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.

Follow

2006

PDF

Magnetic Aging, Ralph Skomski, Jian Zhou, Roger D. Kirby, and David J. Sellmyer

PDF

Micromagnetic energy barriers, Ralph Skomski, Jian Zhou, Roger D. Kirby, and David J. Sellmyer

PDF

Indirect exchange in dilute magnetic semiconductors, Ralph Skomski, J. Zhou, Jun Zhang, and David J. Sellmyer

PDF

Fast and Slow Magnetization Processes in Magnetic Recording Media, Jian Zhou, Ralph Skomski, Steven A. Michalski, Roger D. Kirby, and David J. Sellmyer

PDF

Structural effects on exchange in nanocluster perpendicular recording media, J. Zhou, Ralph Skomski, and David J. Sellmyer

2005

PDF

Enhanced coercivity in thermally processed (Nd,Dy)(Fe,Co,Nb,B) 5.5/ α-Fe nanoscale multilayer magnets, W. Liu, X.Z. Li, J.P. Liu, X.K. Sun, C.L. Chen, Ralph Skomski, Z.D. Zhang, and David J. Sellmyer

PDF

Phase transformations and thermodynamic properties of nanocrystalline FePt powders , J. Lyubina, O. Gutfleisch, Ralph Skomski, K.-H. Müller, and L. Schultz

PDF

Nanomagnetic Structures: Fabrication and Interactions, David J. Sellmyer, Y. C. Sui, Yinfan Xu, M. L. Yan, K. D. Sorge, and Ralph Skomski

PDF

High-Anisotropy Nanocluster Films for High-Density Perpendicular Recording, David J. Sellmyer, Minglang Yan, Yinfan Xu, and Ralph Skomski

PDF

Intra-atomic aspects of magnon-plasmon interactions, Ralph Skomski and Peter A. Dowben

PDF

Atomic and micromagnetic aspects of L10 magnetism, Ralph Skomski, Arti Kashyap, and Jian Zhou

PDF

Anisotropic exchange, Ralph Skomski, A. Kashyap, Jian Zhou, and David J. Sellmyer

PDF

Magnetic materials for finite-temperature quantum computing, Ralph Skomski, J. Zhou, A.Y. Istomin, Anthony F. Starace, and David J. Sellmyer

PDF

Relaxation in magnetic nanostructures, Ralph Skomski, J. Zhou, and David J. Sellmyer

PDF

Geometry and magnetism of L10 nanostructures, Kory D. Sorge, Ralph Skomski, Maria Daniil, Steven Michalski, L. Gao, Jian Zhou, M. Yan, Yucheng Sui, Roger D. Kirby, Sy_Hwang Liou, and David J. Sellmyer

PDF

Template-mediated assembly of FePt L10 clusters under external magnetic field, Yucheng Sui, W. Liu, L.P. Yue, X.Z. Li, J. Zhou, Ralph Skomski, and David J. Sellmyer

PDF

Magnetic properties and L10 phase formation of FePt films prepared by high current-density ion-beam irradiation and rapid thermal annealing methods, T. Yokota, M.L. Yan, Yinfan Xu, L. Gao, R. Zhang, LeighAnn Nicholl, Lu Yuan, Ralph Skomski, David J. Sellmyer, Sy_Hwang Liou, Chih-Huang Lai, Cheng-Han Yang, and Sheng-Huang Huang

PDF

Sample preparation and annealing effects on the ferromagnetism in Mn-doped ZnO, Jun Zhang, Ralph Skomski, and David J. Sellmyer

PDF

Highly coercive thin-film nanostructures, Jian Zhou, Ralph Skomski, Arti Kashyap, Kory D. Sorge, Yucheng Sui, Maria Daniil, L. Gao, M. L. Yan, Sy_Hwang Liou, Roger D. Kirby, and David J. Sellmyer

PDF

Magnetization reversal in particulate L10 nanostructures, Jian Zhou, Ralph Skomski, Kory D. Sorge, and David J. Sellmyer

PDF

Rapidly annealed exchange-coupled Sm-Co/Co multilayers, J. Zhou, Ralph Skomski, Yi Liu, Yucheng Sui, W. Liu, and David J. Sellmyer

2004

PDF

Field-controlled domain-wall resistance in magnetic nanojunctions, J. D. Burton, A. Kashyap, Mikhail Ye. Zhuravlev, Ralph Skomski, Evgeny Y. Tsymbal, Sitaram Jaswal, O.N. Mryasov, and R.W. Chantrell

PDF

Are half-metallic ferromagnets half metals? (invited), Peter A. Dowben and Ralph Skomski

PDF

Focused Ion Beam Milled CoPt Magnetic Force Microscopy Tips for High Resolution Domain Images, L. Gao, L. P. Yue, T. Yokota, Ralph Skomski, Sy-Hwang Liou, H. Takahoshi, H. Saito, and S. Ishio

PDF

Magnetism of L10 compounds with the composition MT (M = Rh, Pd, Pt, Ir and T = Mn, Fe, Co, Ni), A. Kashyap, Ralph Skomski, Ashok K. Solanki, Yinfan Xu, and David J. Sellmyer

PDF

First principles study of transition-metal substitutions in Sm–Co permanent magnets, R.F. Sabirianov, A. Kashyap, Ralph Skomski, Sitaram Jaswal, and David J. Sellmyer

PDF

Quantum entanglement of anisotropic magnetic nanodots, Ralph Skomski, Andrei Y. Istomin, Anthony F. Starace, and David J. Sellmyer

PDF

Quantum entanglement of anisotropic magnetic nanodots, Ralph Skomski, Andrei Y. Istomin, Anthony F. Starace, and David J. Sellmyer

PDF

Multidomain and incoherent effects in magnetic nanodots, Ralph Skomski, A. Kashyap, Kory D. Sorge, and David J. Sellmyer

PDF

Noncollinear spin states and competing interactions in half-metals, Ralph Skomski, Jian Zhou, Peter A. Dowben, and David J. Sellmyer

PDF

Domain-Wall Pinning at Inhomogenities of Arbitrary Cross-Sectional Geometry, Ralph Skomski, Jian Zhou, Arti Kashyap, and David J. Sellmyer

PDF

Interactions and switching behavior of anisotropic magnetic dots, Kory D. Sorge, A. Kashyap, Ralph Skomski, Lanping Yue, L. Gao, Roger D. Kirby, Sy_Hwang Liou, and David J. Sellmyer

PDF

Magnetic nanotubes produced by hydrogen reduction, Yucheng Sui, Ralph Skomski, Kory D. Sorge, and David J. Sellmyer

PDF

Nanotube magnetism, Yucheng Sui, Ralph Skomski, Kory D. Sorge, and David J. Sellmyer

PDF

Growth and magnetism of FePt:C composites in nanoscale channels, Yucheng Sui, J. Zhou, X.Z. Li, Ralph Skomski, and David J. Sellmyer

PDF

Hysteresis of Granular FePt:Ag Films With Perpendicular Anisotropy, M. L. Yan, Ralph Skomski, A. Kashyap, L. Gao, Sy-Hwang Liou, and David J. Sellmyer

PDF

Magnetization Reversal and Giant Coercivity in Sm-Co/Cu-Ti Particulate Films, Jian Zhou, Arti Kashyap, Yi Liu, Ralph Skomski, and David J. Sellmyer

2003

PDF

Finite-temperature spin polarization in half-metallic ferromagnets, Peter A. Dowben and Ralph Skomski

PDF

Exchange Interactions and Curie Temperature of Y–Co Compounds, Arti Kashyap, Ralph Skomski, Renat F. Sabiryanov, Sitaram Jaswal, and David J. Sellmyer

PDF

Spin-wave modes in magnetic nanowires, Ralph Skomski, M. Chipara, and David J. Sellmyer

PDF

Exchange through nonmagnetic insulating matrix, Ralph Skomski, A. Kashyap, Y. Quiang, and David J. Sellmyer

PDF

Finite-Temperature Anisotropy of PtCo Magnets, Ralph Skomski, Arti Kashyap, and David J. Sellmyer

PDF

Equivalence of sweep-rate and magnetic-viscosity dynamics, Ralph Skomski, Roger D. Kirby, and David J. Sellmyer

PDF

Spin structure at nanojunctions and constrictions, Ralph Skomski and David J. Sellmyer

PDF

CoPt hard magnetic nanoparticle films synthesized by high temperature chemical reduction , Yucheng Sui, L. Yue, Ralph Skomski, X.Z. Li, J. Zhou, and David J. Sellmyer

PDF

Magnetic transitions in disordered GdAl2, D. S. Williams, Paul M. Shand, Thomas M. Pekarek, Ralph Skomski, Valeri G. Petkov, and Diandra Leslie-Pelecky

PDF

Magnetic hysteresis of mechanically alloyed Sm–Co nanocrystalline powders, J. Zhou, Ralph Skomski, and David J. Sellmyer

2002

PDF

Magnetic force microscopy observations of the magnetic behavior in Co–C nanodot arrays, L. Gao, Sy_Hwang Liou, M. Zheng, Ralph Skomski, M. L. Yan, David J. Sellmyer, and N.I. Polushkin

PDF

Magnetic force microscopy observations of the magnetic behavior in Co–C nanodot arrays, L. Gao, Sy_Hwang Liou, M. Zheng, Ralph Skomski, M.L. Yan, David J. Sellmyer, and N.I. Polushkin

PDF

Exact nucleation modes in arrays of magnetic particles, Ralph Skomski

PDF

Exchange-controlled magnetic anisotropy, Ralph Skomski

PDF

The finite-temperature densities of states for half-metallic ferromagnets, Ralph Skomski and Peter A. Dowben

PDF

Structure and magnetic properties of ferromagnetic nanowires in self-assembled arrays, H. Zeng, Ralph Skomski, L. Menon, Yi Liu, S. Bandyopadhyay, and David J. Sellmyer

PDF

Permanent-Magnet Properties of Thermally Processed FePt and FePt–Fe Multilayer Films, Jian Zhou, Ralph Skomski, Xingzhong Li, Wei Tang, George C. Hadjipanayis, and David J. Sellmyer

2001

PDF

High-temperature magnetic properties of mechanically alloyed SmCo 5 and YCo5 magnets, I.A. Al-Omari, Ralph Skomski, R.A. Thomas, D. Leslie-Pelecky, and David J. Sellmyer

PDF

Layer-resolved spin polarization in Sb overlayers on NiMnSb, Ralph Skomski, T. Komesu, C.N. Borca, H.-K. Jeong, Peter A. Dowben, D. Ristoiu, and J.P. Nozie´res

PDF

Cooperative freezing in spin glasses and magnetic nanostructures, Ralph Skomski and Diandra Leslie-Pelecky

PDF

Cooperative magnetism and the Preisach model, Ralph Skomski and David J. Sellmyer

PDF

Grain-boundary micromagnetism, Ralph Skomski, H. Zeng, and David J. Sellmyer

PDF

Magnetic nanodot arrays produced by direct laser interference lithography, M. Zheng, M. Yu, Yi Liu, Ralph Skomski, Sy_Hwang Liou, David J. Sellmyer, V.N. Petryakov, Yu K. Verevkin, N.I. Polushkin, and N. N. Salashchenko

PDF

Ferromagnetic Co-C nanodot arrays produced by direct interferometric laser annealing, M. Zheng, M. Yu, Yi Liu, Ralph Skomski, David J. Sellmyer, V.N. Petryakov, Yu. K. Verevkin, Nikolay Polushkin, and N.N. Salashchenko

PDF

Coercivity of titanium-substituted high-temperature permanent magnets, Jian Zhou, Ralph Skomski, and David J. Sellmyer

2000

PDF

Temperature dependence of magnetic hysteresis of RCox:Co nanocomposites (R=Pr and Sm), J.P. Liu, Ralph Skomski, Yi Liu, and David J. Sellmyer

PDF

Hysteresis-loop overskewing in the light of a novel nucleation mode, Ralph Skomski, J.P. Liu, and David J. Sellmyer

PDF

Curie temperature of multiphase nanostructures, Ralph Skomski and David J. Sellmyer

PDF

Magnetic localization in transition-metal nanowires, Ralph Skomski, H. Zeng, M. Zheng, and David J. Sellmyer

PDF

Magnetic properties of self-assembled Co nanowires of varying length and diameter, H. Zeng, M. Zheng, Ralph Skomski, David J. Sellmyer, Yi Liu, L. Menon, and S. Bandyopadhyay

PDF

Sm–Co–Cu–Ti high-temperature permanent magnets, Jian Zhou, Ralph Skomski, C. Chen, G.C. Hadjipanayis, and David J. Sellmyer

1999

PDF

High Energy Products in Exchange-Coupled Nanocomposite Films, J.P. Liu, Yi Liu, Ralph Skomski, and David J. Sellmyer

PDF

Magnetic hardening in SmCox–Co multilayers and nanocomposites, J.P. Liu, Yi Liu, Ralph Skomski, and David J. Sellmyer

PDF

RKKY interactions between nanomagnets of arbitrary shape, Ralph Skomski

PDF

Activation entropy, activation energy, and magnetic viscosity, Ralph Skomski, Roger D. Kirby, and David J. Sellmyer

PDF

Quasicoherent nucleation mode in two-phase nanomagnets, Ralph Skomski, J.P. Liu, and David J. Sellmyer

1998

PDF

Higher-order and next-nearest-neighbor Néel anisotropies , Y.T. Millev, Ralph Skomski, and J. Kirschner

PDF

Finite-temperature behavior of anisotropic two-sublattice magnets, Ralph Skomski

PDF

Magnetoelectric Néel anisotropies, Ralph Skomski

PDF

Micromagnetic localization, Ralph Skomski

PDF

Micromagnetics of ultrathin films with perpendicular magnetic anisotropy , Ralph Skomski, H.-P. Oepen, and J. Kirschner

PDF

Unidirectional anisotropy in ultrathin transition-metal films , Ralph Skomski, H.-P. Oepen, and J. Kirschner

PDF

Iron and nickel surface and interface anisotropies, Ralph Skomski, D. Sander, C. Schmidthals, A. Enders, and J. Kirschner

PDF

Immobilization diffusion in R2Fe17 nitrides, Ralph Skomski and S. Wirth

PDF

Hydrogen in R2Fe17 intermetallic compounds: Structural, thermodynamic, and magnetic properties, S. Wirth, Ralph Skomski, and J.M.D. Coey

1997

PDF

Magnetism and morphology of Fe/Cu(111) films below two-dimensional percolation, J. Shen, Ralph Skomski, M. Klaua, H. Jenniches, S. Sundar Manoharan, and J. Kirschner

PDF

Magnetism in one dimension: Fe on Cu(111) , J. Shen, Ralph Skomski, M. Klaua, H. Jenniches, S. Sundar Manoharan, and J. Kirschner

PDF

Domain-wall curvature and coercivity in pinning type Sm–Co magnets, Ralph Skomski

PDF

Superparamagnetic ultrathin films, Ralph Skomski, D. Sander, J. Shen, and J. Kirschner

1996

PDF

High coercive Field and Film Stress for epitaxial Monolayers of Fe on W(110), D. Sander, A. Enders, Ralph Skomski, and J. Kirschner

PDF

Film Stress and Domain Wall Pinning in Sesquilayer Iron Films on W(110), D. Sander, Ralph Skomski, C. Schmidthals, A. Enders, and J. Kirschner

PDF

The Itinerant Limit of Metallic Anisotropy, Ralph Skomski

PDF

An Effective-Viscosity Description of Domain-Wall Motion in Magnetic Thin Films with Perpendicular Anisotropy, Ralph Skomski, J. Giergiel, and J. Kirschner

PDF

Is there Spin-Glass Exchange in Ultrathin Fe(110) Films ?, Ralph Skomski, D. Sander, A. Enders, and J. Kirschner

PDF

Determination of crystal-field parameters of Sm2Fe17N3 and Sm2Fe17C3, S. Wirth, M. Wolf, K.H. Muller, Ralph Skomski, S. Brennan, and J.M.D. Coey

1994

PDF

NON-EQUILIBRIUM GAS-PHASE NITROGENATION, S. Brennan, Ralph Skomski, and J.M.D. Coey

PDF

Magnetoresistance in Nanostructured Co-Ag Prepared by Mechanical- Alloying, J.M.D. Coey, A.J. Fagan, Ralph Skomski, J. Gregg, K. Ounadjela, and S.M. Thompson

PDF

Magnetoresistance in Nanostructured Co-Ag Prepared by Mechanical- Alloying, J.M.D. Coey, A.J. Fagan, Ralph Skomski, J. Gregg, K. Ounadjela, and S.M. Thompson

PDF

Aligned two-phase magnets: Permanent magnetism of the future? (invited), Ralph Skomski

PDF

Exchange Coupling and Energy Product in Random Two- Phase Aligned Magnets, Ralph Skomski and J.M.D. Coey

1993

PDF

New Magnets from Interstitial Intermetallics, J.M.D. Coey and Ralph Skomski

PDF

Characterization, transport, and magnetic properties of Co/Pd multilayers produced by pulsed laser deposition, M. Enrech, Ralph Skomski, J.M.D. Coey, and J.G. Lunney

PDF

Giant energy product in nanostructured two-phase magnets , Ralph Skomski and J.M.D. Coey