Research Associate Professor

Department of Physics and Astronomy
156 Behlen Laboratory
Phone: (402) 472-0180
Email: rskomski2@unl.edu

The research of Ralph Skomski focuses on theory of magnetic nanostructures. The main aim is to model the behavior of nanostructures and to make predictions about conceivable but difficult-to-produce materials. The relevant length scales of the involved structural features vary from a few interatomic distances to more than 100 nm, and each length scale has its own characteristics. Examples of small-scale magnetic nanostructures of interest are nanotubes, nanorings, patterned thin films, and particulate materials. These structures exhibit, among other features, interesting spin-wave and magnetization-reversal modes. On an atomic scale, chemical substitutions, interstitial modification, and changes in the crystal structure are exploited to tailor intrinsic properties such as anisotropy, Curie temperature and magnetic moment. On length scales larger than a few nm, the magnetic material can be treated as a continuum. In this regime, the atomic properties enter the consideration as micromagnetic parameters. The morphological peculiarities of magnetic nanostructures lead to a variety of novel micromagnetic effects. One example is intergranular exchange coupling, which has a strong effect on the performance of advanced permanent magnets, magnetic recording media, and magnetoresistive materials.

Other research areas of interest are time-dependent magnetization processes (magnetic viscosity and fast processes), the spin structure of half-metallic ferromagnets as well as topics such as RKKY interactions between nanomagnets embedded in a nonmagnetic metallic matrix. Emphasis is on analytic models, which are designed to complement and guide other scientists' numerical approaches, such as band-structure calculations.

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2014

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Magnetic properties of Fe-doped MnAl, Priyanka Manchanda, Arti Kashyap, Jeffrey E. Shield, L. H. Lewis, and Ralph Skomski

2013

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Hf Doping Effect on Hard Magnetism of Nanocrystalline Zr18-x HfxCo82 Ribbons, Imaddin Ali Al-Omari, W.Y. Zhang, Lanping Yue, Ralph Skomski, Jeffrey Shield, Xingzhong Li, and David J. Sellmyer

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HfCo7-Based Rare-Earth-Free Permanent-Magnet Alloys, B. Das, B. Balamurugan, Pankaj Kumar, Ralph Skomski, V.R. Shah, Jeffrey Shield, Arti Kashyap, and David J. Sellmyer

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Structure and magnetism of dilute Co(Zr) nanoclusters, B. S. Das, B. Balamurugan, Ralph Skomski, X. Z. Li, P. Mukherjee, G. C. Hadjipanayis, and David J. Sellmyer

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Magnetic and Structural Properties of Rapidly Quenched Tetragonal Mn3-x Ga Nanostructures, Y. Huh, Parashu Kharel, V.R. Shah, E. Krage, Ralph Skomski, Jeffrey Shield, and David J. Sellmyer

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Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures, Y. Huh, Parashu Kharel, V.R. Shah, XINGZHONG LI, Ralph Skomski, and David J. Sellmyer

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Magnetism of MnBi-Based Nanomaterials, Parashu Kharel, V.R. Shah, Ralph Skomski, Jeffrey Shield, and David J. Sellmyer

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Magnetic phases of cobalt atomic clusters on tungsten, Pavel V. Lukashev, Ji-Hyun Kim, Seolum Yang, Jae-Sung Kim, Xumin Chen, Geoffrey Rojas, Jan Honolka, Ralph Skomski, Axel Enders, and Renat F. Sabirianov

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Intrinsic Properties of Fe-Substituted L10Magnets, P Manchanda, Pankaj Kumar, Arti Kashyap, M. J. Lucis, Jeffrey E. Shield, A. Mubarok, J. I. Goldstein, S. Constantinides, K. Barmak, L.H. Lewis, David J. Sellmyer, and Ralph Skomski

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Ab-initio study of free standing TiO2 clusters: Stability and magnetism, T.H. Rana, Pankaj Kumar, Ashok K. Solanki, Ralph Skomski, and Arti Kashyap

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Finite-Temperature Micromagnetism, Ralph Skomski, Pankaj Kumar, G. C. Hadjipanayis, and David J. Sellmyer

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Predicting the Future of Permanent-Magnet Materials, Ralph Skomski, Priyanka Manchanda, Pankaj Kumar, B. Balamurugan, Arti Kashyap, and David J. Sellmyer

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Room-temperature organic ferromagnetism in the crystalline poly(3-hexylthiophene): Phenyl-C61-butyric acid methyl ester blend film, Bin Yang, Zhengguo Xiao, Yongbo Yuan, Tanjore V. Jayaraman, Jeffrey E. Shield, Ralph Skomski, and Jinsong Huang

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Susceptibility of Fe atoms in Cu clusters, Rui Zhang, Tom A. George, Parashu Kharel, Ralph Skomski, and David J. Sellmyer

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Magnetism of Rapidly Quenched Sm1-xZrxCo5 Nanocrystalline Materials, W. Y. Zhang, Shah R. Valloppilly, Xing Zhong LI, Yi Liu, Steven A. Michalski, Thomas A. George, Ralph Skomski, Jeffrey Shield, and David J. Sellmyer

2012

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Magnetic Properties of Y3−2xCa2xFe5−xVxO12 Garnets, Imaddin Ali Al-Omari, Ralph Skomski, and David J. Sellmyer

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Assembly of uniaxially aligned rare-earth-free nanomagnets, B. Balamurugan, B. Das, V. R. Shah, Ralph Skomski, X. Z. Li, and David J. Sellmyer

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Prospects for nanoparticle-based permanent magnets, B. Balamurugan, David J. Sellmyer, G. C. Hadjipanayis, and Ralph Skomski

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Magnetism of directly ordered Sm-Co clusters, Balamurugan Balasubramanian, Ralph Skomski, Xingzhong Li, G. C. Hadjipanayis, and David J. Sellmyer

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Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters, Balamurugan Balasubramanian, Ralph Skomski, Xingzhong Li, Shah R. V, P Manchanda, Arti Kashyap, and David J. Sellmyer

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Magnetism of Less Common Cobalt-Rich Alloys, B. Das, B. Balamurugan, W. Y. Zhang, Ralph Skomski, E. Krage, Shah R. Valloppilly, Jeffrey Shield, and David J. Sellmyer

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Structure and magnetic properties of Co-W clusters produced by inert gas condensation, Farhad Reza Golkar-Fard, M. J. Kramer, Y. Zhang, R. W. McCallum, Ralph Skomski, David J. Sellmyer, and Jeffrey E. Shield

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Structural and magnetic properties of Mn2 +δTiSn, Parashu Kharel, Y. Huh, V. R. Shah, X. Z. Li, N. Al-Agtash, K. Tarawneh, E. S. Krage, Renat F. Sabirianov, Ralph Skomski, and David J. Sellmyer

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Structural, magnetic, and electron transport properties of MnBi:Fe thin films, Parashu Kharel, X. Z. Li, V. R. Shah, N. Al-Aqtash, K. Tarawneh, Renat F. Sabirianov, Ralph Skomski, and David J. Sellmyer

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Magnetism and structure of anatase (Ti1-xVx)O2 films, D. Le Roy, Shah R. Valloppilly, Ralph Skomski, Sy-Hwang Liou, and David J. Sellmyer

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Aligned and exchange-coupled L10 (Fe,Co)Pt-based magnetic films, Yi Liu, Thomas A. George, Ralph Skomski, and David J. Sellmyer

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One-step fabrication of L10 FePt nanocubes and rods by cluster beam deposition, W Li, O Akdogan, G. C. Hadjipanayis, Ralph Skomski, and David J. Sellmyer

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Intrinsic Magnetic Properties of L10-Based Mn-Al and Fe-Co-Pt Alloys, P. Manchanda, Ralph Skomski, Jeffrey Shield, S. Constantinides, and Arti Kashyap

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Isothermal entropy changes in nanocomposite Co:Ni67Cu33, Steven A. Michalski, Ralph Skomski, X.-Zh. Li, D. Le Roy, T. Mukherjee, Christian Binek, and David J. Sellmyer

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Spin and elastic contributions to isothermal entropy change, T. Mukherjee, Ralph Skomski, Steven A. Michalski, David J. Sellmyer, and Christian Binek

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Ultrahard magnetic nanostructures, P. K. Sahota, Yi Liu, Ralph Skomski, Priyanka Manchanda, R. Zhang, M. Franchin, H. Fangohr, G. C. Hadjipanayis, A. Kashyap, and David J. Sellmyer

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Interatomic exchange in Mn-doped III–V semiconductors, Vinit Sharma, Priyanka Manchanda, Pankaj Sahota, Ralph Skomski, and Arti Kashyap

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Berry phase from a randomly fluctuating magnetic field, Ralph Skomski

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Hysteresis and relaxation in granular permanent magnets, Ralph Skomski, B. Balamurugan, Thomas A. George, Mircea Chipara, Xiao-Hui Wei, Jeffrey E. Shield, and David J. Sellmyer

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A quantum-mechanical relaxation model, Ralph Skomski, A Kashyap, and David J. Sellmyer

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Nanomagnetic skyrmions, Ralph Skomski, Zhen Li, Rui Zhang, Roger D. Kirby, Axel Enders, Daniel Schmidt, T. Hofmann, Eva Schubert, and David J. Sellmyer

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Experimental and theoretical studies of hydroxyl-induced magnetism in TiO nanoclusters, Xiao-Hui Wei, Rulong Zhou, B. Balamurugan, Ralph Skomski, Xiao Cheng Zeng, and David J. Sellmyer

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L10 CrPt phase formation and magnetic properties, Rui Zhang, Ralph Skomski, Xingzhong Li, Zhen Li, Priyanka Manchanda, Arti Kashyap, Roger D. Kirby, Sy-Hwang Liou, and David J. Sellmyer

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Coercivity Enhancement in Zr2Co11-Based Nanocrystalline Materials Due to Mo Addition, Wenyong Zhang, Shah R. Valloppilly, XINGZHONG LI, Ralph Skomski, Jeffrey E. Shield, and David J. Sellmyer

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Coercivity Enhancement in Zr2Co11-Based Nanocrystalline Materials Due to Mo Addition, Wenyong Zhang, Shah R. Valloppilly, Xingzhong Li, Ralph Skomski, Jeffrey Shield, and David J. Sellmyer

2011

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Ultrathin BaTiO3 templates for multiferroic nanostructures, Xumen Chen, Seolun Yang, Ji-Hyun Kim, Hyung-Do Kim, Jae-Sung Kim, Geoffrey Rojas, Ralph Skomski, Haidong Lu, Anand Bhattacharya, Tiffany Santos, Nathan Guisinger, Matthias Bode, Alexei Gruverman, and Axel Enders

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THz dielectric anisotropy of metal slanted columnar thin films, T. Hofmann, D. Schmidt, A. Boosalis, P. Kuhne, Ralph Skomski, C. M. Herzinger, J. A. Woollam, Mathias Schubert, and E. Schubert

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Anisotropy of W in Fe and Co, Arti Kashyap, P Manchanda, P. K. Sahota, Ralph Skomski, Jeffrey Shield, and David J. Sellmyer

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Spin correlations and Kondo effect in a strong ferromagnet, Parashu Kharel, Ralph Skomski, Pavel Lukashev, Renat F. Sabirianov, and David J. Sellmyer

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Aligned and exchange-coupled FePt-based films, Y. Liu, Thomas A. George, Ralph Skomski, and David J. Sellmyer

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Magnetoelectric Effect in L10-CoPd Thin Films, P Manchanda, Ralph Skomski, A. Solanki, P. S. A. Kumar, and Arti Kashyap

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Magnetic entropy changes in nanogranular Fe:Ni61Cu39, Steven A. Michalski, Ralph A. Skomski, Tathagata Mukherjee, Xingzhong Li, Christian Binek, and David J. Sellmyer

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Magnetic entropy changes in nanogranular Fe:Ni61Cu39, Steven A. Michalski, Ralph Skomski, T. Mukherjee, X. Z. Li, Christian Binek, and David J. Sellmyer

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Overcoming the spin-multiplicity limit of entropy by means of lattice degrees of freedom: A minimal model, T. Mukherjee, Steven A. Michalski, Ralph Skomski, David J. Sellmyer, and Christian Binek

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Anisotropy of zigzag chains of palladium, P. K. Sahota, Ralph Skomski, Axel Enders, David J. Sellmyer, and Arti Kashyap

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Are there superspin glasses?, Ralph Skomski

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Length scales of interactions in magnetic, dielectric, and mechanical nanocomposites, Ralph Skomski, B. Balamurugan, E. Schubert, Axel Enders, and David J. Sellmyer

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Is the magnetic anisotropy proportional to the orbital moment?, Ralph Skomski, Arti Kashyap, and Axel Enders

2010

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Interstitial-nitrogen effect on phase transition and magnetocaloric effect in Mn(As,Si) (invited), W. B. Cui, X. K. Lv, F. Yang, Ralph Skomski, Y. Yu, X. G. Zhao, W. Liu, and Z.D. Zhang

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Magnetic surface nanostructures, Axel Enders, Ralph A. Skomski, and J. Honolka

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Permittivity and permeability of Fe(Tb) nanoparticles and their microwave absorption in the 2–18 GHz range, Z. Han, D. Li, M. Tong, X. Wei, Ralph Skomski, W. Liu, Z. D. Zhang, and David J. Sellmyer

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Structural, magnetic and magneto-transport properties of Pt-alloyed MnBi thin films, Parashu Kharel, Ralph Skomski, Roger D. Kirby, and David J. Sellmyer

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Magnetic antiphase domains in Co/Ru/Co trilayers, Zhen Li; Ralph Skomski; Steven Michalski; Lanping Yue,2 and Roger D. Kirbyng; and Roger D. Kirby

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Entropy localization in magnetic compounds and thin-film nanostructures, Ralph Skomski, Christian Binek, S. Michalski, T. Mukherjee, Axel Enders, and David J. Sellmyer

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Magnetic anisotropy in itinerant magnets, Ralph Skomski, A. Kashyap, A. Solanki, Axel Enders, and David J. Sellmyer

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Permanent magnetism of dense-packed nanostructures, Ralph Skomski, Yi Liu, Jeffrey Shield, G. C. Hadjipanayis, and David J. Sellmyer

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Magnetic susceptibility of nanoscale Kondo systems, Ralph Skomski, R. Zhang, P. Kharel, Axel Enders, Sy_Hwang Liou, and D. J. Sellmeyer

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Magnetism of core-shell Ti:TiO nanoparticles, Xiaohui Wei, Ralph Skomski, Balamurugan Balasubramanian, and David J. Sellmyer

2009

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Magnetism of Cr-Doped Diamond-Like Carbon, J. A. Colón Santana, Ralph Skomski, V. Singh, V. Palshin, A. Petukhov, Ya. B. Losovyj, Andrei Sokolov, Peter Dowben, and Ihor Ketsman

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Magnetic Correlations in Nanocomposite FePt:Au and FePt:C Films, Thomas A. George, Ralph Skomski, and David J. Sellmyer

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Magnetism of FePt Surface Alloys, J. Honolka, T. Y. Lee, K. Kuhnke, Axel Enders, Ralph Skomski, S. Bornemann, S. Mankovsky, J. Minar, J. Staunton, H. Ebert, M. Hessler, K. Fauth, G. Schutz, A. Buchsbaum, M. Schmid, P. Varga, and K. Kern

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Magnetocaloric properties of Co/Cr superlattices, T. Mukherjee, Sarbeswar Sahoo, Ralph Skomski, David J. Sellmyer, and Christian Binek

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Optical, structural, and magnetic properties of cobalt nanostructure thin films, D. Schmidt, A. C. Kjerstad, Tino Hofmann, Ralph Skomski, Eva Schubert, and Mathias Schubert

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Graded Permanent Magnets, Ralph Skomski, J. Hadjipanayis, and David J. Sellmyer

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Dzyaloshinski–Moriya Micromagnetics of Magnetic Surface Alloys, Ralph Skomski, J. Honolka, S. Bornermann, H. Ebert, and Axel Enders

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Magnetism of TiO and TiO2 Nanoclusters, Xiaohui Wei, Ralph Skomski, Balamurugan Balasubramanian, Z. G. Sun, Stephen Ducharme, and David J. Sellmyer

2008

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The local environment of Co in B5CHx, Peter Dowben, A. Yu. Ignatov, Jing Lui, and Ralph Skomski

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Nanostructure and magnetic properties of L10 FePt:X films, Thomas A. George, Zhen Li, Minglang Yan, Yingfan Xu, Ralph Skomski, and David Sellmyer

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Temperature dependence of half-metallic hybridization gaps, Ralph Skomski

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Temperature- and field-induced entropy changes in nanomagnets, Ralph Skomski, Christian Binek, T. Mukherjee, Sarbeswar Sahoo, and David J. Sellmyer

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Nucleation and wall motion in graded media, Ralph Skomski, Thomas A. George, and David J. Sellmyer

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Hysteresis of ultrasmall Fe–Pt particles, Ralph Skomski, J. P. Liu, C. B. Rong, and David J. Sellmyer

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Band-structure and correlation effects in the Co(111) planes of CoO, Ralph Skomski, Xiaohui Wei, and David J. Sellmyer

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Substrate-controlled growth and magnetism of nanosize Fe clusters on Pt, Ralph Skomski, J. Zhang, V. Sessi, J. Honolka, K. Kern, and Axel Enders

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Proteresis in Co:CoO core-shell nanoclusters, X.-H. Wei, Ralph Skomski, Zhiguang Sun, and David Sellmyer

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Ordered Layers of Co Clusters on BN Template Layers, J. Zhang, V. Sessi, C. H. MIchaelis, I. Brihuega, J. Honolka, K. Kern, Ralph Skomski, X. Chen, G. Rojas, and Axel Enders

2007

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Electrodeposition and Magnetic Properties of Polypyrrole-Fe Nanocomposites, Mircea Chipara, Ralph Skomski, and David J. Sellmyer

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Coupled precession modes in indirect exchange-coupled [Pt/Co]–Co thin films, Steven Michalski, Jian Zhou, Ralph Skomski, and Roger D. Kirby

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Surface anisotropy and magnetic freezing of MnO nanoparticles, Marco Morales Torres, Ralph Skomski, Shannon Fritz, G. Shelburne, Jeffrey E. Shield, Ming Yin, Stephen O'Brien, and Diandra Leslie-Pelecky

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Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles, Chuan-bing Rong, Narayan Poudyal, Girija S. Chaubey, Vikas Nandwana, Ralph Skomski, Y. Q. Wu, M. J. Kramer, and J. Ping Liu

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Finite-temperature depolarization in half metals, Ralph Skomski

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Phase formation in L1 0 magnets, Ralph Skomski

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Role of thermodynamic fluctuations in magnetic recording (invited), Ralph Skomski

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Effective Demagnetizing Factors of Complicated Particle Mixtures, Ralph Skomski, G. C. Hadjipanayis, and David J. Sellmyer

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Magnetic impurities in magic-number clusters, Ralph Skomski and David J. Sellmyer

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Magnetization Reversal in Cubic Nanoparticles With Uniaxial Surface Anisotropy, Ralph Skomski, Xiao-Hui Wei, and David J. Sellmyer

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Continuous/Cluster-Pinned Recording Media, Ralph Skomski, M. L. Yan, Yinfan Xu, and David J. Sellmyer

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Temperature-dependent orbital-moment anisotropy in dilute magnetic oxides, Jun Zhang, Ralph Skomski, Yongfeng Lu, and David J. Sellmyer

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Structure and magnetism of V-doped SnO2 thin films: effect of the substrate, Jun Zhang, Ralph Skomski, L. P. Yue, Yongfeng Lu, and David J. Sellmyer

2006

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"Introduction" to Advanced Magnetic Nanostructures, David J. Sellmyer and Ralph Skomski

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Magnetic Materials (Appendix to Advanced Magnetic Nanostructures [2006]), David J. Sellmyer and Ralph Skomski

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"Preface" to Advanced Magnetic Nanostructures, David J. Sellmyer and Ralph Skomski

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Assembly of high-anisotropy L10 FePt nanocomposite films, David J. Sellmyer, Yinfan Xu, M. L. Yan, Yucheng Sui, Jian Zhou, and Ralph Skomski

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Magnetic reversal in three-dimensional exchange-spring permanent magnets, Jeffrey E. Shield, J. Zhou, S. Aich, V.K. Ravindran, Ralph Skomski, and David J. Sellmyer

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Finite-temperature anisotropy of magnetic alloys, Ralph Skomski, O.N. Mryasov, J. Zhou, and David J. Sellmyer