Rheology and ultrasonic properties of metallic glass-forming liquids (2009)
Demetriou, Marios D., Johnson, William L., Samwer, Konrad
The flow of metallic glass-forming liquids can be modeled as configurational hopping between inherent states across energy barriers that are assumed to be on average sinusoidal. Such treatment gives...
Coarse-grained description of localized inelastic deformation in amorphous metals (2009)
Demetriou, Marios D., Johnson, William L., Samwer, Konrad
The sequence of shear transformation events that lead to a shear band transition in amorphous metals is described by a spatially random coarse-grained model calibrated to obey the thermodynamic...
Hachenberg, Jörg, Bedorf, Dennis, Samwer, Konrad, Richert, Ranko, Kahl, Annelen, Demetriou, Marios D., ...
This paper provides evidence that the physical aging of deeply and rapidly quenched metallic glasses is promoted by the Johari–Goldstein slow beta relaxation, resulting in a significant...
Dependence of Magnetic Anisotropy and Magnetoresistance of Ni81Fe19-Films on Annealing (2007)
Tilmann Lorenz, Andrea Käufler, Yuansu Luo, Michael Moske, Konrad Samwer
Permalloy (Py:Ni81Fe19) exhibits an anisotropic magnetoresistance (AMR) which is very often used to read magnetic signals from storage devices. Py-films of thickness 20nm were prepared by...
Molecular Dynamics Simulation on Plastic Deformation of Metallic Nanowires (2007)
H. Ikeda, Y. Qi, T. Cagin, K. Samwer, W. Johnson, W. Goddard Iii, ...
We have studied the initial stage of plastic deformation behavior of metallic nanowire of pure nickel, by using molecular dynamics methods. In these simulations, we applied uniform strain along...
Anelastic to Plastic Transition in Metallic Glass-Forming Liquids (2007)
Harmon, John S., Demetriou, Marios D., Johnson, William L., Samwer, Konrad
The configurational properties associated with the transition from anelasticity to plasticity in a transiently deforming metallic glass-forming liquid are studied. The data reveal that the underlying...
A novel spin transfer torque effect in Ag2Co granular films (2007)
Luo, Yuansu, Esseling, Markus, Münzenberg, Markus, Samwer, Konrad
Abstract: We studied a spin transfer torque (STT) effect in Ag2Co granular films, induced by a high current density 108 - 9 A cm- 2 injected via a point contact. The system consists of single domain...
Strong configurational dependence of elastic properties for a binary model metallic glass (2006)
Duan, Gang, Lind, Mary Laura, Demetriou, Marios D., Johnson, William L., Çağin, Tahir, ...
In this work, the strong dependence of elastic properties on configurational changes in a Cu–Zr binary metallic glass assessed by molecular dynamics simulations is reported. By directly evaluating...
Cooperative Shear Model for the Rheology of Glass-Forming Metallic Liquids (2006)
Demetriou, Marios D., Harmon, John S., Tao, Min, Duan, Gang, Samwer, Konrad, Johnson, William L.
A rheological law based on the concept of cooperatively sheared flow zones is presented, in which the effective thermodynamic state variable controlling flow is identified to be the...
Exploring lattice effects on transport properties in La0.7Sr0.3MnO3/Al2O3 superlattices (2006)
Abstract: Superlattice modulation and interfacial dilatation in manganite/alumina multilayers were used to explore lattice effects on transport behaviour. Epitaxial growth and high quality of...
Mayr, Stefan G., Moske, Michael, Samwer, Konrad, Taylor, Maggie E., Atwater, Harry A.
Surface morphology evolution of thin films generated by physical and pulsed-laser deposition depending on the incident particle energy and the pulse rate is investigated using a continuum growth...
Strain Rate Induced Amorphization in Metallic Nanowires (1999)
Ikeda, Hideyuki, Qi, Yue, Çağin, Tahir, Samwer, Konrad, Johnson, William L.
Using molecular dynamics simulations with a many-body force field, we studied the deformation of single crystal Ni and NiCu random alloy nanowires subjected to uniform strain rates but kept at 300 K....
Strain Rate Induced Amorphization in Metallic Nanowires (1999)
H. Ikeda, Y. Qi, T. Cagin, K. Samwer, W. L. Johnson, W. A. Goddard, ...
Using molecular dynamics simulations with a many-body force field, we studied the deformation of metal alloy nanowires subjected to various strain rates. For all strain rates, the Ni nanowire is...