006328 "Magnetic Imaging in the Presence of an External Field"

Publications:

Book Chapter:
R.D. Gomez, “Recent Advances in Magnetic Force Microscopy: Quantification and in-situ Field Measurements” in Experimental Methods in the Physical Sciences, Vol 36, M. de Graef and Y. Zhu, editors, Academic Press 2001.

Papers:

Effects of spin polarized current through a magnetic material

 

  1. S. H. Florez, C. Krafft, and R. D. Gomez*, “Spin Current Induced Magnetization Reversal in Magnetic Nanowires with Constrictions”, Journal of Applied Physics 97, 2005, 10C705.

 

  1. M. Dreyer, J. Lee, C. Krafft and R.D. Gomez*, “(Towards) Spin polarized STM of NiFe films on Cr(001) single crystal: growth and electronic structure”, Journal of Applied Physics 97,  2005, 10E703.

 

  1. S. H. Florez, M. Dreyer, K. Schwab, C. Sanchez, and R. D. Gomez*, “Magnetoresistive effects in planar NiFe nanoconstrictions”, Journal of Applied Physics 95, 2004, 6720.

 

  1. H. Pandana, L. Gan, M. Dreyer, C. Krafft and R.D. Gomez*, “Magnetoresistance of ferromagnetic point junctions from tunneling to direct contact regimes” IEEE Transactions on Magnetics 40, no.4, pt.2, July 2004.2266-8.

 

  1. L. Gan, R. D. Gomez, C. J. Powell, R. D. McMichael, P. J. Chen, and W. F. Egelhoff, Jr., “Thin Al, Au, Cu, Ni, Fe, and Ta films as oxidation barriers for Co in air”, J. Appl. Phys., 93, (10), 2003, 8731

 

  1. S. H. Chung, M. Muñoz, N. García, W. F. Egelhoff, R. D. Gomez, “Universal scaling of magnetoconductance in magnetic nanocontacts”, J. Appl. Phys., 93, (10), 2003, 7939

 

  1. S. H. Florez and R. D. Gomez, ‘Strain-Induced Resistance Changes in CoFe/CuGMR Multilayers”, IEEE Trans. Mag., 39, (5), 2003, 3411

 

  1. S. H. Chung, M. Munoz, N. Garcia, W. F. Egelhoff, and R. D. Gomez, “Universal scaling of ballistic magnetoresistance in magnetic nanocontacts”, Phys. Rev. Lett. 89, 287203, 2002.

 

  1. H. Koo, C. Krafft, and R. D. Gomez, "Current-controlled bi-stable domain configurations in Ni81Fe19 elements: An approach to magnetic memory devices," Appl. Phys. Lett., vol. 81, pp. 862-864, 2002.

 

  1. L. Gan, S.H. Chung, K. Aschenbach, M.Dreyer and R.D. Gomez, “Pulse Current Induced Domain Wall Motion in Permalloy Films Observed Using Magnetic Force Microscopy”, IEEE Transactions on Magnetics 36, 3047-3049 (2000).

 

Manganites

 

  1. S. H. Chung, S. R. Shinde, S. B. Ogale, A. Biswas, T. Venkatesan, R. L. Greene, M. Dreyer, J.B. Dottellis, A. Millis and R. D. Gomez, “Variable temperature MFM/EFM study of  (La1-xPrx)0.67Ca0.33MnO3 Thin Films”, IEEE Transactions on 38, 2886, 2002.

 

  1. C. Kwon, S.E. Lofland, S.M. Bhagat, M. Rajeswari, T. Venkatesan, R.Ramesh, A.R. Kratz and R.D. Gomez, "Stress-induced Effects on Epitaxially Grown LSMO Metal Oxide Thin Films", J. of Mag. and Magn. Matl. 172, Aug. 1997, pp. 229-233.

 

  1. C. Kwon, S.E. Lofland, S.M. Bhagat, M. Rajeswari, T. Venkatesan, R.Ramesh, A.R. Kratz and R.D. Gomez, "Stress-Induced Surface MagnetizatiOBon of (La0.7Sr0.8)MnO3 Thin Films", IEEE Trans. on Magn. 33, Sept. 1997, pp. 3964-3966.

 

Magnetic Imaging and Innovations

 

  1. M. Dreyer, H. Pandana, and R. D. Gomez, “Scanning Tunneling Spectroscopy of Individual Iron Atoms on a Permalloy Surface”, IEEE Trans. Mag., 39, (5), 2003, 3459.

 

  1. M. Dreyer, D. G. Hwang, and R. D. Gomez, "Ultrahigh vacuum scanning tunneling microscopy/magnetic force microscopy study of ultrathin iron films grown on polycrystalline nickel oxide films", J. Appl. Phys. 91, 8138 (2002)

 

  1. M. Dreyer, C. Krafft and R. D. Gomez, "Comparison of MFM/STM data of patterned ultra thin iron films grown on Si(001), SiO2 and NiO in UHV", IEEE Trans. Mag., IEEE Trans. Magnetics 38, 2538, 2002.

 

  1. S.H. Chung, M. Dreyer, A. Shinde, S. Ogale, T. Venkatesan, R. Green and R.D. Gomez “Low temperature behavior of magnetic domains observed using magnetic force microscope”, Journal of Applied. Physics 89, 6784-6786 (2001).

 

  1. R.D. Gomez, “Recent Advances in Magnetic Force Microscopy: Quantification and in-situ Field Measurements” in Experimental Methods in the Physical Sciences, Vol 36, M. de Graef and Y. Zhu, editors, Academic Press 2001.

 

  1. M. Dreyer, R.D. Gomez, I.D. Mayergoyz, “Resolution Enhancement By Applying Magnetic Force Microscopy in UHV”, IEEE Transactions on Magnetics 36, 2975-2977 (2000).

 

  1. R.D. Gomez, A.O. Pak, A.J. Anderson, E.R. Burke, A.J. Leyendecker and I.D. Mayergoyz, "Quantification of magnetic force microscopy images using combined electrostatic and magnetostatic imaging", Journal of Applied Physics 83, 6226-6228 (1998)

 

Magnetic Nanostructures, Arrays and Films

 

  1. H. Koo, C. Krafft, and R. D. Gomez, "Inter-island Spacing and Angle Effects on Magnetic Reversal in Permalloy Arrays," IEEE Trans. 38, 2559 (2002).

 

  1. G. Gubbiotti1, G. Carlotti1, F. Albertini, F. Casoli, E. Bontempi, L. E. Depero, P. Mengucci, A. Di Cristoforo, H. Koo, R. D. Gomez,"Dependence of the perpendicular anisotropy in Co/Au multilayers on the number of repetitions," J. Appl. Phys.

 

  1. L. Gan, R.D. Gomez, A. Castillo, P.J. Chen, C.J. Powell, W.F., Jr. Egelhoff, “Ultra-thin aluminum oxide as a thermal oxidation barrier on metal films”, Thin Solid Films, 415 (1-2), 2002, 219

 

  1. G. Gubbiotti, G. Carlotti, F. Albertini, F. Casoli, E. Bontempi, L. E. Depero, P. Mengucci, A. Di  Cristoforo, H. Koo, and R. D. Gomez, “Dependence of the perpendicular anisotropy in Co/Au multilayers on the number  of  repetitions”, J. Appl. Phys. vol. 93, no. 10, pp. 7241-7243, 2003.

 

  1. G. Gubbiotti, G. Carlotti, F. Albertini, F. Casoli, E. Bontempi, L. E. Depero,  H. Koo, and R. D. Gomez, “Influence of annealing on Co/Au multilayers: structural and magnetic study”, Thin Solid Films, vol. 428, pp.102-106, 2003.

 

  1. D.G. Hwang, J.K. Kim, S.W. Kim, S.S. Lee, H. Koo, S.H. Chung, M. Dreyer, and R.D. Gomez, “Microscopic domain structures in unidirectional and isotropic exchange-coupled NiO/NiFe bilayers”, JMMM, 260, 2003, 400.

 

  1. F. Albertini, G. Carlotti, F. Casoli, G. Gubbiotti, H. Koo, and R. D. Gomez, “Magnetic properties of perpendicularly magnetized Co/Au multilayers”, Journal of Magnetism and Magnetic Materials Materials 24, 526, 2002.

 

  1. H.Koo, M. Dreyer, V.V. Methlushko and R.D. Gomez, “Investigation of the magnetic interaction of small permalloy particles”, IEEE Transactions on Magnetics, Vol. 37, 2001, 2049.

 

  1. M. Dreyer, D.G. Hwang, and R.D. Gomez, “UHV STM/MFM study of ultra thin iron films grown on polycrystalline nickel oxide films", J. Appl. Phys. 91, 8138 (2002)

 

  1. S. Ganesan, C.M. Park, K. Hattori, H.C. Park, R.L. White, H.C. Koo and R.D. Gomez, “Properties of Lithographically Formed Cobalt and Cobalt Alloy Single Crystal Patterned Media”, IEEE Transactions on Magnetics 36, 2987-2989 (2000).

 

  1. D.C. Parks, P.J. Chen, W.F. Egelhoff, Jr. and R.D. Gomez, “Interfacial roughness effects on interlayer coupling is spin valves grown on different seed layers”, Journal of Applied Physics 87 (6), 3023-3026, 15 (2000).

 

  1. H.C. Koo, T.V. Luu, V. Metlushko and R.D. Gomez, “Slow magnetization dynamics of small Permalloy  islands” Journal of Applied Physics 87 (8), 5114-5116 (2000).

 

  1. G. Gubbiotti, L. Albini, G. Carlotti, M. De Crescenzi, E. Di Fabrizio, O. Donzelli, F. Nizzoli, H.C. Koo and R.D. Gomez, “Finite size effects in patterned magnetic permalloy films”, Journal of Applied Physics 87 (8), 5633-5635, April (2000).

 

  1. R.D. Gomez, T.V. Luu, A.O. Pak, K.J. Kirk, and J.N. Chapman, "Domain configurations of Permalloy elements", J. of Applied Physics 85, 6165 (1999)

 

  1. R.D. Gomez, T.V. Luu, A.O. Pak, I.D. Mayergoyz, K.J. Kirk, and J.N. Chapman, "Domain wall motion in micron-sized Permalloy elements", J. of Applied Physics 85, 4598 (1999).

 

  1. S. Zhu, R.J. Gambino, M.H. Rafailovich, J. Sokolov, S.A. Schwarz and R.D. Gomez, "Microscopic Magnetic Characterization of Submicron Cobalt Islands Prepared Using Self-Assembled Polymer Masking Technique", IEEE Trans. on Magn. 33, Sept. 1997, pp. 3022-3024.

 

  1. R.D. Gomez, M.C. Shih, R.M.H. New, R.F.W. Pease and R.L. White, "Switching characteristics of sub-micron cobalt islands", J. of Applied Physics 80, 6441-6446 (1996).

 

Magnetic Recording Imaging, Erasure and Data Security

 

  1. I.D. Mayergoyz, C. Tse, C. Krafft, and R.D. Gomez, "Spin-stand imaging of overwritten data and its comparison with magnetic force microscopy", Journal of Applied Physics 89, 6772-6774 (2001).

 

  1. R. Madabhushi, R.D. Gomez, E.R. Burke, I.D. Mayergoyz, and J. Orloff, "Inter-track Interference Studies Using MFM Image Reconstruction", IEEE Trans. on Magn. 33, Sept. 1997, pp. 4053-4055.

 

  1. I.D. Mayergoyz, R. Madabhushi, E.R. Burke, and R.D. Gomez, "Analytical solution for the side-fringing fields of narrow beveled heads", J. Appl. Phys. 81, 4850 (1997).

 

  1. R.D. Gomez, E.R. Burke and I.D. Mayergoyz, "Magnetic Imaging in the Presence of an External Field: Technique and Applications (INVITED)", Journal of Applied Physics 79, 6441-6446 (1996).

 

  1. J.A. Cannon, E.R. Burke, R.D. Gomez, R. Madabhushi and I.D. Mayergoyz, "Distortion of Inductive Read Head Signal Due to Side-Written Magnetization", IEEE Trans. on Magnetics 32, 5265 (1996).

 

  1. R. Madabhushi, R.D. Gomez, E.R. Burke and I.D. Mayergoyz, "Magnetic Biasing and MFM Image Reconstruction", IEEE Trans. on Magnetics 32, 4147 (1996).

 

  1. R.D. Gomez, A.R. Kratz, I.D. Mayergoyz and E.R. Burke,"Microscopic Observations of Domain Collapse in TbFeCo-based Magneto-Optic Recording", Proceedings: SPIE Proceedings: Optical Data Storage 2514, 191-199, 1995.

 

  1. R.D. Gomez, I.D. Mayergoyz and E.R. Burke, "Magnetic Imaging in the Presence of an External Field: Erasure Process of Thin-Film Recording Medium", IEEE Transactions on Magnetics 31, 3346 (1995).

 

  1. R.D. Gomez, A.R. Kratz, E.R. Burke and I.D. Mayergoyz, "Spatially- Resolved Magnetic Imaging of Magneto-Optic Recording", IEEE Transactions on Magnetics 32, 3265 (1995).

 

  1. R.D. Gomez, R. Madabhushi, I.D. Mayergoyz, L. Lising and E.R. Burke, "Microscopic imaging of recorded patterns subjected to external DC erasing field", Journal of Magnetism and Magnetic Materials 148, 446-454 (1995).

 

  1. R.D. Gomez, E.R. Burke and I.D. Mayergoyz, "Direct imaging of track edge fringing fields on recorded media", Journal of Applied Physics 75 (10), 5756 (1994).

 

  1. E.R. Burke, R.D. Gomez, R. Madabhushi and I.D. Mayergoyz, "Calculation of Head Sensitivity Function from 3-D Magnetic Fields", IEEE Transactions on Magnetics 30, 4278 (1994).

 

  1. E.R. Burke, R.D. Gomez and I.D. Mayergoyz, "Computation of magnetic fields from recording surfaces with multiple tracks", Journal of Applied Physics 75(10), 5759 (1994).

 

  1. R.D. Gomez, A.A. Adly, I.D. Mayergoyz, and E.R. Burke, "Magnetic force scanning tunneling microscopy: theory and experiment (invited)", IEEETransactions on Magnetics, 29, 2494 (1993).

 

  1. A.A. Adly, I.D. Mayergoyz, R.D. Gomez and E.R. Burke, "Computation of magnetic fields in hysteretic media and its application to magnetic recording", IEEE Transactions on Magnetics, 29, 2380 (1993).

 

  1. R.D. Gomez, E.R. Burke, A.A. Adly, I.D. Mayergoyz, J. Gorczyca and M.H. Kryder,"Microscopic investigations of overwritten data", Journal of Applied Physics 73 (10), 6001 (1993).

 

  1. R.D. Gomez, E.R. Burke, A.A. Adly, I.D. Mayergoyz, J. Gorczyca and M.H. Kryder, "Magnetic force scanning tunneling microscopy of high density recording", Journal of Applied Physics 73 (10), 6180 (1993).

 

  1. R.D. Gomez, E.R. Burke, A.A. Adly and I.D. Mayergoyz,"Magnetic Force STM Imaging of Overwritten Data", IEEE Transactions on Magnetics, 28, 3141, Sept. 1992.

 

Magnetic Force Scanning Tunneling Microscope

 

  1. E.R. Burke, R.D. Gomez, and I.D. Mayergoyz, "Analysis of 3-D Magnetic Fields Measured Using a Magnetic Force Scanning Tunneling Microscope", IEEE Transactions on Magnetics 30, 4488 (1994).

 

  1. R.D. Gomez, E.R. Burke and I.D. Mayergoyz,"Component resolved imaging of surface magnetic fields", Journal of Applied Physics 75 (10),5910 (1994).

 

  1. I.D. Mayergoyz, A.A. Adly, R.D. Gomez and E.R. Burke,"Magnetization image reconstruction from magnetic force scanning tunneling microscopy images", Journal of Applied Physics 73 (10), 5799 (1993).

 

  1. I.D. Mayergoyz, A.A. Adly, R.D. Gomez and E.R. Burke, "Experimental verification of the point charge model of magnetic force scanning tunneling microscopy ", Journal of Applied Physics 73 (10), 5796 (1993).

 

  1. R.D. Gomez, A.A. Adly, E.R. Burke, and I.D. Mayergoyz, "Magnetic Field Imaging by Using Magnetic Force Scanning Tunneling Microscopy", Applied Physics Letters 60, 906 (1992).

 

  1. E.R. Burke, R.D. Gomez, A.A. Adly and I.D. Mayergoyz."Magnetic scanning tunneling microscopy: theory and experiment", Proceedings of OE LASE '93 Conference, Jan. 16-23,1993, LA, California, Intl. Soc. of Optical Engineering.

 

  1. E.R. Burke, R.D. Gomez, A.A. Adly and I.D. Mayergoyz. "Magnetic force scanning tunneling microscopy", Proceedings of Technology 2002 Conference, Dec 1-4, 1992, Baltimore, MD, sponsored by NASA.

 

  1. E.R. Burke, R.D. Gomez, A.A. Adly and I.D. Mayergoyz,"Analysis of Tunneling Magnetic Force Microscopy Using a Flexible Triangular Probe", IEEE Transactions on Magnetics, 28, 3135, Sept. 1992.

 

Other Topics

 

  1. R.D. Whaley, B. Gopalan, M. Dagenais, F.G. Johnson, S. Agarwala, O. King, D.R. Stone and R.D. Gomez, "Use of atomic force microscopy for analysis of high performance InGaAs/InP semiconductor lasers with dry-etched facets", Journal of Vacuum Science and Technology B 16, 1007-1011 (1998)

 

  1. V. Strom, R.D. Gomez, J. Nogues, B. Rodell and K.V. Rao, "Inexpensive high-voltage low-current amplifier for driving long- range scanning tunneling microscope piezoactuators", Meas. Sci. Technol. 6, 1072 (1995).

 

  1. R.D. Gomez and E.D. Williams, "Appearance Potential Study of Barium-Activated Oxidation of Ni",Surface Science 206, 289, 1988.

 

  1. T.S. Stein, W.E. Kauppila, R.D. Gomez, K.Ch.Kwan and H. Yan, "Total cross-cection measurements for positrons and electrons colliding with potassium",Physical Review Letters 55, 488,1985.

 

  1. T.S. Stein, W.E. Kauppila, K. Ch. Kwan, R.D. Gomez and H. Yan."Positron and Electron - Alkali (K and Na) Total Qt Measurements, Electronic and Atomic Collisions, 14th International Conference, Amsterdam, Netherlands, 1985.

Invited Talks:

·  Tutorial on Recent Advances in Magnetic Force Microscopy, Centennial March Meeting of the American Physical Society, Atlanta, GA (March 21, 1999).

·  “Recent Advances in Magnetic Force Microscopy”, Microscopy and Microanalysis ’99 Conference, Portland, OR (August 1-5, 1999).

·  “Magnetic Imaging and Applications to Nanostructures”, Physics Colloquium, Wayne State University, Detroit, Michigan (March 11, 1999).

·  "Magnetic force microscopy: current status and future trends", Symposium on Microstructure and Microscopy, Iowa State University, (May 13-15, 1998).

·  "Magnetic force microscopy in the presence of an external field: technique and applications (invited)", 40th Annual Conference on Magnetism and Magnetic Materials, Philadelphia, PA, USA (Nov. 6-9,1995).

·  "Magnetic force scanning tunneling microscopy: theory and experiment (invited)", IEEE Intermag '93, Stockholm, Sweden, (Apr. 13-16, 1993).

·  "Magnetic Force Scanning Tunneling Microscopy", IBM Zurich Ruschlikon Research Center,  Zurich, SWITZERLAND, (Oct. 2, 1992).

·  "Magnetic Force Scanning Tunneling Microscopy of Thin Film Magnetic Recording Media", Physics Department, University of Uppsala, Uppsala, Sweden, (Sept. 10, 1992).

Ph.D. Thesis Research Work:

Prof. E.D. Williams, advisor
Design and construction of an ultra high vacuum scanning tunneling microscope, including mechanical, electronics, computer-interfacing design and fabrication. Subsequent measurements of graphite and silicon surfaces with atomic resolution. Investigation o f facetting behavior of Si(111) surfaces misoriented along the [211] direction.

Current Research Areas:

Areas of interests and expertise include: magnetic imaging , fundamental characterization of surface magnetism, magnetic recording, electromagnetic properties of materials, proximal probe microscopy such as scanning tunneling/ atomic force microscopy, and thermodynamics of solid surfaces.  Development and introduction of the magnetic microscopy techniques to image surface magnetization patterns with ten nanometer spatial resolution, studies on fundamental micromagnetic characteristics of magnetic recording media. Recent efforts include (i) spatially resolved spatial mapping of individual vector components of surface magnetic fields, (ii) studies of the mechanisms of erasure on thin film and magneto-optic media, (iii) characterization of transverse field contributions on data recording, (iv) establishment of criteria on retrievability and security of overwritten data, (iv) experimental and theoretical modeling studies of high density recording, (iv) development of theoretical models and experimental implementation of magnetic force in the presence of external magnetic fields. Current work involves the development of novel applications of magnetic microscopy techniques such as field-dependent and temperature dependent imaging, fundamental micromagnetic characterization of of technologically important magnetic materials, modeling of contrast formation in magnetic microscopy, studies of the evolution of micromagnetic structures. Collaborative efforts underway with various government laboratories, industrial companies and universities involving giant magneto-resistance in metal oxide, spin valve multilayer structures, switching behavior of sub micron patterns magnetic islands, magneto-optic recording materials. Other work involve the development of theoretical models and experimental assessments of erased data recovery in magnetic recording systems. Microscopic characterization (topographical and magnetic) of epitaxially grown films, GMR and CMR materials, nanostructures and biological materials. Biographical Sketch in Who's Who in Science and Engineering